ruby-on-rails - 如何在这两个 Rails 模型之间建立关系

Question

我有 2 个模型：User并且PrivateMessage必须关联（因为用户有许多私人消息作为接收者和发送者，私人消息属于用户）

这是我的private_messages表结构：

private_messages:
  sender_id:integer
  reciever_id:integer
  title:string
  message:text

我很难理解如何为发件人用户和收件人用户连接相同的消息，现在我的模型代码如下所示：

class User < ActiveRecord:Base
  has_many :private_messages
end

和

class PrivateMessage < ActiveRecord::Base
  belongs_to :user, :through => :sender_id
  belongs_to :user, :through => :reciever_id
end

那是对的吗？

Answer 1

你必须重命名你的关联来区分它们：

class PrivateMessage < ActiveRecord::Base
  belongs_to :sender, :class_name => 'User', :foreign_key => 'sender_id'
  belongs_to :receiver, :class_name => 'User', :foreign_key => 'receiver_id'
end

class User < ActiveRecord::Base
  has_many :sent_messages, :class_name => 'PrivateMessage', :foreign_key => 'sender_id', :dependent => :destroy
  has_many :received_messages, :class_name => 'PrivateMessage', :foreign_key => 'receiver_id', :dependent => :destroy
end