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[英]How can I obtain all posts published in the last hour from a blog (built with django) with a queryset?
[英]How can I write a Django query to aggregate the most recently published entry for each author of a collective blog?
假定以下简化模型:
class Blog(models.Model):
name = models.CharField()
class Author(models.Model):
blog = models.ForeignKey('Blog', related_name='authors')
class Entry(models.Model):
author = models.ForeignKey('Author', related_name='entries')
published_on = models.DateTimeField(auto_now_add=True)
给定特定博客的主键,我将如何检索条目的查询集,以便该查询集仅包含每个作者的单个最新条目?
在这里找到答案:
authors = Author.objects.annotate(latest_entry_published_on=Max('entries__published_on'))
entries = Entry.objects.filter(published_on__in=[a.latest_entry_published_on for a in authors])
我会尝试类似的东西:
Entry.objects.order_by('-published_on').values_list('author_id').distinct()
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