Rails - Aug 2006 - Capturing Validation Errors from Nested Model Creation..

Hello Everyone,
    The subject sort of says it all ;) but, I will explain. Currently I 
have an object (Booking) which, when its created, will also have new 
contacts created everytime with it (for arguements sake). So, I can wrap 
these both in a transaction, however, if any one of the contacts fails 
the validation of the contact model, it will fling up a validation error.

    So, what is the best way to capture this error and return it to the 
page for display ? I thought of trying

    Booking.transaction do
       @allerrors = []
       contact = Contact.new(:first_name =>
params["contact"]["first_name"])

       if not contact.valid?() then
          contact.errors.each {|attr| @allerrors.push(attr) }
       end

       # other stuff goes here

       if @allerrors.empty? and @booking.save then
           @booking.contact = myContacts
            flash[:notice] = ''Booking was successfully
created.''
            redirect_to :action => ''list''
       else
             @booking.errors.each {|attr| @allerrors.push(attr) }
             redirect_to :action => ''new'', :errors =>
@allerrors
       end
    end

    This is a rather contrived example, but I hope you get the idea :) I 
could check the booking''s validation to make sure it always has at
least
one contact, however, that would not help in the case of a booking where 
3 out of the 4 contacts validated ''fine''. I would like to use
the
generic error routines if possible (you know, red box on page view, etc 
etc) but how ?

    Regards
    Stef