我有一个方法has_related_object在我的模型中需要检查相关对象是否存在
class Business(base):
name = models.CharField(max_length=100, blank=True, null=True)
def has_related_object(self):
return (self.customers is not None) and (self.car is not None)
class Customer(base):
name = models.CharField(max_length=100, blank=True, null=True)
person = models.OneToOneField('Business', related_name="customer")
但我收到错误：
Business.has_lated_object()
相关对象不存在：企业没有客户。
Use hasattr(self, 'customers')以避免异常检查Django 文档中推荐 https://docs.djangoproject.com/en/stable/topics/db/examples/one_to_one/:
def has_related_object(self):
return hasattr(self, 'customers') and self.car is not None
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