Rails - Feb 2005 - template for new controller to create data in more than one table

I am trying to replace the "new" scaffolding with my own controller
and view so that I can create data in more than one table in my db
from a single "new" view.
The scaffolding does not allow me to enter values for any of the _id
fields that are keys into my other table. I think that accessing the
values from "new" would be the same as it is done in edit in the
onlamp tutorial - but I dont understand how the rest of "new" should
look. In terms of that tutorial, what I am trying to do is to enter
the recipe category into the category table of my database through the
recipe controller and recipe "new" view, rather than through the
"edit" view. Does anyone have a template that I can build out from, or
any other ideas on how to approach this?

Thanks,
Zach