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-rw-r--r--activerecord/lib/active_record/migration/command_recorder.rb2
-rw-r--r--activerecord/lib/active_record/migration/compatibility.rb2
-rw-r--r--activerecord/lib/active_record/migration/join_table.rb2
3 files changed, 6 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/migration/command_recorder.rb b/activerecord/lib/active_record/migration/command_recorder.rb
index f9cf59b283..a3a5e0fa16 100644
--- a/activerecord/lib/active_record/migration/command_recorder.rb
+++ b/activerecord/lib/active_record/migration/command_recorder.rb
@@ -1,3 +1,5 @@
+# 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..d6595c9355 100644
--- a/activerecord/lib/active_record/migration/compatibility.rb
+++ b/activerecord/lib/active_record/migration/compatibility.rb
@@ -1,3 +1,5 @@
+# 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..9abb289bb0 100644
--- a/activerecord/lib/active_record/migration/join_table.rb
+++ b/activerecord/lib/active_record/migration/join_table.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
module ActiveRecord
class Migration
module JoinTable #:nodoc: