ActiveRecord Associations module Associations Ruby on Rails 4.0.13 Since v2.2.3 Available in: v2.2.3 v2.3.18 v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2 Compare with: … v2.2.3 v2.3.18 v3.0.20 v3.1.12 v3.2.22.5 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2 Active Record Belongs To Association Active Record Belongs To Polymorphic Association Active Record Has And Belongs To Many Association Active Record Has Many Association Active Record Has Many Through Association Active Record Belongs To Has One Association Active Record Has One Through Association Active Record Through Association Namespace Modules ActiveRecord::Associations::ClassMethods Classes ActiveRecord::Associations::CollectionProxy Used by Included by (1) ActiveRecord::Base
