title: authorization rails_admin with pundit
body: <p>I use pundit gem to authorization.</p>
  
  <p>In my file <code>config/initializers/rails_admin.rb</code></p>
  
  <pre><code>RailsAdmin.config do |config|
    config.authorize_with :pundit
  
    config.current_user_method(&amp;:current_user)
    ......
  end
  </code></pre>
  
  <p>I follow the instructions in <code>https://github.com/sudosu/rails_admin_pundit</code>
  But in when run code, error :</p>
  
  <pre><code>protected method `policy' called for #&lt;Rails_Admin::MainController
  </code></pre>
  
  <p>I use rails_admin 0.8.1</p>
  
  <p>Please guide me use pundit in rails_admin ( tutorial, examle, ...) </p>