diff options
3 files changed, 24 insertions, 1 deletions
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md index 487195a2e0..c2f26bce70 100644 --- a/activerecord/CHANGELOG.md +++ b/activerecord/CHANGELOG.md @@ -1,3 +1,10 @@ +* Improved partial writes with HABTM and has many through associations + to fire database query only if relation has been changed. + + Fixes #19663. + + *Mehmet Emin İNAÇ* + * Deprecate passing arguments and block at the same time to `ActiveRecord::QueryMethods#select`. 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 1f264d325a..8c90aea975 100644 --- a/activerecord/lib/active_record/associations/has_many_through_association.rb +++ b/activerecord/lib/active_record/associations/has_many_through_association.rb @@ -86,7 +86,10 @@ module ActiveRecord end def save_through_record(record) - build_through_record(record).save! + association = build_through_record(record) + if association.changed? + association.save! + end ensure @through_records.delete(record.object_id) end diff --git a/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb b/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb index 8aab7cfa47..6bded77eb2 100644 --- a/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb +++ b/activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb @@ -1012,4 +1012,17 @@ class HasAndBelongsToManyAssociationsTest < ActiveRecord::TestCase user = User.create! assert_nothing_raised { user.jobs_pool.clear } end + + def test_has_and_belongs_to_many_while_partial_writes_false + begin + original_partial_writes = ActiveRecord::Base.partial_writes + ActiveRecord::Base.partial_writes = false + developer = Developer.new(name: "Mehmet Emin İNAÇ") + developer.projects << Project.new(name: "Bounty") + + assert developer.save + ensure + ActiveRecord::Base.partial_writes = original_partial_writes + end + end end |