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-rw-r--r--activerecord/lib/active_record/aggregations.rb1
-rw-r--r--activerecord/lib/active_record/association_relation.rb1
-rw-r--r--activerecord/lib/active_record/associations.rb1
-rw-r--r--activerecord/lib/active_record/associations/alias_tracker.rb1
-rw-r--r--activerecord/lib/active_record/associations/association.rb1
-rw-r--r--activerecord/lib/active_record/associations/association_scope.rb1
-rw-r--r--activerecord/lib/active_record/associations/belongs_to_association.rb1
-rw-r--r--activerecord/lib/active_record/associations/belongs_to_polymorphic_association.rb1
-rw-r--r--activerecord/lib/active_record/associations/builder/association.rb1
-rw-r--r--activerecord/lib/active_record/associations/builder/belongs_to.rb1
-rw-r--r--activerecord/lib/active_record/associations/builder/collection_association.rb1
-rw-r--r--activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb1
-rw-r--r--activerecord/lib/active_record/associations/builder/has_many.rb1
-rw-r--r--activerecord/lib/active_record/associations/builder/has_one.rb1
-rw-r--r--activerecord/lib/active_record/associations/builder/singular_association.rb1
-rw-r--r--activerecord/lib/active_record/associations/collection_association.rb1
-rw-r--r--activerecord/lib/active_record/associations/collection_proxy.rb1
-rw-r--r--activerecord/lib/active_record/associations/foreign_association.rb1
-rw-r--r--activerecord/lib/active_record/associations/has_many_association.rb1
-rw-r--r--activerecord/lib/active_record/associations/has_many_through_association.rb1
-rw-r--r--activerecord/lib/active_record/associations/has_one_association.rb1
-rw-r--r--activerecord/lib/active_record/associations/has_one_through_association.rb1
-rw-r--r--activerecord/lib/active_record/associations/join_dependency.rb1
-rw-r--r--activerecord/lib/active_record/associations/join_dependency/join_association.rb1
-rw-r--r--activerecord/lib/active_record/associations/join_dependency/join_base.rb1
-rw-r--r--activerecord/lib/active_record/associations/join_dependency/join_part.rb1
-rw-r--r--activerecord/lib/active_record/associations/preloader.rb1
-rw-r--r--activerecord/lib/active_record/associations/preloader/association.rb1
-rw-r--r--activerecord/lib/active_record/associations/preloader/belongs_to.rb1
-rw-r--r--activerecord/lib/active_record/associations/preloader/collection_association.rb1
-rw-r--r--activerecord/lib/active_record/associations/preloader/has_many.rb1
-rw-r--r--activerecord/lib/active_record/associations/preloader/has_many_through.rb1
-rw-r--r--activerecord/lib/active_record/associations/preloader/has_one.rb1
-rw-r--r--activerecord/lib/active_record/associations/preloader/has_one_through.rb1
-rw-r--r--activerecord/lib/active_record/associations/preloader/singular_association.rb1
-rw-r--r--activerecord/lib/active_record/associations/preloader/through_association.rb1
-rw-r--r--activerecord/lib/active_record/associations/singular_association.rb1
-rw-r--r--activerecord/lib/active_record/associations/through_association.rb1
-rw-r--r--activerecord/lib/active_record/attribute.rb1
-rw-r--r--activerecord/lib/active_record/attribute/user_provided_default.rb1
-rw-r--r--activerecord/lib/active_record/attribute_assignment.rb1
-rw-r--r--activerecord/lib/active_record/attribute_decorators.rb1
-rw-r--r--activerecord/lib/active_record/attribute_methods.rb1
-rw-r--r--activerecord/lib/active_record/attribute_methods/before_type_cast.rb1
-rw-r--r--activerecord/lib/active_record/attribute_methods/primary_key.rb1
-rw-r--r--activerecord/lib/active_record/attribute_methods/query.rb1
-rw-r--r--activerecord/lib/active_record/attribute_methods/read.rb1
-rw-r--r--activerecord/lib/active_record/attribute_methods/serialization.rb1
-rw-r--r--activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb1
-rw-r--r--activerecord/lib/active_record/attribute_methods/write.rb1
-rw-r--r--activerecord/lib/active_record/attribute_mutation_tracker.rb1
-rw-r--r--activerecord/lib/active_record/attribute_set.rb1
-rw-r--r--activerecord/lib/active_record/attribute_set/builder.rb1
-rw-r--r--activerecord/lib/active_record/attribute_set/yaml_encoder.rb1
-rw-r--r--activerecord/lib/active_record/attributes.rb1
-rw-r--r--activerecord/lib/active_record/autosave_association.rb1
-rw-r--r--activerecord/lib/active_record/base.rb1
-rw-r--r--activerecord/lib/active_record/callbacks.rb1
-rw-r--r--activerecord/lib/active_record/coders/json.rb1
-rw-r--r--activerecord/lib/active_record/coders/yaml_column.rb1
-rw-r--r--activerecord/lib/active_record/collection_cache_key.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/quoting.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/savepoints.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/schema_creation.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/schema_dumper.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/transaction.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract_adapter.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/column.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/connection_specification.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/determine_if_preparable_visitor.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/mysql/column.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/mysql/explain_pretty_printer.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/mysql/quoting.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/mysql/schema_creation.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/mysql/schema_definitions.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/mysql/type_metadata.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/column.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/explain_pretty_printer.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/bit.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/bit_varying.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/bytea.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/cidr.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/date_time.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/decimal.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/enum.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/hstore.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/inet.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/json.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/jsonb.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/legacy_point.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/money.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/oid.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/point.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/range.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/specialized_string.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/type_map_initializer.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/uuid.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/vector.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/xml.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/referential_integrity.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/schema_creation.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/schema_definitions.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/schema_dumper.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/type_metadata.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/utils.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/schema_cache.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/sql_type_metadata.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/sqlite3/explain_pretty_printer.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/sqlite3/quoting.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/sqlite3/schema_creation.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/sqlite3/schema_definitions.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/sqlite3/schema_dumper.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/sqlite3/schema_statements.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb1
-rw-r--r--activerecord/lib/active_record/connection_adapters/statement_pool.rb1
-rw-r--r--activerecord/lib/active_record/connection_handling.rb1
-rw-r--r--activerecord/lib/active_record/core.rb1
-rw-r--r--activerecord/lib/active_record/counter_cache.rb1
-rw-r--r--activerecord/lib/active_record/define_callbacks.rb1
-rw-r--r--activerecord/lib/active_record/dynamic_matchers.rb1
-rw-r--r--activerecord/lib/active_record/enum.rb1
-rw-r--r--activerecord/lib/active_record/errors.rb1
-rw-r--r--activerecord/lib/active_record/explain.rb1
-rw-r--r--activerecord/lib/active_record/explain_registry.rb1
-rw-r--r--activerecord/lib/active_record/explain_subscriber.rb1
-rw-r--r--activerecord/lib/active_record/fixture_set/file.rb1
-rw-r--r--activerecord/lib/active_record/fixtures.rb1
-rw-r--r--activerecord/lib/active_record/gem_version.rb1
-rw-r--r--activerecord/lib/active_record/inheritance.rb1
-rw-r--r--activerecord/lib/active_record/integration.rb1
-rw-r--r--activerecord/lib/active_record/internal_metadata.rb1
-rw-r--r--activerecord/lib/active_record/legacy_yaml_adapter.rb1
-rw-r--r--activerecord/lib/active_record/locking/optimistic.rb1
-rw-r--r--activerecord/lib/active_record/locking/pessimistic.rb1
-rw-r--r--activerecord/lib/active_record/log_subscriber.rb1
-rw-r--r--activerecord/lib/active_record/migration.rb1
-rw-r--r--activerecord/lib/active_record/migration/command_recorder.rb1
-rw-r--r--activerecord/lib/active_record/migration/compatibility.rb1
-rw-r--r--activerecord/lib/active_record/migration/join_table.rb1
-rw-r--r--activerecord/lib/active_record/model_schema.rb1
-rw-r--r--activerecord/lib/active_record/nested_attributes.rb1
-rw-r--r--activerecord/lib/active_record/no_touching.rb1
-rw-r--r--activerecord/lib/active_record/null_relation.rb1
-rw-r--r--activerecord/lib/active_record/persistence.rb1
-rw-r--r--activerecord/lib/active_record/query_cache.rb1
-rw-r--r--activerecord/lib/active_record/querying.rb1
-rw-r--r--activerecord/lib/active_record/railtie.rb1
-rw-r--r--activerecord/lib/active_record/railties/console_sandbox.rb1
-rw-r--r--activerecord/lib/active_record/railties/controller_runtime.rb1
-rw-r--r--activerecord/lib/active_record/railties/databases.rake1
-rw-r--r--activerecord/lib/active_record/railties/jdbcmysql_error.rb1
-rw-r--r--activerecord/lib/active_record/readonly_attributes.rb1
-rw-r--r--activerecord/lib/active_record/reflection.rb1
-rw-r--r--activerecord/lib/active_record/relation.rb1
-rw-r--r--activerecord/lib/active_record/relation/batches.rb1
-rw-r--r--activerecord/lib/active_record/relation/batches/batch_enumerator.rb1
-rw-r--r--activerecord/lib/active_record/relation/calculations.rb1
-rw-r--r--activerecord/lib/active_record/relation/delegation.rb1
-rw-r--r--activerecord/lib/active_record/relation/finder_methods.rb1
-rw-r--r--activerecord/lib/active_record/relation/from_clause.rb1
-rw-r--r--activerecord/lib/active_record/relation/merger.rb1
-rw-r--r--activerecord/lib/active_record/relation/predicate_builder.rb1
-rw-r--r--activerecord/lib/active_record/relation/predicate_builder/array_handler.rb1
-rw-r--r--activerecord/lib/active_record/relation/predicate_builder/association_query_value.rb1
-rw-r--r--activerecord/lib/active_record/relation/predicate_builder/base_handler.rb1
-rw-r--r--activerecord/lib/active_record/relation/predicate_builder/basic_object_handler.rb1
