diff options
| -rw-r--r-- | activerecord/lib/active_record/associations/preloader/association.rb | 4 | ||||
| -rw-r--r-- | activerecord/test/cases/associations/has_many_associations_test.rb | 5 |
2 files changed, 8 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/associations/preloader/association.rb b/activerecord/lib/active_record/associations/preloader/association.rb index 342d9e7a5a..4c7b0e6f07 100644 --- a/activerecord/lib/active_record/associations/preloader/association.rb +++ b/activerecord/lib/active_record/associations/preloader/association.rb @@ -27,7 +27,9 @@ module ActiveRecord end def records_by_owner - @records_by_owner ||= preloaded_records.each_with_object({}) do |record, result| + # owners can be duplicated when a relation has a collection association join + # #compare_by_identity makes such owners different hash keys + @records_by_owner ||= preloaded_records.each_with_object({}.compare_by_identity) do |record, result| owners_by_key[convert_key(record[association_key_name])].each do |owner| (result[owner] ||= []) << record end diff --git a/activerecord/test/cases/associations/has_many_associations_test.rb b/activerecord/test/cases/associations/has_many_associations_test.rb index 545bc77fed..fe7e5dc559 100644 --- a/activerecord/test/cases/associations/has_many_associations_test.rb +++ b/activerecord/test/cases/associations/has_many_associations_test.rb @@ -2932,6 +2932,11 @@ class HasManyAssociationsTest < ActiveRecord::TestCase assert_equal [], reference.ideal_jobs end + def test_has_many_preloading_with_duplicate_records + posts = Post.joins(:comments).preload(:comments).to_a + assert_equal [1, 2], posts.first.comments.map(&:id) + end + private def force_signal37_to_load_all_clients_of_firm |