相关疑难解决方法(0)

我有一个Django类如下:

class MyModel(models.Model):
    my_int = models.IntegerField(null=True, blank=True,)
    created_ts = models.DateTimeField(default=datetime.utcnow, editable=False)

当我运行以下查询集时,我收到一个错误:

>>> from django.db.models import Max, F, Func
>>> MyModel.objects.all().aggregate(Max(Func(F('created_ts'), function='UNIX_TIMESTAMP')))
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "MyVirtualEnv/lib/python2.7/site-packages/django/db/models/query.py", line 297, in aggregate
    raise TypeError("Complex aggregates require an alias")
TypeError: Complex aggregates require an alias

如何调整我的查询集以便我不会收到此错误？我想找到带有最新created_ts的MyModel实例.我想使用该UNIX_TIMESTAMP功能来获取它.