-rw-r--r--activerecord/lib/active_record/relation/predicate_builder/polymorphic_array_value.rb1
-rw-r--r--activerecord/lib/active_record/relation/predicate_builder/range_handler.rb1
-rw-r--r--activerecord/lib/active_record/relation/predicate_builder/relation_handler.rb1
-rw-r--r--activerecord/lib/active_record/relation/query_attribute.rb1
-rw-r--r--activerecord/lib/active_record/relation/query_methods.rb1
-rw-r--r--activerecord/lib/active_record/relation/record_fetch_warning.rb1
-rw-r--r--activerecord/lib/active_record/relation/spawn_methods.rb1
-rw-r--r--activerecord/lib/active_record/relation/where_clause.rb1
-rw-r--r--activerecord/lib/active_record/relation/where_clause_factory.rb1
-rw-r--r--activerecord/lib/active_record/result.rb1
-rw-r--r--activerecord/lib/active_record/runtime_registry.rb1
-rw-r--r--activerecord/lib/active_record/sanitization.rb1
-rw-r--r--activerecord/lib/active_record/schema.rb1
-rw-r--r--activerecord/lib/active_record/schema_dumper.rb1
-rw-r--r--activerecord/lib/active_record/schema_migration.rb1
-rw-r--r--activerecord/lib/active_record/scoping.rb1
-rw-r--r--activerecord/lib/active_record/scoping/default.rb1
-rw-r--r--activerecord/lib/active_record/scoping/named.rb1
-rw-r--r--activerecord/lib/active_record/secure_token.rb1
-rw-r--r--activerecord/lib/active_record/serialization.rb1
-rw-r--r--activerecord/lib/active_record/statement_cache.rb1
-rw-r--r--activerecord/lib/active_record/store.rb1
-rw-r--r--activerecord/lib/active_record/suppressor.rb1
-rw-r--r--activerecord/lib/active_record/table_metadata.rb1
-rw-r--r--activerecord/lib/active_record/tasks/database_tasks.rb1
-rw-r--r--activerecord/lib/active_record/tasks/mysql_database_tasks.rb1
-rw-r--r--activerecord/lib/active_record/tasks/postgresql_database_tasks.rb1
-rw-r--r--activerecord/lib/active_record/tasks/sqlite_database_tasks.rb1
-rw-r--r--activerecord/lib/active_record/touch_later.rb1
-rw-r--r--activerecord/lib/active_record/transactions.rb1
-rw-r--r--activerecord/lib/active_record/translation.rb1
-rw-r--r--activerecord/lib/active_record/type.rb1
-rw-r--r--activerecord/lib/active_record/type/adapter_specific_registry.rb1
-rw-r--r--activerecord/lib/active_record/type/date.rb1
-rw-r--r--activerecord/lib/active_record/type/date_time.rb1
-rw-r--r--activerecord/lib/active_record/type/decimal_without_scale.rb1
-rw-r--r--activerecord/lib/active_record/type/hash_lookup_type_map.rb1
-rw-r--r--activerecord/lib/active_record/type/internal/timezone.rb1
-rw-r--r--activerecord/lib/active_record/type/json.rb1
-rw-r--r--activerecord/lib/active_record/type/serialized.rb1
-rw-r--r--activerecord/lib/active_record/type/text.rb1
-rw-r--r--activerecord/lib/active_record/type/time.rb1
-rw-r--r--activerecord/lib/active_record/type/type_map.rb1
-rw-r--r--activerecord/lib/active_record/type/unsigned_integer.rb1
-rw-r--r--activerecord/lib/active_record/type_caster.rb1
-rw-r--r--activerecord/lib/active_record/type_caster/connection.rb1
-rw-r--r--activerecord/lib/active_record/type_caster/map.rb1
-rw-r--r--activerecord/lib/active_record/validations.rb1
-rw-r--r--activerecord/lib/active_record/validations/absence.rb1
-rw-r--r--activerecord/lib/active_record/validations/associated.rb1
-rw-r--r--activerecord/lib/active_record/validations/length.rb1
-rw-r--r--activerecord/lib/active_record/validations/presence.rb1
-rw-r--r--activerecord/lib/active_record/validations/uniqueness.rb1
-rw-r--r--activerecord/lib/active_record/version.rb1
237 files changed, 237 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/aggregations.rb b/activerecord/lib/active_record/aggregations.rb
index 10cbd5429c..e0caad5381 100644
--- a/activerecord/lib/active_record/aggregations.rb
+++ b/activerecord/lib/active_record/aggregations.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# See ActiveRecord::Aggregations::ClassMethods for documentation
module Aggregations
diff --git a/activerecord/lib/active_record/association_relation.rb b/activerecord/lib/active_record/association_relation.rb
index de2d03cd0b..a79112cb3b 100644
--- a/activerecord/lib/active_record/association_relation.rb
+++ b/activerecord/lib/active_record/association_relation.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class AssociationRelation < Relation
def initialize(klass, table, predicate_builder, association)
diff --git a/activerecord/lib/active_record/associations.rb b/activerecord/lib/active_record/associations.rb
index f05a122544..13db82b2aa 100644
--- a/activerecord/lib/active_record/associations.rb
+++ b/activerecord/lib/active_record/associations.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/enumerable"
require "active_support/core_ext/string/conversions"
require "active_support/core_ext/module/remove_method"
diff --git a/activerecord/lib/active_record/associations/alias_tracker.rb b/activerecord/lib/active_record/associations/alias_tracker.rb
index 104de4f69d..eb81ba5ff6 100644
--- a/activerecord/lib/active_record/associations/alias_tracker.rb
+++ b/activerecord/lib/active_record/associations/alias_tracker.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/string/conversions"
module ActiveRecord
diff --git a/activerecord/lib/active_record/associations/association.rb b/activerecord/lib/active_record/associations/association.rb
index 1138ae3462..0fca4467f9 100644
--- a/activerecord/lib/active_record/associations/association.rb
+++ b/activerecord/lib/active_record/associations/association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/array/wrap"
module ActiveRecord
diff --git a/activerecord/lib/active_record/associations/association_scope.rb b/activerecord/lib/active_record/associations/association_scope.rb
index 6ef225b725..900ebda2bb 100644
--- a/activerecord/lib/active_record/associations/association_scope.rb
+++ b/activerecord/lib/active_record/associations/association_scope.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
class AssociationScope #:nodoc:
diff --git a/activerecord/lib/active_record/associations/belongs_to_association.rb b/activerecord/lib/active_record/associations/belongs_to_association.rb
index 0e61dbfb00..b8d3173dc7 100644
--- a/activerecord/lib/active_record/associations/belongs_to_association.rb
+++ b/activerecord/lib/active_record/associations/belongs_to_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record Belongs To Association
module Associations
diff --git a/activerecord/lib/active_record/associations/belongs_to_polymorphic_association.rb b/activerecord/lib/active_record/associations/belongs_to_polymorphic_association.rb
index b710cf6bdb..15aae53e80 100644
--- a/activerecord/lib/active_record/associations/belongs_to_polymorphic_association.rb
+++ b/activerecord/lib/active_record/associations/belongs_to_polymorphic_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record Belongs To Polymorphic Association
module Associations
diff --git a/activerecord/lib/active_record/associations/builder/association.rb b/activerecord/lib/active_record/associations/builder/association.rb
index d0534056d9..df8d77a5d1 100644
--- a/activerecord/lib/active_record/associations/builder/association.rb
+++ b/activerecord/lib/active_record/associations/builder/association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
# This is the parent Association class which defines the variables
# used by all associations.
#
diff --git a/activerecord/lib/active_record/associations/builder/belongs_to.rb b/activerecord/lib/active_record/associations/builder/belongs_to.rb
index 2b9dd8aae8..7c2cc61ecd 100644
--- a/activerecord/lib/active_record/associations/builder/belongs_to.rb
+++ b/activerecord/lib/active_record/associations/builder/belongs_to.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord::Associations::Builder # :nodoc:
class BelongsTo < SingularAssociation #:nodoc:
def self.macro
diff --git a/activerecord/lib/active_record/associations/builder/collection_association.rb b/activerecord/lib/active_record/associations/builder/collection_association.rb
index edeb6491bd..4de3371d54 100644
--- a/activerecord/lib/active_record/associations/builder/collection_association.rb
+++ b/activerecord/lib/active_record/associations/builder/collection_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
# This class is inherited by the has_many and has_many_and_belongs_to_many association classes
require "active_record/associations"
diff --git a/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb b/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb
index 6b71826431..c3e62c1a3d 100644
--- a/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb
+++ b/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord::Associations::Builder # :nodoc:
class HasAndBelongsToMany # :nodoc:
class JoinTableResolver # :nodoc:
diff --git a/activerecord/lib/active_record/associations/builder/has_many.rb b/activerecord/lib/active_record/associations/builder/has_many.rb
index 7864d4c536..3e83fad619 100644
--- a/activerecord/lib/active_record/associations/builder/has_many.rb
+++ b/activerecord/lib/active_record/associations/builder/has_many.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord::Associations::Builder # :nodoc:
class HasMany < CollectionAssociation #:nodoc:
def self.macro
diff --git a/activerecord/lib/active_record/associations/builder/has_one.rb b/activerecord/lib/active_record/associations/builder/has_one.rb
index 4de846d12b..66135bbc2d 100644
--- a/activerecord/lib/active_record/associations/builder/has_one.rb
+++ b/activerecord/lib/active_record/associations/builder/has_one.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord::Associations::Builder # :nodoc:
class HasOne < SingularAssociation #:nodoc:
def self.macro
diff --git a/activerecord/lib/active_record/associations/builder/singular_association.rb b/activerecord/lib/active_record/associations/builder/singular_association.rb
index 7732b63af6..3a154ba25f 100644
--- a/activerecord/lib/active_record/associations/builder/singular_association.rb
+++ b/activerecord/lib/active_record/associations/builder/singular_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
# This class is inherited by the has_one and belongs_to association classes
module ActiveRecord::Associations::Builder # :nodoc:
diff --git a/activerecord/lib/active_record/associations/collection_association.rb b/activerecord/lib/active_record/associations/collection_association.rb
index bbf3dbb75e..f73b0b90cf 100644
--- a/activerecord/lib/active_record/associations/collection_association.rb
+++ b/activerecord/lib/active_record/associations/collection_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
# = Active Record Association Collection
diff --git a/activerecord/lib/active_record/associations/collection_proxy.rb b/activerecord/lib/active_record/associations/collection_proxy.rb
index d77fcaf668..6ccdaebbe3 100644
--- a/activerecord/lib/active_record/associations/collection_proxy.rb
+++ b/activerecord/lib/active_record/associations/collection_proxy.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
# Association proxies in Active Record are middlemen between the object that
diff --git a/activerecord/lib/active_record/associations/foreign_association.rb b/activerecord/lib/active_record/associations/foreign_association.rb
index 3ceec0ee46..1fb6ff7bff 100644
--- a/activerecord/lib/active_record/associations/foreign_association.rb
+++ b/activerecord/lib/active_record/associations/foreign_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord::Associations
module ForeignAssociation # :nodoc:
def foreign_key_present?
