Rails ActiveRecord 双重关联

发布于 2024-11-27 15:43:37 字数 654 浏览 6 评论 0原文

我有以下两个模型，用户..

class User < ActiveRecord::Base
  has_and_belongs_to_many :sites
end

..和站点：

class Site< ActiveRecord::Base
  has_and_belongs_to_many :users
end

到目前为止还不错。它有效而且非常简单。现在我想向“主要用户”介绍该网站。我将“primary_user_id”添加到网站，并尝试添加第二个关联：

class Site< ActiveRecord::Base
 has_and_belongs_to_many :user

 # my new association that doesn't work...
 has_one :primary_user, :class_name => "User", :conditions => ['id = ?', '{self.primary_user_id}'] 
end

它不喜欢它...现在我知道我可以通过向网站添加方法“primary_user”来伪造此内容，这将起作用，但我的问题是是否可以使用 ActiveRecord 关联以及如何使用？

原文

I have the following two models, User..

class User < ActiveRecord::Base
  has_and_belongs_to_many :sites
end

.. and Site:

class Site< ActiveRecord::Base
  has_and_belongs_to_many :users
end

Up to this point its fine. It works and it's pretty simple.
Now I want to introduce "primary user" to the Site. I add "primary_user_id" to the Site, and trying to add a second association:

class Site< ActiveRecord::Base
 has_and_belongs_to_many :user

 # my new association that doesn't work...
 has_one :primary_user, :class_name => "User", :conditions => ['id = ?', '{self.primary_user_id}'] 
end

It doesn't like it... Now I know that I can fake this by just adding a method "primary_user" to the site and this will work, but my question is whether it is possible to user ActiveRecord associations and how?

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