如何检查模型是否有引用

假设我在django中有一个地址(思考街道地址)模型,它被jobs(思考工作站点)和客户(思考邮件地址)引用。

执行查询时,是否可以仅筛选没有对其引用的行?

模型

class Address(models.Model):

    street = models.TextField()
    suite = models.TextField()
    city = models.TextField()
    state = models.TextField()
    county = models.TextField(default="")
    country = models.TextField(default= "USA")
    zip = models.TextField()
    notes = models.TextField()

class Customer(models.Model ):

    firstname = models.TextField(null=False)
    lastname = models.TextField(blank=True)
    address = models.ForeignKey(Address,null=True,blank=True,default=None)

class Job(models.Model):

    number=models.IntegerField(null=False)
    name=models.CharField(max_length=100,default="")
    address = models.ForeignKey(Address,null=True)

所需功能

#get all addresses that don't have a job or customer referencing it
addresses = Address.objects.filter(job_set_count = 0, customer_set_count=0)

聚苯乙烯

这会是使用“一对一”关系的场景吗?