从Django 1.1中检出annotate（）函数。
http://docs.djangoproject.com/en/dev/topics/db/aggregation/#topics-db- aggregation
示例（从上面的URL）：
>>> q = Book.objects.annotate(num_authors=Count('authors'))
>>> q[0].num_authors
2
>>> q[1].num_authors
1
如何在Django中计算和显示与ManyToMany相关的对象
如何在Django中计算和显示与ManyToMany相关的对象
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