I've done it myself by using a very simple JSONField class, but I'm looking into using PostgreSQL HStore for a next iteration, as it allows me to search the models by attributes, something the JSON field doesn't.

Celery natively pickles the arguments to the background callable. Discussion of why we didn't just pass numerical IDs around is covered in the original article's discussion threads.

promiscuous |prəˈmiskyo͞oəs| 2. demonstrating or implying an undiscriminating or unselective approach; indiscriminate or casual: "the city fathers were promiscuous with their honours." • consisting of a wide range of different things: Americans are free to pick and choose from a promiscuous array of values and behaviour.

Hardly sexist. In this context I was referring to the more flexible and less restrictive use of models. See the comment threads on the original post for additional detail.

If you really want to raise that subject I can highly recommend a few good E3 video game trailers for you to comment on. ;P