use 0 if value is none in django annotate code example

Example 1: django sum get 0 if none

from django.db.models.functions import Coalesce

answers = Answer.objects.filter(<something here>)
                        .annotate(score=Coalesce(Sum('vote__type'), 0))
                        .order_by('-score')

Example 2: django sum get 0 if none

answers = Answer.objects.filter(<something here>)
                        .annotate(score=Coalesce(Sum('vote__type'), 0))
                        .order_by('-score')