This is probably as simple as declaring a ForeignKey and creating the column without actually declaring it as a FOREIGN KEY. That way, you'll get o. Obj_id, o.
Obj will work if the object exists, and--I think--raise an exception if you try to load an object that doesn't actually exist (probably DoesNotExist ).
I'm new to Django, so I don't now if it provides what you want out-of-the-box. I thought of something like this.
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