Rails - Aug 2006 - How to get the right form to retry for valid input

I have a situation where I have several different methods that put up  
forms for the user that all update various parts of the same model.  
They could all go through the same "update" method, with a structure  
at the end like:

   if at-variable.update_attributes(parms)
     flash - it worked
   else
     render action => "The form that got us here"
   end

however, its not obvious how to get back to the right form to re-try  
for valid input. I could set a session variable or pass the form name  
in a hidden field, but that seems kind of clunky. And setting up  
matching Form1 - Update1, Form2 - Update2, etc. sets of methods seems  
very non-DRY when the only difference between the updates is the  
final render action. Is there a normal "railsy" way of setting this
up?

Thanks,
Steve