diff --git a/activerecord/lib/active_record/associations/has_many_association.rb b/activerecord/lib/active_record/associations/has_many_association.rb
index 10ca0e47ff..4e0c89791e 100644
--- a/activerecord/lib/active_record/associations/has_many_association.rb
+++ b/activerecord/lib/active_record/associations/has_many_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record Has Many Association
module Associations
diff --git a/activerecord/lib/active_record/associations/has_many_through_association.rb b/activerecord/lib/active_record/associations/has_many_through_association.rb
index 2fd20b4368..c4ed91aeca 100644
--- a/activerecord/lib/active_record/associations/has_many_through_association.rb
+++ b/activerecord/lib/active_record/associations/has_many_through_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record Has Many Through Association
module Associations
diff --git a/activerecord/lib/active_record/associations/has_one_association.rb b/activerecord/lib/active_record/associations/has_one_association.rb
index 8458253ff8..a78c1b1d32 100644
--- a/activerecord/lib/active_record/associations/has_one_association.rb
+++ b/activerecord/lib/active_record/associations/has_one_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record Has One Association
module Associations
diff --git a/activerecord/lib/active_record/associations/has_one_through_association.rb b/activerecord/lib/active_record/associations/has_one_through_association.rb
index 1183bdf6f4..1e8b2244d9 100644
--- a/activerecord/lib/active_record/associations/has_one_through_association.rb
+++ b/activerecord/lib/active_record/associations/has_one_through_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record Has One Through Association
module Associations
diff --git a/activerecord/lib/active_record/associations/join_dependency.rb b/activerecord/lib/active_record/associations/join_dependency.rb
index bc66194aef..575051c45a 100644
--- a/activerecord/lib/active_record/associations/join_dependency.rb
+++ b/activerecord/lib/active_record/associations/join_dependency.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
class JoinDependency # :nodoc:
diff --git a/activerecord/lib/active_record/associations/join_dependency/join_association.rb b/activerecord/lib/active_record/associations/join_dependency/join_association.rb
index 005410d598..5df23e92ca 100644
--- a/activerecord/lib/active_record/associations/join_dependency/join_association.rb
+++ b/activerecord/lib/active_record/associations/join_dependency/join_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/associations/join_dependency/join_part"
module ActiveRecord
diff --git a/activerecord/lib/active_record/associations/join_dependency/join_base.rb b/activerecord/lib/active_record/associations/join_dependency/join_base.rb
index fca20514d1..aa02c5f056 100644
--- a/activerecord/lib/active_record/associations/join_dependency/join_base.rb
+++ b/activerecord/lib/active_record/associations/join_dependency/join_base.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/associations/join_dependency/join_part"
module ActiveRecord
diff --git a/activerecord/lib/active_record/associations/join_dependency/join_part.rb b/activerecord/lib/active_record/associations/join_dependency/join_part.rb
index 80c9fde5d1..0604333f30 100644
--- a/activerecord/lib/active_record/associations/join_dependency/join_part.rb
+++ b/activerecord/lib/active_record/associations/join_dependency/join_part.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
class JoinDependency # :nodoc:
diff --git a/activerecord/lib/active_record/associations/preloader.rb b/activerecord/lib/active_record/associations/preloader.rb
index 208d1b2670..130494f712 100644
--- a/activerecord/lib/active_record/associations/preloader.rb
+++ b/activerecord/lib/active_record/associations/preloader.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
# Implements the details of eager loading of Active Record associations.
diff --git a/activerecord/lib/active_record/associations/preloader/association.rb b/activerecord/lib/active_record/associations/preloader/association.rb
index 63ef3f2d8c..6a8425c989 100644
--- a/activerecord/lib/active_record/associations/preloader/association.rb
+++ b/activerecord/lib/active_record/associations/preloader/association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
class Preloader
diff --git a/activerecord/lib/active_record/associations/preloader/belongs_to.rb b/activerecord/lib/active_record/associations/preloader/belongs_to.rb
index c20145770f..ee7be18d15 100644
--- a/activerecord/lib/active_record/associations/preloader/belongs_to.rb
+++ b/activerecord/lib/active_record/associations/preloader/belongs_to.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
class Preloader
diff --git a/activerecord/lib/active_record/associations/preloader/collection_association.rb b/activerecord/lib/active_record/associations/preloader/collection_association.rb
index 26690bf16d..59c0bc4d8e 100644
--- a/activerecord/lib/active_record/associations/preloader/collection_association.rb
+++ b/activerecord/lib/active_record/associations/preloader/collection_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
class Preloader
diff --git a/activerecord/lib/active_record/associations/preloader/has_many.rb b/activerecord/lib/active_record/associations/preloader/has_many.rb
index 20df1cc19a..197f561b95 100644
--- a/activerecord/lib/active_record/associations/preloader/has_many.rb
+++ b/activerecord/lib/active_record/associations/preloader/has_many.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
class Preloader
diff --git a/activerecord/lib/active_record/associations/preloader/has_many_through.rb b/activerecord/lib/active_record/associations/preloader/has_many_through.rb
index 2029871f39..3bd561c187 100644
--- a/activerecord/lib/active_record/associations/preloader/has_many_through.rb
+++ b/activerecord/lib/active_record/associations/preloader/has_many_through.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
class Preloader
diff --git a/activerecord/lib/active_record/associations/preloader/has_one.rb b/activerecord/lib/active_record/associations/preloader/has_one.rb
index c4add621ca..d6254d8c56 100644
--- a/activerecord/lib/active_record/associations/preloader/has_one.rb
+++ b/activerecord/lib/active_record/associations/preloader/has_one.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
class Preloader
diff --git a/activerecord/lib/active_record/associations/preloader/has_one_through.rb b/activerecord/lib/active_record/associations/preloader/has_one_through.rb
index f063f85574..512ca82005 100644
--- a/activerecord/lib/active_record/associations/preloader/has_one_through.rb
+++ b/activerecord/lib/active_record/associations/preloader/has_one_through.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
class Preloader
diff --git a/activerecord/lib/active_record/associations/preloader/singular_association.rb b/activerecord/lib/active_record/associations/preloader/singular_association.rb
index 5c5828262e..5583c7d79c 100644
--- a/activerecord/lib/active_record/associations/preloader/singular_association.rb
+++ b/activerecord/lib/active_record/associations/preloader/singular_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
class Preloader
diff --git a/activerecord/lib/active_record/associations/preloader/through_association.rb b/activerecord/lib/active_record/associations/preloader/through_association.rb
index 34587fd3f5..8e12afc695 100644
--- a/activerecord/lib/active_record/associations/preloader/through_association.rb
+++ b/activerecord/lib/active_record/associations/preloader/through_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
class Preloader
diff --git a/activerecord/lib/active_record/associations/singular_association.rb b/activerecord/lib/active_record/associations/singular_association.rb
index f8bbe4c2ed..891caa44c3 100644
--- a/activerecord/lib/active_record/associations/singular_association.rb
+++ b/activerecord/lib/active_record/associations/singular_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Associations
class SingularAssociation < Association #:nodoc:
diff --git a/activerecord/lib/active_record/associations/through_association.rb b/activerecord/lib/active_record/associations/through_association.rb
index 6b87993ba3..fd4c1a1e78 100644
--- a/activerecord/lib/active_record/associations/through_association.rb
+++ b/activerecord/lib/active_record/associations/through_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record Through Association
module Associations
diff --git a/activerecord/lib/active_record/attribute.rb b/activerecord/lib/active_record/attribute.rb
index 38281158d8..61e8d4d849 100644
--- a/activerecord/lib/active_record/attribute.rb
+++ b/activerecord/lib/active_record/attribute.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class Attribute # :nodoc:
class << self
diff --git a/activerecord/lib/active_record/attribute/user_provided_default.rb b/activerecord/lib/active_record/attribute/user_provided_default.rb
index 57f8bbed76..b2e9ff9d99 100644
--- a/activerecord/lib/active_record/attribute/user_provided_default.rb
+++ b/activerecord/lib/active_record/attribute/user_provided_default.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/attribute"
module ActiveRecord
diff --git a/activerecord/lib/active_record/attribute_assignment.rb b/activerecord/lib/active_record/attribute_assignment.rb
index d0dfca0cac..39ba094b6d 100644
--- a/activerecord/lib/active_record/attribute_assignment.rb
+++ b/activerecord/lib/active_record/attribute_assignment.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_model/forbidden_attributes_protection"
module ActiveRecord
diff --git a/activerecord/lib/active_record/attribute_decorators.rb b/activerecord/lib/active_record/attribute_decorators.rb
index 5bc8527745..cb744d7b61 100644
--- a/activerecord/lib/active_record/attribute_decorators.rb
+++ b/activerecord/lib/active_record/attribute_decorators.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module AttributeDecorators # :nodoc:
extend ActiveSupport::Concern
diff --git a/activerecord/lib/active_record/attribute_methods.rb b/activerecord/lib/active_record/attribute_methods.rb
index 83c61fad19..b718da8555 100644
--- a/activerecord/lib/active_record/attribute_methods.rb
+++ b/activerecord/lib/active_record/attribute_methods.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/enumerable"
require "active_support/core_ext/string/filters"
require "mutex_m"
diff --git a/activerecord/lib/active_record/attribute_methods/before_type_cast.rb b/activerecord/lib/active_record/attribute_methods/before_type_cast.rb
index 115eb1ef3f..7cdb85e6cf 100644
--- a/activerecord/lib/active_record/attribute_methods/before_type_cast.rb
+++ b/activerecord/lib/active_record/attribute_methods/before_type_cast.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module AttributeMethods
# = Active Record Attribute Methods Before Type Cast
diff --git a/activerecord/lib/active_record/attribute_methods/primary_key.rb b/activerecord/lib/active_record/attribute_methods/primary_key.rb
index b9b2acff37..ca21eae7c1 100644
--- a/activerecord/lib/active_record/attribute_methods/primary_key.rb
+++ b/activerecord/lib/active_record/attribute_methods/primary_key.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "set"
module ActiveRecord
diff --git a/activerecord/lib/active_record/attribute_methods/query.rb b/activerecord/lib/active_record/attribute_methods/query.rb
index 10498f4322..db86ef428e 100644
--- a/activerecord/lib/active_record/attribute_methods/query.rb
+++ b/activerecord/lib/active_record/attribute_methods/query.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module AttributeMethods
module Query
diff --git a/activerecord/lib/active_record/attribute_methods/read.rb b/activerecord/lib/active_record/attribute_methods/read.rb
index fdc4bf6621..9d85af9424 100644
--- a/activerecord/lib/active_record/attribute_methods/read.rb
+++ b/activerecord/lib/active_record/attribute_methods/read.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module AttributeMethods
module Read
diff --git a/activerecord/lib/active_record/attribute_methods/serialization.rb b/activerecord/lib/active_record/attribute_methods/serialization.rb
index 4d9aff76cc..0f267e3a34 100644
--- a/activerecord/lib/active_record/attribute_methods/serialization.rb
+++ b/activerecord/lib/active_record/attribute_methods/serialization.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module AttributeMethods
module Serialization
diff --git a/activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb b/activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb
index 1f1efe8812..0c5f0a2fd1 100644
--- a/activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb
+++ b/activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module AttributeMethods
