Question

Here is my model structure:

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

When I query the DB (using active record), I should be able to do something like this:

u = User.find 47238

In my User model I have a method called subscriptions:

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

and then to continue with my query:

u.subscriptions.first.group.group_admins

The above returns me a record of a group and the user id I initally queried on.. but for some reason when I run this method inside of Group I get a false returned:

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

Working Code:

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

Answer 1

group_admins returns a collection of GroupAdmin objects. These may correspond (via their user_id) to a user but they aren’t actually users so group_admins.include?(user) can only return false.

Depending on what you are doing you could call include? on group_admins.collect {|ga| ga.user} or search for a GroupAdmin with the appropriate user_id value.