Using the same action in AJAX calls

Hi *,
I display a form after a link_to_remote where I edit some object
attributes. Actually I need 2 controller actions, edit (this one
displays the form) and do_edit (this one changes the attributes in
the db). I’d like to do the same thing I do for normal non-AJAX
actions with request.post? to use the same action (in my case ‘edit’)
for both, in one case render a partial in the other update the db and
render a partial, or fail the update and redisplay the remote_form_for.
They are both request.xhr? AFAIK, so actually I don’t know how to
solve this one …
Someone already tried ?

ngw