module TimeZoneConversion
diff --git a/activerecord/lib/active_record/attribute_methods/write.rb b/activerecord/lib/active_record/attribute_methods/write.rb
index 75c5a1a600..166cab7dd6 100644
--- a/activerecord/lib/active_record/attribute_methods/write.rb
+++ b/activerecord/lib/active_record/attribute_methods/write.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module AttributeMethods
module Write
diff --git a/activerecord/lib/active_record/attribute_mutation_tracker.rb b/activerecord/lib/active_record/attribute_mutation_tracker.rb
index 4de993e169..4b0d52742b 100644
--- a/activerecord/lib/active_record/attribute_mutation_tracker.rb
+++ b/activerecord/lib/active_record/attribute_mutation_tracker.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class AttributeMutationTracker # :nodoc:
OPTION_NOT_GIVEN = Object.new
diff --git a/activerecord/lib/active_record/attribute_set.rb b/activerecord/lib/active_record/attribute_set.rb
index 01f9d815d5..76de68ac70 100644
--- a/activerecord/lib/active_record/attribute_set.rb
+++ b/activerecord/lib/active_record/attribute_set.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/attribute_set/builder"
require "active_record/attribute_set/yaml_encoder"
diff --git a/activerecord/lib/active_record/attribute_set/builder.rb b/activerecord/lib/active_record/attribute_set/builder.rb
index 2f624d32af..9b75f185f7 100644
--- a/activerecord/lib/active_record/attribute_set/builder.rb
+++ b/activerecord/lib/active_record/attribute_set/builder.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/attribute"
module ActiveRecord
diff --git a/activerecord/lib/active_record/attribute_set/yaml_encoder.rb b/activerecord/lib/active_record/attribute_set/yaml_encoder.rb
index 899de14792..f3d726f53c 100644
--- a/activerecord/lib/active_record/attribute_set/yaml_encoder.rb
+++ b/activerecord/lib/active_record/attribute_set/yaml_encoder.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class AttributeSet
# Attempts to do more intelligent YAML dumping of an
diff --git a/activerecord/lib/active_record/attributes.rb b/activerecord/lib/active_record/attributes.rb
index 475b9beec4..0dceb417a5 100644
--- a/activerecord/lib/active_record/attributes.rb
+++ b/activerecord/lib/active_record/attributes.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/attribute/user_provided_default"
module ActiveRecord
diff --git a/activerecord/lib/active_record/autosave_association.rb b/activerecord/lib/active_record/autosave_association.rb
index 70f0e2af8e..137e9673ab 100644
--- a/activerecord/lib/active_record/autosave_association.rb
+++ b/activerecord/lib/active_record/autosave_association.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record Autosave Association
#
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index ac1aa2df45..5229c82f3a 100644
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "yaml"
require "active_support/benchmarkable"
require "active_support/dependencies"
diff --git a/activerecord/lib/active_record/callbacks.rb b/activerecord/lib/active_record/callbacks.rb
index eb44887e18..b25a8e4033 100644
--- a/activerecord/lib/active_record/callbacks.rb
+++ b/activerecord/lib/active_record/callbacks.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record \Callbacks
#
diff --git a/activerecord/lib/active_record/coders/json.rb b/activerecord/lib/active_record/coders/json.rb
index cb185a881e..a7ad65fbf4 100644
--- a/activerecord/lib/active_record/coders/json.rb
+++ b/activerecord/lib/active_record/coders/json.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Coders # :nodoc:
class JSON # :nodoc:
diff --git a/activerecord/lib/active_record/coders/yaml_column.rb b/activerecord/lib/active_record/coders/yaml_column.rb
index 9c52a31b95..7186252b8b 100644
--- a/activerecord/lib/active_record/coders/yaml_column.rb
+++ b/activerecord/lib/active_record/coders/yaml_column.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "yaml"
module ActiveRecord
diff --git a/activerecord/lib/active_record/collection_cache_key.rb b/activerecord/lib/active_record/collection_cache_key.rb
index 8b937b6703..7831aee3a4 100644
--- a/activerecord/lib/active_record/collection_cache_key.rb
+++ b/activerecord/lib/active_record/collection_cache_key.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module CollectionCacheKey
def collection_cache_key(collection = all, timestamp_column = :updated_at) # :nodoc:
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
index 61bf5477aa..fcdef9f033 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "thread"
require "concurrent/map"
require "monitor"
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb b/activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb
index 407e019326..6331b1546a 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/database_limits.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters # :nodoc:
module DatabaseLimits
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
index af5314c1d6..d36e8d7fdd 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters # :nodoc:
module DatabaseStatements
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb b/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb
index c352ddfc11..31d8f53a10 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters # :nodoc:
module QueryCache
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb b/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb
index 61233dcc51..631e5176bb 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/big_decimal/conversions"
require "active_support/multibyte/chars"
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/savepoints.rb b/activerecord/lib/active_record/connection_adapters/abstract/savepoints.rb
index 3a06f75292..b1b793828d 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/savepoints.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/savepoints.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module Savepoints
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_creation.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_creation.rb
index 93f4529202..19f0d7558e 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_creation.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_creation.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/string/strip"
module ActiveRecord
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
index a30fbe0e05..6dbf669993 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters #:nodoc:
# Abstract representation of an index definition on a table. Instances of
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_dumper.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_dumper.rb
index 34036d8a1d..ef8038b5c3 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_dumper.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_dumper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters # :nodoc:
# The goal of this module is to move Adapter specific column
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
index 22d7791dec..cf93eb052b 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/migration/join_table"
require "active_support/core_ext/string/access"
require "digest"
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb b/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb
index 19b7821494..013cf5bfb6 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
class TransactionState
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index 85d6fbe8b3..820803f715 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/type"
require "active_record/connection_adapters/determine_if_preparable_visitor"
require "active_record/connection_adapters/schema_cache"
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
index 183f0f3c1b..4e29801d3e 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/connection_adapters/abstract_adapter"
require "active_record/connection_adapters/statement_pool"
require "active_record/connection_adapters/mysql/column"
diff --git a/activerecord/lib/active_record/connection_adapters/column.rb b/activerecord/lib/active_record/connection_adapters/column.rb
index 61cd7ae4cc..34eca70253 100644
--- a/activerecord/lib/active_record/connection_adapters/column.rb
+++ b/activerecord/lib/active_record/connection_adapters/column.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# :stopdoc:
module ConnectionAdapters
diff --git a/activerecord/lib/active_record/connection_adapters/connection_specification.rb b/activerecord/lib/active_record/connection_adapters/connection_specification.rb
index 3e4ea28f63..de54787458 100644
--- a/activerecord/lib/active_record/connection_adapters/connection_specification.rb
+++ b/activerecord/lib/active_record/connection_adapters/connection_specification.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "uri"
module ActiveRecord
diff --git a/activerecord/lib/active_record/connection_adapters/determine_if_preparable_visitor.rb b/activerecord/lib/active_record/connection_adapters/determine_if_preparable_visitor.rb
index 0fdc185c45..e57147221f 100644
--- a/activerecord/lib/active_record/connection_adapters/determine_if_preparable_visitor.rb
+++ b/activerecord/lib/active_record/connection_adapters/determine_if_preparable_visitor.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module DetermineIfPreparableVisitor
diff --git a/activerecord/lib/active_record/connection_adapters/mysql/column.rb b/activerecord/lib/active_record/connection_adapters/mysql/column.rb
index c9ad47c035..8bdc2a1622 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql/column.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql/column.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module MySQL
diff --git a/activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb b/activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb
index 9f1021456b..733b4ce734 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module MySQL
diff --git a/activerecord/lib/active_record/connection_adapters/mysql/explain_pretty_printer.rb b/activerecord/lib/active_record/connection_adapters/mysql/explain_pretty_printer.rb
index 9691060cd3..f174ba5b0e 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql/explain_pretty_printer.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql/explain_pretty_printer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module MySQL
diff --git a/activerecord/lib/active_record/connection_adapters/mysql/quoting.rb b/activerecord/lib/active_record/connection_adapters/mysql/quoting.rb
index d4f5906b33..9fcf1e0a89 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql/quoting.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql/quoting.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module MySQL
diff --git a/activerecord/lib/active_record/connection_adapters/mysql/schema_creation.rb b/activerecord/lib/active_record/connection_adapters/mysql/schema_creation.rb
index 083cd6340f..285aed12e2 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql/schema_creation.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql/schema_creation.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module MySQL
diff --git a/activerecord/lib/active_record/connection_adapters/mysql/schema_definitions.rb b/activerecord/lib/active_record/connection_adapters/mysql/schema_definitions.rb
index 6d88c14d50..b62b857bb7 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql/schema_definitions.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql/schema_definitions.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module MySQL
diff --git a/activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb b/activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb
index f21b2546de..1748bceb4e 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module MySQL
diff --git a/activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb
index fc57e41fc9..7d6fa4b60a 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module MySQL
diff --git a/activerecord/lib/active_record/connection_adapters/mysql/type_metadata.rb b/activerecord/lib/active_record/connection_adapters/mysql/type_metadata.rb
index 9ad6a6c0d0..aa4d98e06b 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql/type_metadata.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql/type_metadata.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module MySQL
diff --git a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
index af55cfe2f6..350a99a2e4 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/connection_adapters/abstract_mysql_adapter"
require "active_record/connection_adapters/mysql/database_statements"
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/column.rb b/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
index 3ad1911a28..36382b6d57 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/column.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
