simple way for QuerySet union and subtraction in django?

Question

Consider two QuerySet objects of the same class. Is there a simple way to unify them into a single QuerySet by calculating the union? Also, is there a simple way to subtract the

Answer 1

You can use the Q object.

The syntax could be something like this:

added_query_set = YourModel.objects.\
         filter(Q(id__in=old_query_set_1)|Q(id__in=old_query_set_2))

You probably can optimize based on your actual needs and get the amount of db hits down (right now it's 3), but this should get you started.