ActiveRecord::Associations::ClassMethods::HasAndBelongsToManyAssocationArray ^(Module)

     # File vendor/activerecord/lib/active_record/associations.rb, line 480
480:           def <<(association)
481:             @owner.send("add_" + @collection_name, association)
482:             super association
483:           end

     # File vendor/activerecord/lib/active_record/associations.rb, line 485
485:           def delete(association)
486:             @owner.send("remove_" + @collection_name, association)
487:             super association
488:           end