从 has_many 关系继承范围

发布于 2024-10-19 05:06:30 字数 529 浏览 4 评论 0原文

我正在使用 ruby on Rails 3.1，有 2 个模型、一个事件和一个组。每个事件都有_many组，但必须至少有一个“主”组，其中列：is_master => true

Class Group < ActiveRecord::Base
  has_many :users
  belongs_to :event
  scope :master, where (:is_master => true)
end

Class Event< ActiveRecord::Base
  has_many :groups
  def master_group
     groups.master
  end
end

我希望能够将主组的所有属性默认为事件，因此，例如， event.users.count 应与 event.master_group.users.count 相同。

有什么办法可以做这样的事情吗？我可以做一个 has_many :through =>主组？我是否以错误的方式处理这个问题？

谢谢！

原文

I am using ruby on rails 3.1 and have 2 models, an event and a group. Each event has_many groups, but has to have at least one "master" group, where the column :is_master => true

Class Group < ActiveRecord::Base
  has_many :users
  belongs_to :event
  scope :master, where (:is_master => true)
end

Class Event< ActiveRecord::Base
  has_many :groups
  def master_group
     groups.master
  end
end

I want to be able to default all properties of the master group to the event, so for example, event.users.count should be the same as event.master_group.users.count.

Is there any way to do something like this? Can I do a has_many :through => master_group? Am I approaching this the wrong way?

Thanks!

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