title: Controller name at error 500?
body: <p>How can I get the controller_name, action_name at the moment of error 500?
  I am trying to detect where the error occurs at my rails app</p>
  
  <p>I send the error by email, but I need more details, any idea? what's the common way of doing this? is there a good gem for this? or what's the recommended way?</p>