# PostgreSQL-specific extensions to column definitions in a table.
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb b/activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb
index ebf1715ed0..659b860cce 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/database_statements.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/explain_pretty_printer.rb b/activerecord/lib/active_record/connection_adapters/postgresql/explain_pretty_printer.rb
index 99f3a5bbdf..21d0b4a0d2 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/explain_pretty_printer.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/explain_pretty_printer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb
index 4098250f3e..ea07b48430 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/connection_adapters/postgresql/oid/array"
require "active_record/connection_adapters/postgresql/oid/bit"
require "active_record/connection_adapters/postgresql/oid/bit_varying"
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
index a73a8c1726..fd629012ec 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/bit.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/bit.rb
index 0a505f46a7..70e84d85c2 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/bit.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/bit.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/bit_varying.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/bit_varying.rb
index 4c21097d48..b4ea3b4edd 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/bit_varying.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/bit_varying.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/bytea.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/bytea.rb
index 702fa8175c..4902a64330 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/bytea.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/bytea.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/cidr.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/cidr.rb
index 5225609e37..2007665ec0 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/cidr.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/cidr.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "ipaddr"
module ActiveRecord
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/date_time.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/date_time.rb
index b7acbf7178..110771e7a2 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/date_time.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/date_time.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/decimal.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/decimal.rb
index 43d22c8daf..bc720a36c8 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/decimal.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/decimal.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/enum.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/enum.rb
index 950d23d516..db1cd22b48 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/enum.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/enum.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/hstore.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/hstore.rb
index 49dd4fc73f..828bcd23dd 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/hstore.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/hstore.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/inet.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/inet.rb
index 96486fa65b..4cc78a8c10 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/inet.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/inet.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/json.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/json.rb
index 3c706c27c4..bb0f8487fa 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/json.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/json.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/jsonb.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/jsonb.rb
index a1fec289d4..fcb6c1498d 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/jsonb.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/jsonb.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/legacy_point.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/legacy_point.rb
index 775eecaf85..3ed9fefee8 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/legacy_point.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/legacy_point.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/money.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/money.rb
index 7a91272d1c..cc3e0c9169 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/money.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/money.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/oid.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/oid.rb
index 9c2ac08b30..d8b47e8e29 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/oid.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/oid.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/point.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/point.rb
index 7c764e7287..3275f28d0c 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/point.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/point.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
Point = Struct.new(:x, :y)
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/range.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/range.rb
index 54d5d0902e..eddb0fb0ac 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/range.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/range.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/specialized_string.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/specialized_string.rb
index 564e82a4ac..f5270a64ab 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/specialized_string.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/specialized_string.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/type_map_initializer.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/type_map_initializer.rb
index d9ae1aa7a2..503691f7fc 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/type_map_initializer.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/type_map_initializer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/uuid.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/uuid.rb
index 5e839228e9..2fdf3b5d8e 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/uuid.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/uuid.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/vector.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/vector.rb
index b26e876b54..6d86a221a7 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/vector.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/vector.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/xml.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/xml.rb
index d40d837cee..f0e21f9f23 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/xml.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/xml.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb b/activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb
index 44eb666965..9ffa81ec59 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/quoting.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/referential_integrity.rb b/activerecord/lib/active_record/connection_adapters/postgresql/referential_integrity.rb
index 44a7338bf5..3387bad79f 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/referential_integrity.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/referential_integrity.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/schema_creation.rb b/activerecord/lib/active_record/connection_adapters/postgresql/schema_creation.rb
index e1d5089115..5fab6f60d2 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/schema_creation.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/schema_creation.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/schema_definitions.rb b/activerecord/lib/active_record/connection_adapters/postgresql/schema_definitions.rb
index 11ea1e5144..32b7239f54 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/schema_definitions.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/schema_definitions.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/schema_dumper.rb b/activerecord/lib/active_record/connection_adapters/postgresql/schema_dumper.rb
index 5555a46b6b..a631e4534f 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/schema_dumper.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/schema_dumper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb
index 7aa034f901..b746304c27 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/string/strip"
module ActiveRecord
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/type_metadata.rb b/activerecord/lib/active_record/connection_adapters/postgresql/type_metadata.rb
index f57179ae59..110cc88872 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/type_metadata.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/type_metadata.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
class PostgreSQLTypeMetadata < DelegateClass(SqlTypeMetadata)
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/utils.rb b/activerecord/lib/active_record/connection_adapters/postgresql/utils.rb
index aa7940188a..6a4d6d50bd 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/utils.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/utils.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module PostgreSQL
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
index 99edbe486f..edf313f49d 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
# Make sure we're using pg high enough for type casts and Ruby 2.2+ compatibility
gem "pg", "~> 0.18"
require "pg"
diff --git a/activerecord/lib/active_record/connection_adapters/schema_cache.rb b/activerecord/lib/active_record/connection_adapters/schema_cache.rb
index 4d339b0a8c..32aa9d803b 100644
--- a/activerecord/lib/active_record/connection_adapters/schema_cache.rb
+++ b/activerecord/lib/active_record/connection_adapters/schema_cache.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
class SchemaCache
diff --git a/activerecord/lib/active_record/connection_adapters/sql_type_metadata.rb b/activerecord/lib/active_record/connection_adapters/sql_type_metadata.rb
index 9e12ae0de8..e6908e9846 100644
--- a/activerecord/lib/active_record/connection_adapters/sql_type_metadata.rb
+++ b/activerecord/lib/active_record/connection_adapters/sql_type_metadata.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# :stopdoc:
module ConnectionAdapters
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3/explain_pretty_printer.rb b/activerecord/lib/active_record/connection_adapters/sqlite3/explain_pretty_printer.rb
index 6fe3e1211e..01cfafdd2b 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite3/explain_pretty_printer.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite3/explain_pretty_printer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module SQLite3
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3/quoting.rb b/activerecord/lib/active_record/connection_adapters/sqlite3/quoting.rb
index 7276a65098..c5bc797d48 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite3/quoting.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite3/quoting.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module SQLite3
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3/schema_creation.rb b/activerecord/lib/active_record/connection_adapters/sqlite3/schema_creation.rb
index bc798d1dbb..bcd43eac08 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite3/schema_creation.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite3/schema_creation.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module SQLite3
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3/schema_definitions.rb b/activerecord/lib/active_record/connection_adapters/sqlite3/schema_definitions.rb
index e157e4b218..7bbda675eb 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite3/schema_definitions.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite3/schema_definitions.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module SQLite3
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3/schema_dumper.rb b/activerecord/lib/active_record/connection_adapters/sqlite3/schema_dumper.rb
index eec018eda3..d265a60206 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite3/schema_dumper.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite3/schema_dumper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module SQLite3
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/sqlite3/schema_statements.rb
index e02491edb6..9c10970d34 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite3/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite3/schema_statements.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
module SQLite3
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
index ee2faf43b5..c4cbdb588c 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/connection_adapters/abstract_adapter"
require "active_record/connection_adapters/statement_pool"
require "active_record/connection_adapters/sqlite3/explain_pretty_printer"
diff --git a/activerecord/lib/active_record/connection_adapters/statement_pool.rb b/activerecord/lib/active_record/connection_adapters/statement_pool.rb
index 790db56185..e7c237d42f 100644
--- a/activerecord/lib/active_record/connection_adapters/statement_pool.rb
+++ b/activerecord/lib/active_record/connection_adapters/statement_pool.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
class StatementPool # :nodoc:
diff --git a/activerecord/lib/active_record/connection_handling.rb b/activerecord/lib/active_record/connection_handling.rb
index b8fbb489b6..61f160b99d 100644
--- a/activerecord/lib/active_record/connection_handling.rb
+++ b/activerecord/lib/active_record/connection_handling.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ConnectionHandling
RAILS_ENV = -> { (Rails.env if defined?(Rails.env)) || ENV["RAILS_ENV"].presence || ENV["RACK_ENV"].presence }
diff --git a/activerecord/lib/active_record/core.rb b/activerecord/lib/active_record/core.rb
index 198c712abc..f1eaa07f1a 100644
--- a/activerecord/lib/active_record/core.rb
+++ b/activerecord/lib/active_record/core.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "thread"
require "active_support/core_ext/hash/indifferent_access"
require "active_support/core_ext/object/duplicable"
diff --git a/activerecord/lib/active_record/counter_cache.rb b/activerecord/lib/active_record/counter_cache.rb
index cbd71a3779..5dcd28244a 100644
