如何查询Django ORM中的双层流数据?

I have two models:

我有两个模型:

class AddressRegion(models.Model):
    name = models.CharField(max_length=8)


class AvailableArea(models.Model):
    name = models.CharField(max_length=8)
    addressregion = models.ForeignKey(AddressRegion, default=1) 
class AddressReg