Python 无法使用|集| Django查询外键相关对象？

无法访问foreignkey相关对象，显示错误

我已经创建了Hospital和Availability的实例，但是在使用H1.Availability\u set.all（）进行查询时

型号.py

class Hospital(models.Model):
    name = models.CharField(max_length = 256)
    address = models.CharField(max_length=256,null=True, blank=True)
    phone = models.CharField(max_length=10)
    city = models.ForeignKey(City, on_delete=models.CASCADE, related_name = 'City')

    def __str__(self):
        return self.name

class Availablity(models.Model):
    hospital = models.ForeignKey(Hospital, on_delete = models.CASCADE, related_name='availablities')
    facility = models.ForeignKey(Facility, on_delete= models.CASCADE, related_name='facilities')
    updated_at = models.DateTimeField(auto_now=True)
    total = models.IntegerField(default=0)
    available = models.IntegerField(default=0)

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代码

对于您的

医院

可用性（秒）字段，您使用了，这是关系的名称，反过来，您可以访问

医院的
可用性
：

my_hospital.availablities.all()
谢谢你们解决了这个问题
my_hospital.availablities.all()
class Hospital(models.Model):
    # …
    city = models.ForeignKey(
        City,
        on_delete=models.CASCADE,
        related_name='city_hospitals'
    )