--- a/activerecord/lib/active_record/counter_cache.rb
+++ b/activerecord/lib/active_record/counter_cache.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record Counter Cache
module CounterCache
diff --git a/activerecord/lib/active_record/define_callbacks.rb b/activerecord/lib/active_record/define_callbacks.rb
index 7d955a24be..291ebd3678 100644
--- a/activerecord/lib/active_record/define_callbacks.rb
+++ b/activerecord/lib/active_record/define_callbacks.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# This module exists because `ActiveRecord::AttributeMethods::Dirty` needs to
# define callbacks, but continue to have its version of `save` be the super
diff --git a/activerecord/lib/active_record/dynamic_matchers.rb b/activerecord/lib/active_record/dynamic_matchers.rb
index 3a9625092e..a3425c8097 100644
--- a/activerecord/lib/active_record/dynamic_matchers.rb
+++ b/activerecord/lib/active_record/dynamic_matchers.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module DynamicMatchers #:nodoc:
private
diff --git a/activerecord/lib/active_record/enum.rb b/activerecord/lib/active_record/enum.rb
index 12ef58a941..86ffa28306 100644
--- a/activerecord/lib/active_record/enum.rb
+++ b/activerecord/lib/active_record/enum.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/object/deep_dup"
module ActiveRecord
diff --git a/activerecord/lib/active_record/errors.rb b/activerecord/lib/active_record/errors.rb
index 60d4fb70e0..7507d61535 100644
--- a/activerecord/lib/active_record/errors.rb
+++ b/activerecord/lib/active_record/errors.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record Errors
#
diff --git a/activerecord/lib/active_record/explain.rb b/activerecord/lib/active_record/explain.rb
index 8f7ae2c33c..c6a9e2a67c 100644
--- a/activerecord/lib/active_record/explain.rb
+++ b/activerecord/lib/active_record/explain.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/explain_registry"
module ActiveRecord
diff --git a/activerecord/lib/active_record/explain_registry.rb b/activerecord/lib/active_record/explain_registry.rb
index ef1ce3dc85..0af48be6fd 100644
--- a/activerecord/lib/active_record/explain_registry.rb
+++ b/activerecord/lib/active_record/explain_registry.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/per_thread_registry"
module ActiveRecord
diff --git a/activerecord/lib/active_record/explain_subscriber.rb b/activerecord/lib/active_record/explain_subscriber.rb
index abd8cfc8f2..07a412a8a1 100644
--- a/activerecord/lib/active_record/explain_subscriber.rb
+++ b/activerecord/lib/active_record/explain_subscriber.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/notifications"
require "active_record/explain_registry"
diff --git a/activerecord/lib/active_record/fixture_set/file.rb b/activerecord/lib/active_record/fixture_set/file.rb
index 6cf2e01179..93b8ba07e9 100644
--- a/activerecord/lib/active_record/fixture_set/file.rb
+++ b/activerecord/lib/active_record/fixture_set/file.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "erb"
require "yaml"
diff --git a/activerecord/lib/active_record/fixtures.rb b/activerecord/lib/active_record/fixtures.rb
index e9acb8acae..1835965b7f 100644
--- a/activerecord/lib/active_record/fixtures.rb
+++ b/activerecord/lib/active_record/fixtures.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "erb"
require "yaml"
require "zlib"
diff --git a/activerecord/lib/active_record/gem_version.rb b/activerecord/lib/active_record/gem_version.rb
index 1a937dbcf7..a0434766f5 100644
--- a/activerecord/lib/active_record/gem_version.rb
+++ b/activerecord/lib/active_record/gem_version.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# Returns the version of the currently loaded Active Record as a <tt>Gem::Version</tt>
def self.gem_version
diff --git a/activerecord/lib/active_record/inheritance.rb b/activerecord/lib/active_record/inheritance.rb
index 5776807507..10911b9a3e 100644
--- a/activerecord/lib/active_record/inheritance.rb
+++ b/activerecord/lib/active_record/inheritance.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/hash/indifferent_access"
module ActiveRecord
diff --git a/activerecord/lib/active_record/integration.rb b/activerecord/lib/active_record/integration.rb
index cf954852bc..2bb96457c6 100644
--- a/activerecord/lib/active_record/integration.rb
+++ b/activerecord/lib/active_record/integration.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/string/filters"
module ActiveRecord
diff --git a/activerecord/lib/active_record/internal_metadata.rb b/activerecord/lib/active_record/internal_metadata.rb
index 25ee9d6bfe..9ec6b51cb3 100644
--- a/activerecord/lib/active_record/internal_metadata.rb
+++ b/activerecord/lib/active_record/internal_metadata.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/scoping/default"
require "active_record/scoping/named"
diff --git a/activerecord/lib/active_record/legacy_yaml_adapter.rb b/activerecord/lib/active_record/legacy_yaml_adapter.rb
index c7683f68c7..ba74f1a56c 100644
--- a/activerecord/lib/active_record/legacy_yaml_adapter.rb
+++ b/activerecord/lib/active_record/legacy_yaml_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module LegacyYamlAdapter
def self.convert(klass, coder)
diff --git a/activerecord/lib/active_record/locking/optimistic.rb b/activerecord/lib/active_record/locking/optimistic.rb
index 522da6a571..2e2f2979d8 100644
--- a/activerecord/lib/active_record/locking/optimistic.rb
+++ b/activerecord/lib/active_record/locking/optimistic.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Locking
# == What is Optimistic Locking
diff --git a/activerecord/lib/active_record/locking/pessimistic.rb b/activerecord/lib/active_record/locking/pessimistic.rb
index 263e2a5f7f..0fb4dc3a35 100644
--- a/activerecord/lib/active_record/locking/pessimistic.rb
+++ b/activerecord/lib/active_record/locking/pessimistic.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Locking
# Locking::Pessimistic provides support for row-level locking using
diff --git a/activerecord/lib/active_record/log_subscriber.rb b/activerecord/lib/active_record/log_subscriber.rb
index e39ca5f6dc..e8593c1a48 100644
--- a/activerecord/lib/active_record/log_subscriber.rb
+++ b/activerecord/lib/active_record/log_subscriber.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class LogSubscriber < ActiveSupport::LogSubscriber
IGNORE_PAYLOAD_NAMES = ["SCHEMA", "EXPLAIN"]
diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
index 51c82f4ced..f83842958c 100644
--- a/activerecord/lib/active_record/migration.rb
+++ b/activerecord/lib/active_record/migration.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "set"
require "zlib"
require "active_support/core_ext/module/attribute_accessors"
diff --git a/activerecord/lib/active_record/migration/command_recorder.rb b/activerecord/lib/active_record/migration/command_recorder.rb
index f9cf59b283..1641044841 100644
--- a/activerecord/lib/active_record/migration/command_recorder.rb
+++ b/activerecord/lib/active_record/migration/command_recorder.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class Migration
# <tt>ActiveRecord::Migration::CommandRecorder</tt> records commands done during
diff --git a/activerecord/lib/active_record/migration/compatibility.rb b/activerecord/lib/active_record/migration/compatibility.rb
index 188dd0acef..ccb1b2ddd7 100644
--- a/activerecord/lib/active_record/migration/compatibility.rb
+++ b/activerecord/lib/active_record/migration/compatibility.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class Migration
module Compatibility # :nodoc: all
diff --git a/activerecord/lib/active_record/migration/join_table.rb b/activerecord/lib/active_record/migration/join_table.rb
index 89789f00ea..026217880c 100644
--- a/activerecord/lib/active_record/migration/join_table.rb
+++ b/activerecord/lib/active_record/migration/join_table.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class Migration
module JoinTable #:nodoc:
diff --git a/activerecord/lib/active_record/model_schema.rb b/activerecord/lib/active_record/model_schema.rb
index 14e0f5bff7..e846bcc1a1 100644
--- a/activerecord/lib/active_record/model_schema.rb
+++ b/activerecord/lib/active_record/model_schema.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "monitor"
module ActiveRecord
diff --git a/activerecord/lib/active_record/nested_attributes.rb b/activerecord/lib/active_record/nested_attributes.rb
index 917bc76993..43d4364e35 100644
--- a/activerecord/lib/active_record/nested_attributes.rb
+++ b/activerecord/lib/active_record/nested_attributes.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/hash/except"
require "active_support/core_ext/object/try"
require "active_support/core_ext/hash/indifferent_access"
diff --git a/activerecord/lib/active_record/no_touching.rb b/activerecord/lib/active_record/no_touching.rb
index 4059020e25..84ee036c17 100644
--- a/activerecord/lib/active_record/no_touching.rb
+++ b/activerecord/lib/active_record/no_touching.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record No Touching
module NoTouching
diff --git a/activerecord/lib/active_record/null_relation.rb b/activerecord/lib/active_record/null_relation.rb
index 26966f9433..6d65154a14 100644
--- a/activerecord/lib/active_record/null_relation.rb
+++ b/activerecord/lib/active_record/null_relation.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module NullRelation # :nodoc:
def pluck(*column_names)
diff --git a/activerecord/lib/active_record/persistence.rb b/activerecord/lib/active_record/persistence.rb
index b2dba5516e..c310ae3575 100644
--- a/activerecord/lib/active_record/persistence.rb
+++ b/activerecord/lib/active_record/persistence.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record \Persistence
module Persistence
diff --git a/activerecord/lib/active_record/query_cache.rb b/activerecord/lib/active_record/query_cache.rb
index e4c2e1f86f..17e6bbfec0 100644
--- a/activerecord/lib/active_record/query_cache.rb
+++ b/activerecord/lib/active_record/query_cache.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record Query Cache
class QueryCache
diff --git a/activerecord/lib/active_record/querying.rb b/activerecord/lib/active_record/querying.rb
index b16e178358..dd7d833a96 100644
--- a/activerecord/lib/active_record/querying.rb
+++ b/activerecord/lib/active_record/querying.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Querying
delegate :find, :take, :take!, :first, :first!, :last, :last!, :exists?, :any?, :many?, :none?, :one?, to: :all
diff --git a/activerecord/lib/active_record/railtie.rb b/activerecord/lib/active_record/railtie.rb
index 73518ca144..441dca9fe7 100644
--- a/activerecord/lib/active_record/railtie.rb
+++ b/activerecord/lib/active_record/railtie.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record"
require "rails"
require "active_model/railtie"
diff --git a/activerecord/lib/active_record/railties/console_sandbox.rb b/activerecord/lib/active_record/railties/console_sandbox.rb
index 604a220303..03286eacbb 100644
--- a/activerecord/lib/active_record/railties/console_sandbox.rb
+++ b/activerecord/lib/active_record/railties/console_sandbox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
ActiveRecord::Base.connection.begin_transaction(joinable: false)
at_exit do
diff --git a/activerecord/lib/active_record/railties/controller_runtime.rb b/activerecord/lib/active_record/railties/controller_runtime.rb
index 8658188623..297f3fc8bc 100644
--- a/activerecord/lib/active_record/railties/controller_runtime.rb
+++ b/activerecord/lib/active_record/railties/controller_runtime.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/module/attr_internal"
require "active_record/log_subscriber"
diff --git a/activerecord/lib/active_record/railties/databases.rake b/activerecord/lib/active_record/railties/databases.rake
index 711099e9e1..7c0d066e88 100644
--- a/activerecord/lib/active_record/railties/databases.rake
+++ b/activerecord/lib/active_record/railties/databases.rake
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record"
db_namespace = namespace :db do
diff --git a/activerecord/lib/active_record/railties/jdbcmysql_error.rb b/activerecord/lib/active_record/railties/jdbcmysql_error.rb
index d7cf4df339..f614c067d7 100644
--- a/activerecord/lib/active_record/railties/jdbcmysql_error.rb
+++ b/activerecord/lib/active_record/railties/jdbcmysql_error.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
#FIXME Remove if ArJdbcMysql will give.
module ArJdbcMySQL #:nodoc:
class Error < StandardError #:nodoc:
diff --git a/activerecord/lib/active_record/readonly_attributes.rb b/activerecord/lib/active_record/readonly_attributes.rb
index af6473d250..7bf305eb31 100644
--- a/activerecord/lib/active_record/readonly_attributes.rb
+++ b/activerecord/lib/active_record/readonly_attributes.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module ReadonlyAttributes
extend ActiveSupport::Concern
diff --git a/activerecord/lib/active_record/reflection.rb b/activerecord/lib/active_record/reflection.rb
index 73761ed7ed..be76256186 100644
--- a/activerecord/lib/active_record/reflection.rb
+++ b/activerecord/lib/active_record/reflection.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "thread"
require "active_support/core_ext/string/filters"
require "active_support/deprecation"
diff --git a/activerecord/lib/active_record/relation.rb b/activerecord/lib/active_record/relation.rb
index 52f5d5f3e3..55b59eeb54 100644
--- a/activerecord/lib/active_record/relation.rb
+++ b/activerecord/lib/active_record/relation.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record \Relation
class Relation
diff --git a/activerecord/lib/active_record/relation/batches.rb b/activerecord/lib/active_record/relation/batches.rb
index 13a2c3f511..ac48ffb1bc 100644
--- a/activerecord/lib/active_record/relation/batches.rb
+++ b/activerecord/lib/active_record/relation/batches.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/relation/batches/batch_enumerator"
module ActiveRecord
diff --git a/activerecord/lib/active_record/relation/batches/batch_enumerator.rb b/activerecord/lib/active_record/relation/batches/batch_enumerator.rb
index 3555779ec2..02c70d5cf0 100644
--- a/activerecord/lib/active_record/relation/batches/batch_enumerator.rb
+++ b/activerecord/lib/active_record/relation/batches/batch_enumerator.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Batches
class BatchEnumerator
diff --git a/activerecord/lib/active_record/relation/calculations.rb b/activerecord/lib/active_record/relation/calculations.rb
index 8a54f8f2c3..6514c7bde8 100644
--- a/activerecord/lib/active_record/relation/calculations.rb
+++ b/activerecord/lib/active_record/relation/calculations.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Calculations
