Rails - Jul 2006 - Check if row already exists?

I''m working on a system that has a series od "bids"
associated with
"posts". Vurrently when a bid is placed I have it creating a new row 
each time in the "bids" table. The bids table has id, post_id, and 
user_id.

The logic is to check to see if a bid already exists with a given 
post_id and user_id. If it does, then just update the "amount" field.
If
it doesn''t, then create a new line. Here''s what I have to
create the
row:

def
    @post = Post.find(params[:post])
    @bid = Bid.new(params[:bid])
    @bid.user_id = @session[''user''].id
    @bid.post_id = @post.id
end

If I try to run a find for a bid with a user_id matching the current 
user I get an error about not being able to find a record with that 
user_id. That''s fine, but I want to then use that result to decide if 
I''m generating a new record or updating an existing one. Any ideas?

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