Redirect to login screen from users page

Author: nygrenh

app/controllers/users_controller.rb

@@ -9,6 +9,7 @@ class UsersController < ApplicationController
   after_action :remove_x_frame_options_header_when_bare_layout, only: %i[new create show]
 
   def index
+    raise CanCan::AccessDenied if current_user.guest?
     respond_access_denied unless current_user.administrator?
     @users = User.search(params[:search])
   end