如何在另一個班級中多次引用同一班級？

Question

如何使用Mongoid在另一個類中兩次（或多次）引用相同的類？

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 =>：陣列，：CLASS_NAME => '消息'

和

references_one：發送方，：CLASS_NAME => '用戶'