django annotate and count: how to filter the ones to include in count

Question

Given a queryset, I add the count of related objects (ModelA) with the following:

qs = User.objets.all()
qs.annotate(modela__count=models.Count(\'modela\'))
         


        

Answer 1

You can simply filter before you annotate:

from django.db.models import Q, Count

qs = ModelA.objects.filter(account__prop1__isnull=False).annotate(account_count=Count('account'))