Attachment_fu multiple uploads has_one relationship

I’ve got a user model that has one photo.
I have a photo model that belongs_to user

I followed this tutorial to have an arbitrary number of users created:
http://www.railsforum.com/viewtopic.php?id=1065

I then followed this tutorial to have multiple file uploads with
attachment_fu:
http://beast.caboo.se/forums/2/topics/870#posts-2484

My parameters look correct. The photos hash has a unique key for each
photo. The users hash has a unique key for each user. What I am trying
to do is link/attach each photo to each user based on the two having
the same key. I can iterate through the photos and users hash and get
the keys but I don’t know how to compare the two.
Anyone care to give me an idea on how I can do this with Ruby’s magic?

scratch this post – I think this shows that I have an app design
issue, not code issue.