search for: redirect_to_404

Hi community, as I''m a previous PHP and especially symfony programmer, I often try to find features of symfony in rails. Now I''m looking for a method which forwards to a 404 error page (but with stack trace and so on in development mode). I tried to manually render public/404.html, but if I do so, I miss the stack trace. Is there a method like this or are rails programmers using