如何在另一个类中多次引用同一个类？

Question

如何使用Mongoid在另一个类中引用同一个类两次（或多次）？

class User
  include Mongoid::Document
  field :email

  references_many :messages, :stored_as => :array #all messages where the user acts as a sender
  references_many :messages, :stored_as => :array #all messages where the user acts as a receiver
end

class Message
  include Mongoid::Document
  field :Text

  references_one :user #this should be the sender
  references_one :user #this should be the receiver
end

Answer 1

references_many：sent_messages，：stored_as =＆gt; ：array，：class_name =＆gt; '消息'

和

references_one：sender，：class_name =＆gt; '用户'