title: Updating Roles in rolify using ActiveAdmin
body: <p>Using Rails 4.0, ActiveAdmin, Rolify and CanCan, Adding and removing user roles via the activeadmin panel does not save (commit to database).</p>
  
  <p>The my <a href="https://gist.github.com/cdesch/7874594" rel="nofollow noreferrer">ActiveAdmin User and User Model</a> look okay as I can list all the roles that apply to a user using check_boxes. Although when adding any roles or removing any roles via the checkboxes the changes do not get applied. </p>
  
  <p><img src="https://i.stack.imgur.com/WTNjl.png" alt="enter image description here"></p>
  
  <p>I get a notification that the user was updated successfully but as I look through the database or render the page, the roles have not been updated.</p>
  
  <p>How can I get the roles to update when the form is saved? </p>
  
  <p>Edit:</p>
  
  <p>Using Devise also.</p>
  
  <p><img src="https://i.stack.imgur.com/SJQod.png" alt="enter image description here"></p>