Error handleing with redirect_to

I’m sketching out a error handler, something like

if cando = false
redirect_to( :controller => Oops,
:action => ‘accessdenied’,
:type => ‘alarm’,
:message => ‘no_permission_to_view’,
:return_to => saved_url,


Is this an internal redirection or does it immedate send that url to the
browser as

What I want is the message sent to the user with a view custom for the
action parameter. It would be nice it if it was a popup rather than a
new page, but I’ll live with that.

Am I on the wrong track here?
I seem to be getting problems with routing.

The bitterness of poor quality lingers long after the sweetness of
meeting schedules is forgotten.
–Kathleen Byle, Sandia National Laboratories