module Spree
  class Favorite < ActiveRecord::Base
    belongs_to :product
    belongs_to :user
    validates :user_id, :product_id, :presence => true
    validates :product_id, :uniqueness => { :scope => :user_id, :message => "already marked as favorite" }
    validates :product, :presence => { :message => "is invalid" }, :if => :product_id
  end
end