仅过滤 Django 中的注释 [英] Filtering only on Annotations in Django

问题描述

举个例子:http://docs.djangoproject.com/en/dev/topics/db/aggregation/#filter-and-exclude

Publisher.objects.filter(book__rating__gt=3.0).annotate(num_books=Count('book'))

无论如何要让过滤器仅适用于注释，因此它会返回所有出版商，其中一些出版商的 num_books=0?

Is there anyway to have the filter only apply to the annotation, so it would return all publishers, with some having a num_books=0?

推荐答案

可以在过滤器中使用注解变量.

You can use the annotation variable in the filter.

publishers=Publisher.objects.annotate(num_books=Count('book')).filter(num_books__gte=2)

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