Question

鉴于此模型：

from django.db import models


class Post(models.Model):
    text = models.CharField(max_length=255)


class Comment(models.Model):
    text = models.CharField(max_length=255)
    needs_attention = models.BooleanField(default=False)
    created_at = models.DateTimeField(auto_now_add=True)
    post = models.ForeignKey(Post)

我可以annotate帖子列表：

Post.objects.annotate(last_comment_date=Max('comment__created_at'))

了解last_comment_date，如何注释以设置last_comment_needs_attention的值？

Answer 1

试试这个：

needs_attention = Q(comment__needs_attention=True)
Post.objects.annotate(last_comment_date=Max('comment__created_at'), filter=needs_attention)

Django高级注释

1 个答案: