Question

嗨，我有API，需要执行带有子查询的Join表并返回queryset。当我打印queryset时，它将打印其中包含一个对象的查询集，但返回404'detail'：'Not Found'错误。

我在URL中获得了客户ID，我必须查询Customer表以获取相应的address_id 并从地址表发送address_id的地址详细信息。

以下是模型

class Customer(models.Model):
    customer_id = models.AutoField(primary_key = True, auto_created = True)
    first_name = models.CharField(max_length = 45)
    last_name = models.CharField(max_length = 45)
    address_id = models.ForeignKey('Address', db_column = 'address_id', on_delete = models.CASCADE)

class Address(models.Model):
   address_id = models.AutoField(primary_key = True)
   district = models.CharField(max_length = 20 )
   postal_code = models.CharField(max_length = 10 , blank=True)
   phone = models.CharField(max_length = 20)

下面是视图

class AddressDetail(generics.RetrieveUpdateDestroyAPIView):

    lookup_url_kwarg = "customer_id"
    serializer_class = AddressSerializer
    
    def get_queryset(self):
        
        cust_id = self.kwargs['customer_id']
        
        customer_addr_id = Customer.objects.filter(customer_id = cust_id)
        return Address.objects.filter(address_id__in=customer_addr_id.values('address_id'))

下面是网址

path('<int:customer_id>/address',views.AddressDetail.as_view())

我可以打印并查看查询集中的对象，但在客户端得到响应“未找到”。如果我遗漏了一些东西，请告诉我。

Answer 1

QuerySet.values()返回一个类似dict的对象，其所有键都设置为字符串“ address_id”，值设置为“ address_id”值，要检查地址是否存在，可以改用values_list。

# also you can chain `.distinct()` in the end
Address.objects.filter(address_id__in=customer_addr_id.values_list('address_id', flat=True))

Django Rest Framework：get_queryset返回“详细信息”：“未找到”

1 个答案: