From 2e3bba3e3af8c41e833cced61f0449ad73c947cc Mon Sep 17 00:00:00 2001 From: Ryan Kerr Date: Sat, 30 Mar 2019 00:35:16 -0400 Subject: Fix callbacks on has_many :through associations (#33249) When adding a child record via a has_many :through association, build_through_record would previously build the join record, and then assign the child record and source_type option to it. Because the before_add and after_add callbacks are called as part of build, however, this caused the callbacks to receive incomplete records, specifically without the other end of the has_many :through association. Collecting all attributes before building the join record ensures the callbacks receive the fully constructed record. --- .../associations/has_many_through_associations_test.rb | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'activerecord/test/cases/associations') diff --git a/activerecord/test/cases/associations/has_many_through_associations_test.rb b/activerecord/test/cases/associations/has_many_through_associations_test.rb index 67e013c6e0..fa540c9dab 100644 --- a/activerecord/test/cases/associations/has_many_through_associations_test.rb +++ b/activerecord/test/cases/associations/has_many_through_associations_test.rb @@ -1474,6 +1474,24 @@ class HasManyThroughAssociationsTest < ActiveRecord::TestCase assert_equal [subscription2], post.subscriptions.to_a end + def test_child_is_visible_to_join_model_in_add_association_callbacks + [:before_add, :after_add].each do |callback_name| + sentient_treasure = Class.new(Treasure) do + def self.name; "SentientTreasure"; end + + has_many :pet_treasures, foreign_key: :treasure_id, callback_name => :check_pet! + has_many :pets, through: :pet_treasures + + def check_pet!(added) + raise "No pet!" if added.pet.nil? + end + end + + treasure = sentient_treasure.new + assert_nothing_raised { treasure.pets << pets(:mochi) } + end + end + private def make_model(name) Class.new(ActiveRecord::Base) { define_singleton_method(:name) { name } } -- cgit v1.2.3