DjangoのORMでgroup byは"annotate"を使ってるみたいですが、うまくいかなかったので、"QuerySet"使いました。
from django.db.models.query import QuerySet
query = cls.objects.filter(id=id, status=1).query
query.group_by = ['user_id']
result = QuerySet(query=query, model=cls)
以上です。
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