Aggregation of an annotation in GROUP BY in Django

Question

UPDATE

Thanks to the posted answer, I found a much simpler way to formulate the problem. The original question can be seen in the revision history.

Answer 1

This solution by @alexandr addresses it properly.

https://stackoverflow.com/a/44915227/6323666

What you require is this:

from django.db.models import Sum

Title.objects.values('publisher').annotate(tot_dbl_prices=2*Sum('price'))

Ideally I reversed the scenario here by summing them up first and then doubling it up. You were trying to double it up then sum up. Hope this is fine.