DMZ supports not using join tables for $has_one relationships. That's probably the #1 feature about it, and what prompted me to rewrite DM the first time. It's referred to as "in-table foreign keys" in the docs. It does it without a single line of code on the developer's part.
Also, I just made a tiny change to DMZ's $id in the constructor trick (checking for empty, like yours), because I had missed it. I just replaced the ZIP on the server, so you can grab it again if you care. (The only difference is that new Object(0) won't run a query now.)
My version of the docs has had some significant updates from stensi's originals. It really pays to read through them, especially this release.
My plan is to go ahead and release 1.4.0 by Monday evening (US EDT), because I won't be around for a few days, and I really want to get this release in everyone's hands. Apparently, only about 10 people want to test the beta release. Maybe I'll trick them into testing it this way! ;-)