# Count the records.
diff --git a/activerecord/lib/active_record/relation/delegation.rb b/activerecord/lib/active_record/relation/delegation.rb
index 48c4dcdef4..6d3b59d339 100644
--- a/activerecord/lib/active_record/relation/delegation.rb
+++ b/activerecord/lib/active_record/relation/delegation.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Delegation # :nodoc:
module DelegateCache # :nodoc:
diff --git a/activerecord/lib/active_record/relation/finder_methods.rb b/activerecord/lib/active_record/relation/finder_methods.rb
index df8909379f..caa65af50c 100644
--- a/activerecord/lib/active_record/relation/finder_methods.rb
+++ b/activerecord/lib/active_record/relation/finder_methods.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/string/filters"
module ActiveRecord
diff --git a/activerecord/lib/active_record/relation/from_clause.rb b/activerecord/lib/active_record/relation/from_clause.rb
index 8945cb0cc5..ea838b79a6 100644
--- a/activerecord/lib/active_record/relation/from_clause.rb
+++ b/activerecord/lib/active_record/relation/from_clause.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class Relation
class FromClause # :nodoc:
diff --git a/activerecord/lib/active_record/relation/merger.rb b/activerecord/lib/active_record/relation/merger.rb
index 5dac00724a..84c31e4126 100644
--- a/activerecord/lib/active_record/relation/merger.rb
+++ b/activerecord/lib/active_record/relation/merger.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/hash/keys"
module ActiveRecord
diff --git a/activerecord/lib/active_record/relation/predicate_builder.rb b/activerecord/lib/active_record/relation/predicate_builder.rb
index 7dea5deec5..72314180dd 100644
--- a/activerecord/lib/active_record/relation/predicate_builder.rb
+++ b/activerecord/lib/active_record/relation/predicate_builder.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class PredicateBuilder # :nodoc:
delegate :resolve_column_aliases, to: :table
diff --git a/activerecord/lib/active_record/relation/predicate_builder/array_handler.rb b/activerecord/lib/active_record/relation/predicate_builder/array_handler.rb
index 1068e700e2..4d0778df36 100644
--- a/activerecord/lib/active_record/relation/predicate_builder/array_handler.rb
+++ b/activerecord/lib/active_record/relation/predicate_builder/array_handler.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class PredicateBuilder
class ArrayHandler # :nodoc:
diff --git a/activerecord/lib/active_record/relation/predicate_builder/association_query_value.rb b/activerecord/lib/active_record/relation/predicate_builder/association_query_value.rb
index 3e19646ae5..66690d6b5c 100644
--- a/activerecord/lib/active_record/relation/predicate_builder/association_query_value.rb
+++ b/activerecord/lib/active_record/relation/predicate_builder/association_query_value.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class PredicateBuilder
class AssociationQueryValue # :nodoc:
diff --git a/activerecord/lib/active_record/relation/predicate_builder/base_handler.rb b/activerecord/lib/active_record/relation/predicate_builder/base_handler.rb
index 3bb1037885..3472b16cef 100644
--- a/activerecord/lib/active_record/relation/predicate_builder/base_handler.rb
+++ b/activerecord/lib/active_record/relation/predicate_builder/base_handler.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class PredicateBuilder
class BaseHandler # :nodoc:
diff --git a/activerecord/lib/active_record/relation/predicate_builder/basic_object_handler.rb b/activerecord/lib/active_record/relation/predicate_builder/basic_object_handler.rb
index 79cde00303..3190602506 100644
--- a/activerecord/lib/active_record/relation/predicate_builder/basic_object_handler.rb
+++ b/activerecord/lib/active_record/relation/predicate_builder/basic_object_handler.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class PredicateBuilder
class BasicObjectHandler # :nodoc:
diff --git a/activerecord/lib/active_record/relation/predicate_builder/polymorphic_array_value.rb b/activerecord/lib/active_record/relation/predicate_builder/polymorphic_array_value.rb
index 7029ae5f47..5032177757 100644
--- a/activerecord/lib/active_record/relation/predicate_builder/polymorphic_array_value.rb
+++ b/activerecord/lib/active_record/relation/predicate_builder/polymorphic_array_value.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class PredicateBuilder
class PolymorphicArrayValue # :nodoc:
diff --git a/activerecord/lib/active_record/relation/predicate_builder/range_handler.rb b/activerecord/lib/active_record/relation/predicate_builder/range_handler.rb
index 5db778e19c..ddd804b508 100644
--- a/activerecord/lib/active_record/relation/predicate_builder/range_handler.rb
+++ b/activerecord/lib/active_record/relation/predicate_builder/range_handler.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class PredicateBuilder
class RangeHandler # :nodoc:
diff --git a/activerecord/lib/active_record/relation/predicate_builder/relation_handler.rb b/activerecord/lib/active_record/relation/predicate_builder/relation_handler.rb
index 8a910a82fe..4e1e644599 100644
--- a/activerecord/lib/active_record/relation/predicate_builder/relation_handler.rb
+++ b/activerecord/lib/active_record/relation/predicate_builder/relation_handler.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class PredicateBuilder
class RelationHandler # :nodoc:
diff --git a/activerecord/lib/active_record/relation/query_attribute.rb b/activerecord/lib/active_record/relation/query_attribute.rb
index a68e508fcc..410a375e52 100644
--- a/activerecord/lib/active_record/relation/query_attribute.rb
+++ b/activerecord/lib/active_record/relation/query_attribute.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/attribute"
module ActiveRecord
diff --git a/activerecord/lib/active_record/relation/query_methods.rb b/activerecord/lib/active_record/relation/query_methods.rb
index d44f6fd572..4ddc933e3d 100644
--- a/activerecord/lib/active_record/relation/query_methods.rb
+++ b/activerecord/lib/active_record/relation/query_methods.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/relation/from_clause"
require "active_record/relation/query_attribute"
require "active_record/relation/where_clause"
diff --git a/activerecord/lib/active_record/relation/record_fetch_warning.rb b/activerecord/lib/active_record/relation/record_fetch_warning.rb
index 31544c730e..8e221f1570 100644
--- a/activerecord/lib/active_record/relation/record_fetch_warning.rb
+++ b/activerecord/lib/active_record/relation/record_fetch_warning.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class Relation
module RecordFetchWarning
diff --git a/activerecord/lib/active_record/relation/spawn_methods.rb b/activerecord/lib/active_record/relation/spawn_methods.rb
index ada89b5ec3..8b7b01259e 100644
--- a/activerecord/lib/active_record/relation/spawn_methods.rb
+++ b/activerecord/lib/active_record/relation/spawn_methods.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/hash/except"
require "active_support/core_ext/hash/slice"
require "active_record/relation/merger"
diff --git a/activerecord/lib/active_record/relation/where_clause.rb b/activerecord/lib/active_record/relation/where_clause.rb
index 119910ee79..a809752928 100644
--- a/activerecord/lib/active_record/relation/where_clause.rb
+++ b/activerecord/lib/active_record/relation/where_clause.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class Relation
class WhereClause # :nodoc:
diff --git a/activerecord/lib/active_record/relation/where_clause_factory.rb b/activerecord/lib/active_record/relation/where_clause_factory.rb
index b862dd56a5..156088f534 100644
--- a/activerecord/lib/active_record/relation/where_clause_factory.rb
+++ b/activerecord/lib/active_record/relation/where_clause_factory.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class Relation
class WhereClauseFactory # :nodoc:
diff --git a/activerecord/lib/active_record/result.rb b/activerecord/lib/active_record/result.rb
index 26b1d48e9e..5e1c0bfefc 100644
--- a/activerecord/lib/active_record/result.rb
+++ b/activerecord/lib/active_record/result.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
###
# This class encapsulates a result returned from calling
diff --git a/activerecord/lib/active_record/runtime_registry.rb b/activerecord/lib/active_record/runtime_registry.rb
index b79eb2263f..d068d8898e 100644
--- a/activerecord/lib/active_record/runtime_registry.rb
+++ b/activerecord/lib/active_record/runtime_registry.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/per_thread_registry"
module ActiveRecord
diff --git a/activerecord/lib/active_record/sanitization.rb b/activerecord/lib/active_record/sanitization.rb
index 64bda1539c..a39e1a2e73 100644
--- a/activerecord/lib/active_record/sanitization.rb
+++ b/activerecord/lib/active_record/sanitization.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Sanitization
extend ActiveSupport::Concern
diff --git a/activerecord/lib/active_record/schema.rb b/activerecord/lib/active_record/schema.rb
index 5104427339..2578c5e3ef 100644
--- a/activerecord/lib/active_record/schema.rb
+++ b/activerecord/lib/active_record/schema.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record \Schema
#
diff --git a/activerecord/lib/active_record/schema_dumper.rb b/activerecord/lib/active_record/schema_dumper.rb
index 66a2846f3a..767da6816d 100644
--- a/activerecord/lib/active_record/schema_dumper.rb
+++ b/activerecord/lib/active_record/schema_dumper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "stringio"
module ActiveRecord
diff --git a/activerecord/lib/active_record/schema_migration.rb b/activerecord/lib/active_record/schema_migration.rb
index f59737afb0..e6336dfde3 100644
--- a/activerecord/lib/active_record/schema_migration.rb
+++ b/activerecord/lib/active_record/schema_migration.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/scoping/default"
require "active_record/scoping/named"
diff --git a/activerecord/lib/active_record/scoping.rb b/activerecord/lib/active_record/scoping.rb
index 94e0ef6724..c2cd35ee3b 100644
--- a/activerecord/lib/active_record/scoping.rb
+++ b/activerecord/lib/active_record/scoping.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/per_thread_registry"
module ActiveRecord
diff --git a/activerecord/lib/active_record/scoping/default.rb b/activerecord/lib/active_record/scoping/default.rb
index 70b2693b28..eeb89c405a 100644
--- a/activerecord/lib/active_record/scoping/default.rb
+++ b/activerecord/lib/active_record/scoping/default.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Scoping
module Default
diff --git a/activerecord/lib/active_record/scoping/named.rb b/activerecord/lib/active_record/scoping/named.rb
index b4026fabb2..c16cbce109 100644
--- a/activerecord/lib/active_record/scoping/named.rb
+++ b/activerecord/lib/active_record/scoping/named.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/array"
require "active_support/core_ext/hash/except"
require "active_support/core_ext/kernel/singleton_class"
diff --git a/activerecord/lib/active_record/secure_token.rb b/activerecord/lib/active_record/secure_token.rb
index 115799cc20..3b2d7e10bd 100644
--- a/activerecord/lib/active_record/secure_token.rb
+++ b/activerecord/lib/active_record/secure_token.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module SecureToken
extend ActiveSupport::Concern
diff --git a/activerecord/lib/active_record/serialization.rb b/activerecord/lib/active_record/serialization.rb
index db2bd0b55e..1907defb2e 100644
--- a/activerecord/lib/active_record/serialization.rb
+++ b/activerecord/lib/active_record/serialization.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord #:nodoc:
# = Active Record \Serialization
module Serialization
diff --git a/activerecord/lib/active_record/statement_cache.rb b/activerecord/lib/active_record/statement_cache.rb
index 1877489e55..fd04f9aedb 100644
--- a/activerecord/lib/active_record/statement_cache.rb
+++ b/activerecord/lib/active_record/statement_cache.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# Statement cache is used to cache a single statement in order to avoid creating the AST again.
