Rails polymorphic的使用和理解

class Person < ActiveRecord::Base  has_one :address, :as => :addressableendclass Company < ActiveRecord::Base  has_one :address, :as => :addressableendclass Address < ActiveRecord::Base belongs_to :addressable, :polymorphic => trueend

Address 有adressable_id addressable_type其中，addressable_type可以为Company或者Person