ruby on rails - Two pages for the same resource - ActiveAdmin

Question

Currently I have User model, which is registered in user.rb as a new resource for ActiveAdmin. Generated page displays all users with scopes (all/journalists/startup_employees). Now I want to create another page for the same resource, and the same scopes, but there should be only records with waiting field set to true (and the previous page should displays only this with :waiting => false). How could I do that? I know I could do that with filters, but I need two separate pages, with two links in menu.

// SOLUTION

It was even easier than advices (thanks guys!):

ActiveAdmin.register User, :as => 'Waitlist User' do
  menu :label => "Waitlist"

  controller do
    def scoped_collection
      User.where(:waitlist => true)
    end
  end

  # code

  scope :all
  scope :journalists
  scope :startup_employees
end

---

ActiveAdmin.register User do
  controller do
    def scoped_collection
      User.where(:waitlist => false)
    end
  end

  # code

  scope :all
  scope :journalists
  scope :startup_employees
end

Answer 1

STI (Single table inheritance) can be used to create multiple "sub-resources" of the same table/parent model in Active admin

1. Add a "type" column in user table as a string

2. Add this to User model to mirror waiting field with type field

   after_commit {|i| update_attribute(:type, waiting ? "UserWaiting" : "UserNotWaiting" )}
   

3. Create the new models UserWaiting and UserNotWaiting

   class UserWaiting < User
   end
   class UserNotWaiting < User
   end
   

4. Create Active Admin resources

   ActiveAdmin.register UserWaiting do
   # ....
   end
   ActiveAdmin.register UserNotWaiting do
   # ....
   end
   

5. You can run a first-time sync in console

   User.all.each {|user| user.save}
   

..............

Another way could be to skip the type column (steps 1,2 and 5) and solve the rest with scopes.

1. Step 3 and 4 above

2. Then create the scopes

   #model/user.rb
   scope :waiting, where(:waiting => true)
   scope :not_waiting, where(:waiting => false)
   

3. Scopes in Active Admin

   #admin/user.rb
   scope :waiting, :default => true
   
   #admin/user_not_waitings.rb
   scope :not_waiting, :default => true
   

Just make sure the other scopes in these two pages are also filtered on waiting/not_waiting