如何根据django中的相关对象属性对对象进行分组

I have these two models;

我有两个模型;

class Point(models.Model):
    point       = models.IntegerField()
    description = models.CharField("Action", max_length=128)

class PointLog(models.Model):
    user   = models.ForeignKey('users.User', verbose_name ="Related User")
    point  = models.ForeignKey(Point)
    date   = models.DateTimeField(default = datetime.datetime.now())
class Poin