I want to change my layout based on whether or not the current user is an admin. So I made a simple method to check if current user is admin, I then call that method in application controller. I keep getting the following error:

undefined method `is_admin?' for ApplicationController:Class

My code looks like this:

class ApplicationController < ActionController::Base
  protect_from_forgery

  helper_method :current_user, :is_admin?


  if is_admin?
   layout 'admin'
  end

  .....

  protected

  .....

  def is_admin?
    if current_user.user_role == 'admin'
      return true
    end
  end

end

How should I be doing this?

Thanks