显示有关多对多的对象我有新闻和类别一个简单的模型:如何计算并在Django
class Category(models.Model):
name = models.CharField()
slug = models.SlugField()
class News(models.Model):
category = models.ManyToManyField(Category)
title = models.CharField()
slug = models.SlugField()
text = models.TextField()
date = models.DateTimeField()
我想算新闻为每个类别和网站上显示,像这样:
Sport (5)
School (4)
Films (6)
Computer (2)
etc...
我该怎么做?
谢谢!
我想这一点,但我得到AttributeError的: '管理器' 对象没有属性'注释' – Matthew 2009-11-20 22:09:20
好吧,它的工作原理,但我想在类别中计数新闻,而不是新闻中的类别... – Matthew 2009-11-20 22:37:32
Category.objects.all()。annotate(num_news = Count('news_set')) – 2009-11-21 00:16:06