Question

以下是我的模型结构:

A User has and belongs to many groups
A Group has many subscriptions
A Group has and belongs to many users
A Group has many GroupAdmins
A Subscription belongs to a group
A GroupAdmin belongs to a user
A GroupAdmin belongs to a Group

当我查询 DB (使用主动记录) 时, 我应该能够做这样的事情:

u = User.find 47238

在我用户模型中,我有一个方法叫做订阅:

def subscriptions
    self.groups.where(:status =>  active ).collect { |group| group.subscriptions.where("subscriptions.status = ? AND subscriptions.expiration_date > ?",  active , "#{Time.zone.now}").last  }.flatten
  end

然后继续我的查询:

u.subscriptions.first.group.group_admins

上面给我一个组的记录, 用户代号我无时无刻不在查询。但出于某种原因, 当我在组内运行这个方法时,

def is_group_admin?(user)
    self.group_admins.include? user
  end

工作守则:

def is_admin?(user)
    self.group_admins.collect { |ga| ga.user }.include? user
  end

Answer 1

group_admins 返回组Admin 对象的集合。它们可能( 通过其用户_ id) 与用户相对应, 但实际上不是用户, 所以 group_admins. 包括? (user) 只能返回错误。

取决于您在做些什么,您可以调用 包括? on group_admins.call {ga_ga_ga_ga.user__/code> 或搜索具有相应 user_id 值的群集Admin。

友情链接