Re: How made worked models.Sum() together with models.Count in Django annotations?

My new method for resolve problem not working to:

(setattr(i, 'scope', i.get_scope()) for i in qs)

Django not found field 'scope'. (error from traceback)

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Cannot resolve keyword 'scope' into field. Choices are: answers, author, author_id, count_answers, count_opinions, count_tags, date_added, date_modified, id, is_dublicated, opinions, slug, status, tags, text_question, title, views

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понедельник, 16 мая 2016 г., 2:45:42 UTC+3 пользователь Simon Charette написал:

Hi Seti,

As documented this will yield the wrong results in most cases until subqueries
are used instead of JOINs[1].

Cheers,
Simon

[1] https://docs.djangoproject.com/en/1.9/topics/db/aggregation/#combining-multiple-aggregations

Le dimanche 15 mai 2016 12:42:44 UTC-4, Seti Volkylany a écrit :

For working models.Count() I am using distinct=True. It is right worked if not models.Sum().

next code right worked.

 def get_queryset(self, request):          qs = super(AnswerAdmin, self).get_queryset(request)          qs = qs.annotate(              count_likes=models.Count('likes', distinct=True),              count_comments=models.Count('comments', distinct=True),          )          return qs

I am added new annotation with models.Sum() and found not correct results

    qs = qs.annotate(          count_likes=models.Count('likes', distinct=True),          count_comments=models.Count('comments', distinct=True),          scope=models.Sum(              models.Case(                  models.When(likes__liked_it=True, then=1),                  models.When(likes__liked_it=False, then=-1),                  output_field=models.IntegerField()              ),          ),      )

Even if I added attribute distinct=True to models.Sum(), it still worked not correct.

How made worked models.Sum() and models.Count() together?

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