class AO_AppGroup(models.Model):
name = models.CharField(max_length=40,db_index=True) #組名稱
iconurl = models.CharField(max_length=40) #圖標(biāo)資源
client = models.ForeignKey('AppClient',db_index=True) #組隸屬于某一個具體的用戶
aos = models.ManyToManyField('ActiveObject') #組內(nèi)包含的ActiveObject
aos = AO_AppGroup.objects.get(client__id=1).aos.filter(id=1).count()