[Rails] Abstracting a form

If you wanted to abstract or wrap a form in Rails, how would you do
it?

The purpose of this is to capture form-specific behavior--
preprocessing, basically--that doesn't belong in a model.

Django, for example, works at this level:

http://docs.djangoproject.com/en/1.2/topics/forms/

Maybe a controller filter or private method would accomplish this, but
I don't want to make the controller "fat."

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