diff options
Diffstat (limited to 'activerecord')
10 files changed, 54 insertions, 36 deletions
diff --git a/activerecord/lib/active_record/associations/alias_tracker.rb b/activerecord/lib/active_record/associations/alias_tracker.rb index 096f016976..358cdabc7f 100644 --- a/activerecord/lib/active_record/associations/alias_tracker.rb +++ b/activerecord/lib/active_record/associations/alias_tracker.rb @@ -6,22 +6,16 @@ module ActiveRecord module Associations # Keeps track of table aliases for ActiveRecord::Associations::JoinDependency class AliasTracker # :nodoc: - def self.create(connection, initial_table) - aliases = Hash.new(0) - aliases[initial_table] = 1 - new(connection, aliases) - end - - def self.create_with_joins(connection, initial_table, joins) + def self.create(connection, initial_table, joins) if joins.empty? - create(connection, initial_table) + aliases = Hash.new(0) else aliases = Hash.new { |h, k| h[k] = initial_count_for(connection, k, joins) } - aliases[initial_table] = 1 - new(connection, aliases) end + aliases[initial_table] = 1 + new(connection, aliases) end def self.initial_count_for(connection, name, table_joins) diff --git a/activerecord/lib/active_record/associations/association_scope.rb b/activerecord/lib/active_record/associations/association_scope.rb index 6118cef913..11967e0571 100644 --- a/activerecord/lib/active_record/associations/association_scope.rb +++ b/activerecord/lib/active_record/associations/association_scope.rb @@ -23,8 +23,7 @@ module ActiveRecord reflection = association.reflection scope = klass.unscoped owner = association.owner - alias_tracker = AliasTracker.create(klass.connection, scope.table.name) - chain = get_chain(reflection, association, alias_tracker) + chain = get_chain(reflection, association, scope.alias_tracker) scope.extending! reflection.extensions add_constraints(scope, owner, chain) diff --git a/activerecord/lib/active_record/associations/join_dependency.rb b/activerecord/lib/active_record/associations/join_dependency.rb index 23741b2f6a..b70b680885 100644 --- a/activerecord/lib/active_record/associations/join_dependency.rb +++ b/activerecord/lib/active_record/associations/join_dependency.rb @@ -90,8 +90,8 @@ module ActiveRecord # associations # => [:appointments] # joins # => [] # - def initialize(base, table, associations, joins, eager_loading: true) - @alias_tracker = AliasTracker.create_with_joins(base.connection, table.name, joins) + def initialize(base, table, associations, alias_tracker, eager_loading: true) + @alias_tracker = alias_tracker @eager_loading = eager_loading tree = self.class.make_tree associations @join_root = JoinBase.new(base, table, build(tree, base)) diff --git a/activerecord/lib/active_record/connection_adapters/connection_specification.rb b/activerecord/lib/active_record/connection_adapters/connection_specification.rb index 29542f917e..508132accb 100644 --- a/activerecord/lib/active_record/connection_adapters/connection_specification.rb +++ b/activerecord/lib/active_record/connection_adapters/connection_specification.rb @@ -183,13 +183,25 @@ module ActiveRecord raise(AdapterNotSpecified, "database configuration does not specify adapter") unless spec.key?(:adapter) + # Require the adapter itself and give useful feedback about + # 1. Missing adapter gems and + # 2. Adapter gems' missing dependencies. path_to_adapter = "active_record/connection_adapters/#{spec[:adapter]}_adapter" begin require path_to_adapter - rescue Gem::LoadError => e - raise Gem::LoadError, "Specified '#{spec[:adapter]}' for database adapter, but the gem is not loaded. Add `gem '#{e.name}'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord)." rescue LoadError => e - raise LoadError, "Could not load '#{path_to_adapter}'. Make sure that the adapter in config/database.yml is valid. If you use an adapter other than 'mysql2', 'postgresql' or 'sqlite3' add the necessary adapter gem to the Gemfile.", e.backtrace + # We couldn't require the adapter itself. Raise an exception that + # points out config typos and missing gems. + if e.path == path_to_adapter + # We can assume that a non-builtin adapter was specified, so it's + # either misspelled or missing from Gemfile. + raise e.class, "Could not load the '#{spec[:adapter]}' Active Record adapter. Ensure that the adapter is spelled correctly in config/database.yml and that you've added the necessary adapter gem to your Gemfile.", e.backtrace + + # Bubbled up from the adapter require. Prefix the exception message + # with some guidance about how to address it and reraise. + else + raise e.class, "Error loading the '#{spec[:adapter]}' Active Record adapter. Missing a gem it depends on? #{e.message}", e.backtrace + end end adapter_method = "#{spec[:adapter]}_connection" diff --git a/activerecord/lib/active_record/relation.rb b/activerecord/lib/active_record/relation.rb index 3517091a6e..1f59a0c53a 100644 --- a/activerecord/lib/active_record/relation.rb +++ b/activerecord/lib/active_record/relation.rb @@ -551,6 +551,10 @@ module ActiveRecord limit_value || offset_value end + def alias_tracker(joins = []) # :nodoc: + ActiveRecord::Associations::AliasTracker.create(connection, table.name, joins) + end + protected def load_records(records) diff --git a/activerecord/lib/active_record/relation/finder_methods.rb b/activerecord/lib/active_record/relation/finder_methods.rb index c92d5a52f4..6e07402979 100644 --- a/activerecord/lib/active_record/relation/finder_methods.rb +++ b/activerecord/lib/active_record/relation/finder_methods.rb @@ -310,12 +310,12 @@ module ActiveRecord return false if !conditions || limit_value == 0 - relation = self unless eager_loading? - relation ||= apply_join_dependency(self, construct_join_dependency(eager_loading: false)) - - return false if ActiveRecord::NullRelation === relation + if eager_loading? + relation = apply_join_dependency(construct_join_dependency(eager_loading: false)) + return relation.exists?