vendor/rails/activerecord/test/models/pirate.rb

   1 class Pirate < ActiveRecord::Base
   2   belongs_to :parrot
   3   has_and_belongs_to_many :parrots
   4   has_many :treasures, :as => :looter
   5
   6   has_many :treasure_estimates, :through => :treasures, :source => :price_estimates
   7
   8   validates_presence_of :catchphrase
   9 end