I have a need to select base classes that does not have derived class
defined using the ORM. Using the Place/Restaurant example in the
Django doc, I find that:

1) Place.objects.filter(restaurant__isnull=True)

returns all places.

and
2) Place.objects.filter(restaurant__serves_hotdog__isnull=True)

works, returning all Places that is not a restaurant.

I wonder though, is this the *correct* way to do the query?

P.K.

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