(conditions) + end - relation = construct_relation_for_exists(relation, conditions) + relation = construct_relation_for_exists(conditions) skip_query_cache_if_necessary { connection.select_value(relation.arel, "#{name} Exists") } ? true : false rescue ::RangeError @@ -366,17 +366,16 @@ module ActiveRecord # preexisting join in joins_values to categorizations (by way of # the `has_many :through` for categories). # - join_dependency = construct_join_dependency(joins_values) + join_dependency = construct_join_dependency - aliases = join_dependency.aliases - relation = select aliases.columns - relation = apply_join_dependency(relation, join_dependency) + relation = apply_join_dependency(join_dependency) + relation._select!(join_dependency.aliases.columns) yield relation, join_dependency end - def construct_relation_for_exists(relation, conditions) - relation = relation.except(:select, :distinct, :order)._select!(ONE_AS_ONE).limit!(1) + def construct_relation_for_exists(conditions) + relation = except(:select, :distinct, :order)._select!(ONE_AS_ONE).limit!(1) case conditions when Array, Hash @@ -388,17 +387,19 @@ module ActiveRecord relation end - def construct_join_dependency(joins = [], eager_loading: true) + def construct_join_dependency(eager_loading: true) including = eager_load_values + includes_values - ActiveRecord::Associations::JoinDependency.new(klass, table, including, joins, eager_loading: eager_loading) + ActiveRecord::Associations::JoinDependency.new( + klass, table, including, alias_tracker(joins_values), eager_loading: eager_loading + ) end def construct_relation_for_association_calculations - apply_join_dependency(self, construct_join_dependency(joins_values)) + apply_join_dependency(construct_join_dependency) end - def apply_join_dependency(relation, join_dependency) - relation = relation.except(:includes, :eager_load, :preload).joins!(join_dependency) + def apply_join_dependency(join_dependency) + relation = except(:includes, :eager_load, :preload).joins!(join_dependency) if using_limitable_reflections?(join_dependency.reflections) relation diff --git a/activerecord/lib/active_record/relation/merger.rb b/activerecord/lib/active_record/relation/merger.rb index 03824ffff9..ebc72d28fd 100644 --- a/activerecord/lib/active_record/relation/merger.rb +++ b/activerecord/lib/active_record/relation/merger.rb @@ -122,7 +122,7 @@ module ActiveRecord end join_dependency = ActiveRecord::Associations::JoinDependency.new( - other.klass, other.table, joins_dependency, [] + other.klass, other.table, joins_dependency, other.alias_tracker ) relation.joins! rest diff --git a/activerecord/lib/active_record/relation/query_methods.rb b/activerecord/lib/active_record/relation/query_methods.rb index e76ad05b71..fb5beeffef 100644 --- a/activerecord/lib/active_record/relation/query_methods.rb +++ b/activerecord/lib/active_record/relation/query_methods.rb @@ -1013,7 +1013,7 @@ module ActiveRecord join_list = join_nodes + convert_join_strings_to_ast(manager, string_joins) join_dependency = ActiveRecord::Associations::JoinDependency.new( - klass, table, association_joins, join_list + klass, table, association_joins, alias_tracker(join_list) ) joins = join_dependency.join_constraints(stashed_association_joins, join_type) diff --git a/activerecord/test/cases/connection_specification/resolver_test.rb b/activerecord/test/cases/connection_specification/resolver_test.rb index 3fa0ca8366..5b80f16a44 100644 --- a/activerecord/test/cases/connection_specification/resolver_test.rb +++ b/activerecord/test/cases/connection_specification/resolver_test.rb @@ -19,7 +19,7 @@ module ActiveRecord spec "ridiculous://foo?encoding=utf8" end - assert_match "Could not load 'active_record/connection_adapters/ridiculous_adapter'", error.message + assert_match "Could not load the 'ridiculous' Active Record adapter. Ensure that the adapter is spelled correctly in config/database.yml and that you've added the necessary adapter gem to your Gemfile.", error.message end # The abstract adapter is used simply to bypass the bit of code that diff --git a/activerecord/test/cases/finder_test.rb b/activerecord/test/cases/finder_test.rb index 55496147c1..2f6d708092 100644 --- a/activerecord/test/cases/finder_test.rb +++ b/activerecord/test/cases/finder_test.rb @@ -9,6 +9,7 @@ require "models/company" require "models/tagging" require "models/topic" require "models/reply" +require "models/rating" require "models/entrant" require "models/project" require "models/developer" @@ -244,6 +245,13 @@ class FinderTest < ActiveRecord::TestCase assert_equal true, author.unique_categorized_posts.includes(:special_comments).order("comments.tags_count DESC").limit(1).exists? end + def test_exists_should_reference_correct_aliases_while_joining_tables_of_has_many_through_association + assert_nothing_raised do + developer = developers(:david) + developer.ratings.includes(comment: :post).where(posts: { id: 1 }).exists? + end + end + def test_exists_with_empty_table_and_no_args_given Topic.delete_all assert_equal false, Topic.exists? |