diff options
| -rw-r--r-- | activerecord/CHANGELOG.md | 26 | ||||
| -rw-r--r-- | activerecord/lib/active_record/associations/builder/belongs_to.rb | 20 | ||||
| -rw-r--r-- | activerecord/test/cases/associations/has_many_associations_test.rb | 31 |
3 files changed, 77 insertions, 0 deletions
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md index a8151cd23e..79ca34d89d 100644 --- a/activerecord/CHANGELOG.md +++ b/activerecord/CHANGELOG.md @@ -1,5 +1,31 @@ ## Rails 4.0.0 (unreleased) ## +* Counter caches on associations will now stay valid when attributes are + updated (not just when records are created or destroyed), for example, + when calling +update_attributes+. The following code now works: + + class Comment < ActiveRecord::Base + belongs_to :post, counter_cache: true + end + + class Post < ActiveRecord::Base + has_many :comments + end + + post = Post.create + comment = Comment.create + + post.comments << comment + post.save.reload.comments_count # => 1 + comment.update_attributes(:post_id => nil) + + post.save.reload.comments_count # => 0 + + Updating the id of a +belongs_to+ object with the id of a new object will + also keep the count accurate. + + *John Wang* + * Referencing join tables implicitly was deprecated. There is a possibility that these deprecation warnings are shown even if you don't make use of that feature. You can now disable the feature entirely. diff --git a/activerecord/lib/active_record/associations/builder/belongs_to.rb b/activerecord/lib/active_record/associations/builder/belongs_to.rb index 97b1ff18e2..fbcb21118d 100644 --- a/activerecord/lib/active_record/associations/builder/belongs_to.rb +++ b/activerecord/lib/active_record/associations/builder/belongs_to.rb @@ -21,11 +21,13 @@ module ActiveRecord::Associations::Builder def add_counter_cache_callbacks(reflection) cache_column = reflection.counter_cache_column + foreign_key = reflection.foreign_key mixin.class_eval <<-CODE, __FILE__, __LINE__ + 1 def belongs_to_counter_cache_after_create_for_#{name} record = #{name} record.class.increment_counter(:#{cache_column}, record.id) unless record.nil? + @_after_create_counter_called = true end def belongs_to_counter_cache_before_destroy_for_#{name} @@ -34,10 +36,28 @@ module ActiveRecord::Associations::Builder record.class.decrement_counter(:#{cache_column}, record.id) unless record.nil? end end + + def belongs_to_counter_cache_after_update_for_#{name} + if (@_after_create_counter_called ||= false) + @_after_create_counter_called = false + elsif self.#{foreign_key}_changed? && !new_record? && defined?(#{name.to_s.camelize}) + model = #{name.to_s.camelize} + foreign_key_was = self.#{foreign_key}_was + foreign_key = self.#{foreign_key} + + if foreign_key && model.respond_to?(:increment_counter) + model.increment_counter(:#{cache_column}, foreign_key) + end + if foreign_key_was && model.respond_to?(:decrement_counter) + model.decrement_counter(:#{cache_column}, foreign_key_was) + end + end + end CODE model.after_create "belongs_to_counter_cache_after_create_for_#{name}" model.before_destroy "belongs_to_counter_cache_before_destroy_for_#{name}" + model.after_update "belongs_to_counter_cache_after_update_for_#{name}" klass = reflection.class_name.safe_constantize klass.attr_readonly cache_column if klass && klass.respond_to?(:attr_readonly) diff --git a/activerecord/test/cases/associations/has_many_associations_test.rb b/activerecord/test/cases/associations/has_many_associations_test.rb index 1ddd380f23..781b87741d 100644 --- a/activerecord/test/cases/associations/has_many_associations_test.rb +++ b/activerecord/test/cases/associations/has_many_associations_test.rb @@ -789,6 +789,37 @@ class HasManyAssociationsTest < ActiveRecord::TestCase end end + def test_calling_update_attributes_on_id_changes_the_counter_cache + topic = Topic.order("id ASC").first + original_count = topic.replies.to_a.size + assert_equal original_count, topic.replies_count + + first_reply = topic.replies.first + first_reply.update_attributes(:parent_id => nil) + assert_equal original_count - 1, topic.reload.replies_count + + first_reply.update_attributes(:parent_id => topic.id) + assert_equal original_count, topic.reload.replies_count + end + + def test_calling_update_attributes_changing_ids_doesnt_change_counter_cache + topic1 = Topic.find(1) + topic2 = Topic.find(3) + original_count1 = topic1.replies.to_a.size + original_count2 = topic2.replies.to_a.size + + reply1 = topic1.replies.first + reply2 = topic2.replies.first + + reply1.update_attributes(:parent_id => topic2.id) + assert_equal original_count1 - 1, topic1.reload.replies_count + assert_equal original_count2 + 1, topic2.reload.replies_count + + reply2.update_attributes(:parent_id => topic1.id) + assert_equal original_count1, topic1.reload.replies_count + assert_equal original_count2, topic2.reload.replies_count + end + def test_deleting_a_collection force_signal37_to_load_all_clients_of_firm companies(:first_firm).clients_of_firm.create("name" => "Another Client") |