Django Count() in multiple annotations

Question

Say I have a simple forum model:

class User(models.Model):
    username = models.CharField(max_length=25)
    ...

class Topic(models.Model):
    user = models.F         


        

Answer 1

Try adding distinct to your last queryset:

User.objects.filter(
    username_startswith="ab").annotate(
    posts=Count('post')).annotate(
    topics=Count('topic')).values_list(
    "username","posts", "topics").distinct()

See https://docs.djangoproject.com/en/1.3/ref/models/querysets/#distinct for more details, but basically you're getting duplicate rows because the annotations span multiple tables.