[英]How to count objects count that have ForeignKey relationship?
I have two tables, lets say: Blogs and Posts. 我有两个表,可以说:博客和帖子。 Posts have ForeignKey field which connects Blogs and Posts tables.
帖子具有ForeignKey字段,用于连接Blog和Posts表。
How can I count how many Blogs have at least 1 Post? 如何计算至少有1个帖子的博客数量?
排除没有帖子的博客,然后计数。
Blog.objects.exclude(post=None).count()
您可以按相关模型进行过滤
Blog.objects.filter(post__isnull=False).count()
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