# Initializing the cache is done by passing the statement in the create block:
diff --git a/activerecord/lib/active_record/store.rb b/activerecord/lib/active_record/store.rb
index 006afe7495..37888c28b5 100644
--- a/activerecord/lib/active_record/store.rb
+++ b/activerecord/lib/active_record/store.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/hash/indifferent_access"
module ActiveRecord
diff --git a/activerecord/lib/active_record/suppressor.rb b/activerecord/lib/active_record/suppressor.rb
index d9acb1a1dc..02185c2e0b 100644
--- a/activerecord/lib/active_record/suppressor.rb
+++ b/activerecord/lib/active_record/suppressor.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# ActiveRecord::Suppressor prevents the receiver from being saved during
# a given block.
diff --git a/activerecord/lib/active_record/table_metadata.rb b/activerecord/lib/active_record/table_metadata.rb
index 71efc1829a..a5dd3008d0 100644
--- a/activerecord/lib/active_record/table_metadata.rb
+++ b/activerecord/lib/active_record/table_metadata.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
class TableMetadata # :nodoc:
delegate :foreign_type, :foreign_key, to: :association, prefix: true
diff --git a/activerecord/lib/active_record/tasks/database_tasks.rb b/activerecord/lib/active_record/tasks/database_tasks.rb
index ba686fc562..bdfa683be4 100644
--- a/activerecord/lib/active_record/tasks/database_tasks.rb
+++ b/activerecord/lib/active_record/tasks/database_tasks.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Tasks # :nodoc:
class DatabaseAlreadyExists < StandardError; end # :nodoc:
diff --git a/activerecord/lib/active_record/tasks/mysql_database_tasks.rb b/activerecord/lib/active_record/tasks/mysql_database_tasks.rb
index c25d87dd3e..447bf09a4f 100644
--- a/activerecord/lib/active_record/tasks/mysql_database_tasks.rb
+++ b/activerecord/lib/active_record/tasks/mysql_database_tasks.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Tasks # :nodoc:
class MySQLDatabaseTasks # :nodoc:
diff --git a/activerecord/lib/active_record/tasks/postgresql_database_tasks.rb b/activerecord/lib/active_record/tasks/postgresql_database_tasks.rb
index 7f1a768d8b..e49480b27b 100644
--- a/activerecord/lib/active_record/tasks/postgresql_database_tasks.rb
+++ b/activerecord/lib/active_record/tasks/postgresql_database_tasks.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "tempfile"
module ActiveRecord
diff --git a/activerecord/lib/active_record/tasks/sqlite_database_tasks.rb b/activerecord/lib/active_record/tasks/sqlite_database_tasks.rb
index 01562b21e9..559142b57a 100644
--- a/activerecord/lib/active_record/tasks/sqlite_database_tasks.rb
+++ b/activerecord/lib/active_record/tasks/sqlite_database_tasks.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Tasks # :nodoc:
class SQLiteDatabaseTasks # :nodoc:
diff --git a/activerecord/lib/active_record/touch_later.rb b/activerecord/lib/active_record/touch_later.rb
index cacde9c881..1e484e59e3 100644
--- a/activerecord/lib/active_record/touch_later.rb
+++ b/activerecord/lib/active_record/touch_later.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record Touch Later
module TouchLater
diff --git a/activerecord/lib/active_record/transactions.rb b/activerecord/lib/active_record/transactions.rb
index 45795fa287..4e8d2a44e1 100644
--- a/activerecord/lib/active_record/transactions.rb
+++ b/activerecord/lib/active_record/transactions.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# See ActiveRecord::Transactions::ClassMethods for documentation.
module Transactions
diff --git a/activerecord/lib/active_record/translation.rb b/activerecord/lib/active_record/translation.rb
index ddcb5f2a7a..ecc508902c 100644
--- a/activerecord/lib/active_record/translation.rb
+++ b/activerecord/lib/active_record/translation.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Translation
include ActiveModel::Translation
diff --git a/activerecord/lib/active_record/type.rb b/activerecord/lib/active_record/type.rb
index 9ed6c95bf9..a179582e13 100644
--- a/activerecord/lib/active_record/type.rb
+++ b/activerecord/lib/active_record/type.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_model/type"
require "active_record/type/internal/timezone"
diff --git a/activerecord/lib/active_record/type/adapter_specific_registry.rb b/activerecord/lib/active_record/type/adapter_specific_registry.rb
index 7cc866f7a7..f24b9b9a36 100644
--- a/activerecord/lib/active_record/type/adapter_specific_registry.rb
+++ b/activerecord/lib/active_record/type/adapter_specific_registry.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_model/type/registry"
module ActiveRecord
diff --git a/activerecord/lib/active_record/type/date.rb b/activerecord/lib/active_record/type/date.rb
index ccafed054e..f1a40a8a6b 100644
--- a/activerecord/lib/active_record/type/date.rb
+++ b/activerecord/lib/active_record/type/date.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Type
class Date < ActiveModel::Type::Date
diff --git a/activerecord/lib/active_record/type/date_time.rb b/activerecord/lib/active_record/type/date_time.rb
index 1fb9380ecd..dadd76dbe0 100644
--- a/activerecord/lib/active_record/type/date_time.rb
+++ b/activerecord/lib/active_record/type/date_time.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Type
class DateTime < ActiveModel::Type::DateTime
diff --git a/activerecord/lib/active_record/type/decimal_without_scale.rb b/activerecord/lib/active_record/type/decimal_without_scale.rb
index 53a5e205da..ed0a4cfb23 100644
--- a/activerecord/lib/active_record/type/decimal_without_scale.rb
+++ b/activerecord/lib/active_record/type/decimal_without_scale.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Type
class DecimalWithoutScale < ActiveModel::Type::BigInteger # :nodoc:
diff --git a/activerecord/lib/active_record/type/hash_lookup_type_map.rb b/activerecord/lib/active_record/type/hash_lookup_type_map.rb
index 0145d5d6c1..96b6297132 100644
--- a/activerecord/lib/active_record/type/hash_lookup_type_map.rb
+++ b/activerecord/lib/active_record/type/hash_lookup_type_map.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Type
class HashLookupTypeMap < TypeMap # :nodoc:
diff --git a/activerecord/lib/active_record/type/internal/timezone.rb b/activerecord/lib/active_record/type/internal/timezone.rb
index 947e06158a..0c7d8ed76e 100644
--- a/activerecord/lib/active_record/type/internal/timezone.rb
+++ b/activerecord/lib/active_record/type/internal/timezone.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Type
module Internal
diff --git a/activerecord/lib/active_record/type/json.rb b/activerecord/lib/active_record/type/json.rb
index c4732fe388..9aec74241b 100644
--- a/activerecord/lib/active_record/type/json.rb
+++ b/activerecord/lib/active_record/type/json.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Type
class Json < ActiveModel::Type::Value
diff --git a/activerecord/lib/active_record/type/serialized.rb b/activerecord/lib/active_record/type/serialized.rb
index edbd20a6c1..96e7ad7152 100644
--- a/activerecord/lib/active_record/type/serialized.rb
+++ b/activerecord/lib/active_record/type/serialized.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Type
class Serialized < DelegateClass(ActiveModel::Type::Value) # :nodoc:
diff --git a/activerecord/lib/active_record/type/text.rb b/activerecord/lib/active_record/type/text.rb
index cb1949700a..3d7dd630e3 100644
--- a/activerecord/lib/active_record/type/text.rb
+++ b/activerecord/lib/active_record/type/text.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Type
class Text < ActiveModel::Type::String # :nodoc:
diff --git a/activerecord/lib/active_record/type/time.rb b/activerecord/lib/active_record/type/time.rb
index b9bac87c67..3ca7010c79 100644
--- a/activerecord/lib/active_record/type/time.rb
+++ b/activerecord/lib/active_record/type/time.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Type
class Time < ActiveModel::Type::Time
diff --git a/activerecord/lib/active_record/type/type_map.rb b/activerecord/lib/active_record/type/type_map.rb
index 7bce82a1ff..f28caff991 100644
--- a/activerecord/lib/active_record/type/type_map.rb
+++ b/activerecord/lib/active_record/type/type_map.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "concurrent/map"
module ActiveRecord
diff --git a/activerecord/lib/active_record/type/unsigned_integer.rb b/activerecord/lib/active_record/type/unsigned_integer.rb
index 9ae0109f9f..45f5dc506e 100644
--- a/activerecord/lib/active_record/type/unsigned_integer.rb
+++ b/activerecord/lib/active_record/type/unsigned_integer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Type
class UnsignedInteger < ActiveModel::Type::Integer # :nodoc:
diff --git a/activerecord/lib/active_record/type_caster.rb b/activerecord/lib/active_record/type_caster.rb
index f1686e4913..dbe91dc12b 100644
--- a/activerecord/lib/active_record/type_caster.rb
+++ b/activerecord/lib/active_record/type_caster.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_record/type_caster/map"
require "active_record/type_caster/connection"
diff --git a/activerecord/lib/active_record/type_caster/connection.rb b/activerecord/lib/active_record/type_caster/connection.rb
index 9f7bbe8843..4f4570db58 100644
--- a/activerecord/lib/active_record/type_caster/connection.rb
+++ b/activerecord/lib/active_record/type_caster/connection.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module TypeCaster
class Connection # :nodoc:
diff --git a/activerecord/lib/active_record/type_caster/map.rb b/activerecord/lib/active_record/type_caster/map.rb
index 9f79723125..fd3477a826 100644
--- a/activerecord/lib/active_record/type_caster/map.rb
+++ b/activerecord/lib/active_record/type_caster/map.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module TypeCaster
class Map # :nodoc:
diff --git a/activerecord/lib/active_record/validations.rb b/activerecord/lib/active_record/validations.rb
index 9633f226f0..4727221774 100644
--- a/activerecord/lib/active_record/validations.rb
+++ b/activerecord/lib/active_record/validations.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
# = Active Record \RecordInvalid
#
diff --git a/activerecord/lib/active_record/validations/absence.rb b/activerecord/lib/active_record/validations/absence.rb
index 641d041f3d..57fbdb92ee 100644
--- a/activerecord/lib/active_record/validations/absence.rb
+++ b/activerecord/lib/active_record/validations/absence.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Validations
class AbsenceValidator < ActiveModel::Validations::AbsenceValidator # :nodoc:
diff --git a/activerecord/lib/active_record/validations/associated.rb b/activerecord/lib/active_record/validations/associated.rb
index c695965d7b..d7752b428b 100644
--- a/activerecord/lib/active_record/validations/associated.rb
+++ b/activerecord/lib/active_record/validations/associated.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Validations
class AssociatedValidator < ActiveModel::EachValidator #:nodoc:
diff --git a/activerecord/lib/active_record/validations/length.rb b/activerecord/lib/active_record/validations/length.rb
index 0e0cebce4a..82a17b4807 100644
--- a/activerecord/lib/active_record/validations/length.rb
+++ b/activerecord/lib/active_record/validations/length.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Validations
class LengthValidator < ActiveModel::Validations::LengthValidator # :nodoc:
diff --git a/activerecord/lib/active_record/validations/presence.rb b/activerecord/lib/active_record/validations/presence.rb
index 7cfd55f516..a8f8bc6b02 100644
--- a/activerecord/lib/active_record/validations/presence.rb
+++ b/activerecord/lib/active_record/validations/presence.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Validations
class PresenceValidator < ActiveModel::Validations::PresenceValidator # :nodoc:
diff --git a/activerecord/lib/active_record/validations/uniqueness.rb b/activerecord/lib/active_record/validations/uniqueness.rb
index 154cf5f1a4..86eeb5d7c5 100644
--- a/activerecord/lib/active_record/validations/uniqueness.rb
+++ b/activerecord/lib/active_record/validations/uniqueness.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveRecord
module Validations
class UniquenessValidator < ActiveModel::EachValidator # :nodoc:
diff --git a/activerecord/lib/active_record/version.rb b/activerecord/lib/active_record/version.rb
index 146cfacc18..78e9169b2e 100644
--- a/activerecord/lib/active_record/version.rb
+++ b/activerecord/lib/active_record/version.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require_relative "gem_version"
module ActiveRecord