Question

这是我的模型结构：

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

当我查询数据库（使用活动记录）时，我应该可以这样做：

u = User.find 47238

在我的用户模型中，我有一个名为subscriptions的方法：

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

然后继续查询：

u.subscriptions.first.group.group_admins

以上为我返回一个组的记录和我最初查询的用户ID ..但由于某种原因，当我在Group I中运行此方法时，返回false：

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

工作代码：

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

Answer 1

group_admins返回GroupAdmin对象的集合。这些可能（通过他们的user_id）对应用户，但他们实际上不是用户，因此group_admins.include?(user)只能返回false。

根据您的工作情况，您可以在include?上致电group_admins.collect {|ga| ga.user}或搜索具有相应user_id值的GroupAdmin。

Rails 3：ActiveRecord结果和Array #include？

1 个答案: