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

Going back to django's documentation, you can:

new_query_set = query_set_1 | query_set_2

This works as a logical OR which is actually addition without duplicates. This answers the addition aspect and AFAIK does not hit the db at all!

new_query_set = query_set_1 & query_set_2

This works as a logical AND.

Still missing how to subtract QuerySets. It's hard for me to believe this has not been dealt with elegantly by the community...