Django Count() in multiple annotations

I think Count('topics', distinct=True) should do the right thing. That will use COUNT(DISTINCT topic.id) instead of COUNT(topic.id) to avoid duplicates.

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

Django Count() in multiple annotations

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