Rails - Sep 2007 - My controller became fat trying to handle multiple models- ?

Hello all.

I am experiencing something that has to be fairly common in the rails
world, but I haven''t found a clean solution yet.

I have a SignupController that handles multiple models in a single form.
Those models are User, UserProfile, CreditCard, Subscription, and Order.
When the form is filled out and posted, I want to do exactly what I
would do if the form was only for a single model:
(1) Build the object from params[:model]
(2) Save the object, rendering errors to the form page if they exists
(otherwise flash ''Success'').

Why is this so tough when dealing with multiple models?  Here is what I
am doing (and this is how I know it''s too complicated and there must be
a better way):
(1) Building each object (@user = User.new(params[:user]), @cc
CreditCard.new(params[:cc]), etc).
(2) http://pastie.caboo.se/94819
(3) I haven''t gotten to manually building an ''errors''
hash yet.

I would love to hear some feedback.
Many thanks,
Chris
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