[Answered ]-Django filter sub-class models

(Update: This Answer on a previously asked question is better than what I’ve written below.)

This article explains why this is inefficient in Django — basically, because it would require expensive joins across the tables for all the subclasses. (I’ve written an ORM that does polymorphism like that, and the queries get out of hand very quickly. The Django guys made the right decision here.)

The article describes a method for writing a MixIn to query each subclass individually. If you need that behavior across your app, consider implementing something like that.

If this is for a single view, you may be better off (quicker, and easier to understand) just writing your view to query each subclass and create a list of all the results.