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-rw-r--r--activerecord/CHANGELOG.md8
-rw-r--r--activerecord/lib/active_record/autosave_association.rb5
-rw-r--r--activerecord/test/cases/associations/has_many_through_associations_test.rb19
3 files changed, 29 insertions, 3 deletions
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index fc726d6519..efc10913f4 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,11 @@
+* `has_many :through` associations will no longer save the through record
+ twice when added in an `after_create` callback defined before the
+ associations.
+
+ Fixes #3798.
+
+ *Sean Griffin*
+
* Add `bin/rake db:purge` task to empty the current database.
*Yves Senn*
diff --git a/activerecord/lib/active_record/autosave_association.rb b/activerecord/lib/active_record/autosave_association.rb
index b3c3e26c9f..dd92e29199 100644
--- a/activerecord/lib/active_record/autosave_association.rb
+++ b/activerecord/lib/active_record/autosave_association.rb
@@ -184,9 +184,7 @@ module ActiveRecord
before_save :before_save_collection_association
define_non_cyclic_method(save_method) { save_collection_association(reflection) }
- # Doesn't use after_save as that would save associations added in after_create/after_update twice
- after_create save_method
- after_update save_method
+ after_save save_method
elsif reflection.has_one?
define_method(save_method) { save_has_one_association(reflection) } unless method_defined?(save_method)
# Configures two callbacks instead of a single after_save so that
@@ -364,6 +362,7 @@ module ActiveRecord
raise ActiveRecord::Rollback unless saved
end
+ @new_record_before_save = false
end
# reconstruct the scope now that we know the owner's id
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 8641584c0c..6895df73c1 100644
--- a/activerecord/test/cases/associations/has_many_through_associations_test.rb
+++ b/activerecord/test/cases/associations/has_many_through_associations_test.rb
@@ -1139,4 +1139,23 @@ class HasManyThroughAssociationsTest < ActiveRecord::TestCase
assert_equal 2, post.lazy_readers_unscope_skimmers.to_a.size
assert_equal 2, post.lazy_people_unscope_skimmers.to_a.size
end
+
+ class ClubWithCallbacks < ActiveRecord::Base
+ self.table_name = 'clubs'
+ after_create :add_a_member
+
+ has_many :memberships, inverse_of: :club, foreign_key: :club_id
+ has_many :members, through: :memberships
+
+ def add_a_member
+ members << Member.last
+ end
+ end
+
+ def test_has_many_with_callback_before_association
+ Member.create!
+ club = ClubWithCallbacks.create!
+
+ assert_equal 1, club.reload.memberships.count
+ end
end