Prevent redirection if possible

This will just show the flash message on prevent the browser from changing the location. Works great with Turbolinks!

app/controllers/application_controller.rb

@@ -15,7 +15,7 @@ class ApplicationController < ActionController::Base
   end
 
   def render_not_authorized
-    redirect_to(:root, alert: t('application.not_authorized'))
+    redirect_to(request.referrer || :root, alert: t('application.not_authorized'))
   end
   private :render_not_authorized