Annotating a Sum results in None rather than zero

Question

I\'m making a QA site that is similar to the page you\'re on right now. I\'m attempting to order answers by their score, but answers which have no votes are having their score

Answer 1

You can use the Coalesce function from django.db.models.functions like:

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