在 django 中跨通用关系排序

Question

举个例子：

from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes import generic

class Container(models.Model):
    pass

class StoredUnit(models.Model):
    container = models.ForeignKey( Container )
    content_type = models.ForeignKey( ContentType )
    object_id = models.IntegerField()
    content_object = generic.GenericForeignKey()

class UnitA(models.Model):
    name = models.CharField()
    stored_unit = generic.GenericRelation( StoredUnit )

class UnitB(models.Model):
    name = models.CharField()
    stored_unit = generic.GenericRelation( StoredUnit )

给定一个容器，是否可以通过通用关系中的字段对“Unit”进行排序？

e.g.
container.storedunit_set.order_by('<genericly_related_unit>__name')