[Rails] model with no primary key

Hi,

I have looked around quite a bit, and haven't found any workable
solution to this.

I am accessing an external/remote database from my rails app, in order
to update a categories table.

I cannot change the table structure of the remote database. it has a
categories table with an id field but has a one to one relationship
with a descriptions table.

The descriptions table has no primary key, only a categories_id.

Setting up a one-to-one relationship in my model allows me to load the
description along with the category. But I need to be able to create
a new category and description and cannot find a way around creating
an ActiveRecord object without a primary key.

Grateful for any suggestion of how to do this. I am wondering if I
can use sql from within the model, but not quite sure how this would
be done.

Tony

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