[Rails] How to populate a table with id of selected item from another table

Hi,

I have a "New Expense" form that includes a select field named vendor
that provides a a drop-down list of all vendors.

When a user makes a selection of a vendor-name, that name populates
the vendor field of the new Expense record. I'm happy with the drop-
down list of names, but I'd rather populate the Expense record with
the ID of the vendor.

IMHO, this is a common database problem. Can you point me to a
simple example on the Web for handling this. I've found plenty of
HABTM examples with check-boxes, but none (so far) exactly on point.

Thanks in Advance,
Richard

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