I'm fooling around with comparing instances of different models, trying to make a unified stream of instances that can be sorted by date according to a certain datetime attribute on each model. I thought I'd define a __cmp__ method on each model in question, that would provide the appropriate attribute, rather than writing a sort key function. I started off just comparing instances of different models, to see what would happen, and found that some instances evaluate to 'greater than' other instances, but I don't know what the criteria is. It's not foreign key, and looking at the source I don't see anything defined for Model except for __eq__ and __ne__. Can someone enlighten?
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