Polymorphic Association
Reference : http://charlesmaxwood.com/ruby-on-rails-restful-links-when-you-dont-know-the-class/ Example : restful routes: map.resources :users map.resources :groups Model Relation: class Post < ActiveRecord::Base belongs_to :owner , :polymorphic => true end class User < ActiveRecord::Base has_many :posts , :as => :owner end class Group has_many :posts , :as => :owner end Now, let’s say that when you show a post, you want to provide a link to the owner of the post when you display it on its show page. You know that because you’ve provided the restful routes in your config/routes.rb file as show above, you get the nice functionality of the user_path and the group_path methods. The problem is that because you don’t know if @post.owner is a user or a group. Documentation : http://railsbrain.com/api/rails-2.3.2/doc/index.html?a=M000261&name=polymorphic_path Thanks, Srikanth