django - Django-如何获取按属性值分组的queryset列表

Question

class MyObject(models.Model):
    type = models.CharField()

    def __unicode__(self):
        return self.type


#the type could be anything, its not predictable
MyObject.objects.create(type='a')
MyObject.objects.create(type='b')
MyObject.objects.create(type='c')
MyObject.objects.create(type='a')

是否可以检索按如下类型分组的queryset列表:

[[<MyObject: a>, <MyObject: a>], [<MyObject: b>], [<MyObject: c>]]

Answer 1

这是一种可能的方法:

grouped = dict()
for obj in MyObject.objects.all():
    grouped.setdefault(obj.type, []).append(obj)

这将产生一个像这样的字典:

{'a': [<obj>, <obj>], 'b':[<obj>]}