按Django中的注释数过滤对象

时间:2011-05-02 09:22:44

标签: django django-comments

如何按评论数量过滤查询集,并按评论数量下降排序?

我试图做Post.objects.filter(comment_count > 0).order_by('-comment_count')这样的事情,但这不起作用或当然。

谢谢!

我的帖子模型:

class Post(models.Model):
 nickname = models.CharField(max_length=200, default=u'anonymous')
 body = models.TextField()
 pub_date = models.DateTimeField('Date Published', auto_now_add=True)
 up_date = models.DateTimeField('Date Updated', auto_now=True)
 category = models.ForeignKey(Category, related_name='post_category')
 counter = models.IntegerField(default=0)
 status = models.IntegerField(choices=POST_STATUS, default=0)
 votes = models.IntegerField('Votes', default=0)

编辑:

刚添加以下代码

from django.contrib.contenttypes import generic
from django.contrib.comments.models import Comment

comments = generic.GenericRelation(Comment, object_id_field="object_pk")

在我看来:

post_list = Post.objects.annotate(comment_count=Count('comments')).filter(status=STATUS.ACCEPTED).filter(comment_count__gt=0).order_by('-comment_count')

我修复了我的模型并查看了代码。他们现在工作正常。

谢谢!

1 个答案:

答案 0 :(得分:2)

使用'注释';像这样的东西:

from django.db.models import Count
Post.objects.annotate(comment_count=Count('comments')).filter(comment_count__gt=0).order_by('-comment_count')

有关详细信息,请参阅以下内容: http://docs.djangoproject.com/en/dev/topics/db/aggregation/