undefined method `authenticate_admin_user!' when access activeadmin

Question

I cannot get into admin panel after updating my activeadmin, my admin users are store in a table called admin_users.

      NoMethodError in Admin::DashboardController#index

      undefined method `authenticate_admin_user!' for #Admin::DashboardController:0x007fe46c3d99d0
      Rails.root: /Users/jianbo/Documents/Aptana Studio 3 Workspace/iv

      Application Trace | Framework Trace | Full Trace
      activeadmin (0.6.2) lib/active_admin/base_controller.rb:40:in authenticate_active_admin_user'
      activesupport (3.2.15) lib/active_support/callbacks.rb:474:inblock in run_3994836635519503653__process_action__2211030722258422070__callbacks'
      activesupport (3.2.15) lib/active_support/callbacks.rb:215:in `block in conditionalcallback_around_863'

Answer 1

As part of ActiveAdmin configuration you need to define a method on ApplicationController that requires authentication and determines whether the user is an admin (and hence can access ActiveAdmin pages). The name of this method can be controlled by this setting in the ActiveAdmin initializers:

config.authentication_method = :authenticate_admin_user!

The default name for this method is authenticate_admin_user!

If you already have a method that authenticates a user and confirms that they are an admin, just update the config to use that method. Otherwise you'll need to create this method on the ApplicationController