我該如何處理這個活動記錄驗證？

Question

我有三個型號，user，message和message_reply：

#user.rb 

class User < ActiveRecord::Base 
    has_many :message_replies 
    has_many :sent_messages, class_name: "Message", foreign_key: :sendor_id 
    has_many :received_messages, class_name: "Message", foreign_key: :receiver_id 
end 


#message.rb 

class Message < ActiveRecord::Base 
    belongs_to :Sendor, class_name: "user", foreign_key: :sendor_id 
    belongs_to :Receiver, class_name: "user", foreign_key: :receiver_id 
    has_many :message_replies 
end 

#message_reply.rb 

class MessageReply < ActiveRecord::Base 
    belongs_to :user 
    belongs_to :message 
end 

我想驗證在MessageReply的:user_id要麼是sendor_id或Message實例receiver_id，這MessageReply實例所屬。

Answer 1

您使用custom validation方法並在您的MessageReply類或任何您認爲合適的位置實施邏輯。

validates :check_user 

def check_user 
    [custom logic] 
end