Django在模型中“无法设置属性”

I have a model like this one:

我有一个像这样的模型:

class MyReport(models.Model):
    group_id    = models.PositiveIntegerField(blank=False, null=False)
    test        = models.ForeignKey(Test, on_delete=models.CASCADE)
    owner       = models.ForeignKey(User, editable=False, default=get_current_user, on_delete=models.CASCADE)

    user_objects = UserFilterManager()

    @property
    def location(self):
        return self.test.location
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