Problem during validation

Hi..I need some advice:

A formular which includes 3 partials
The partial will be chosen by userinput stored in a session

def new
   @booking =
   @booking_partial = partial_choice(session[:pre][:fahrt]) # 1,2 or 3

this works fine, but if the validation fails the partial will not be
shown again..!

Looks like the 'partial_choice' is not getting information then. I
dont see the point where to feed that info in again.

Thanks for your help

When your save fails, are you re-seeding the @booking_partial value?

def create
    # the happy path
    @booking_partial = blah blah blah
    render :action => 'new'