原始异常文本为：'QuerySet' 对象没有属性 'client'

Question

尝试在序列化程序 ClientSerializer 上获取字段 client 的值时，我得到了 AttributeError。

序列化程序字段的命名可能不正确，并且与 QuerySet 实例上的任何属性或键都不匹配。

models.py

class Box(models.Model):
    box = models.IntegerField()
    controller = models.ForeignKey(Controller, related_name='boxes', on_delete=models.CASCADE)

    def __str__(self):
        return str(self.box)


class Client(models.Model):
    client = models.CharField(max_length=30)
    cpf = models.IntegerField()
    box = models.OneToOneField(
    
        Box,
        on_delete=models.CASCADE,
        primary_key=True
    )

    def __str__(self):
        return self.client

serializers.py

class ClientSerializer(serializers.ModelSerializer):
    class Meta:
        model = Client
        fields = [
            "id",
            "client",
            "cpf",
            "box",
        ]

class BoxSerializer(serializers.ModelSerializer):
    class Meta:
        model = Box
        fields = [
            "id",
            "box",
            "controller"
        ]

views.py


class ClientViewSet(viewsets.ModelViewSet):
    serializer_class = ClientSerializer
    queryset = Client.objects.all()

    def list(self, request, store_pk=None, locker_pk=None, controller_pk=None, box_pk=None):
        queryset = Client.objects.filter(box=box_pk, box__controller=controller_pk, box__controller__locker=locker_pk, box__controller__locker__store=store_pk)
        serializer = ClientSerializer(queryset, context={'request': request})
        return Response(serializer.data)

    def retrieve(self, request, store_pk=None, locker_pk=None, controller_pk=None, box_pk=None):
        queryset = Client.objects.filter(box=box_pk, box__controller=controller_pk, box__controller__locker=locker_pk, box__controller__locker__store=store_pk)
        client = get_object_or_404(queryset)
        serializer = ClientSerializer(client, context={'request': request})
        return Response(serializer.data)

我正在尝试在 lockers/1/controllers/1/boxes/1/client/ 上获取对象客户端这是 OneToOneField 与框的关系，它在嵌套路由器中我已经尝试过使用装饰器 @action 但还是没用。

有人知道为什么找不到正确的对象属性吗？

Answer 1

对于 list 方法，您应该在创建新的序列化程序实例时使用 many=True 参数：

serializer = ClientSerializer(queryset, context={'request': request}, many=True)

在 retrieve 的情况下，只应接收一个对象。而不是

client = get_object_or_404(queryset)

你应该在查询集上调用 first()、last()（或者最基本和清楚的 - .get(pk=pk)）来检索只有一个项目来自查询集。那么你应该只执行：

# client is one of elements of your queryset
serializer = ClientSerializer(client, context={'request': request})

原始异常文本为：'QuerySet' 对象没有属性 'client'

Original exception text was: 'QuerySet' object has no attribute 'client'

python

django

django-queryset

django-rest-framework

django-rest-viewsets

models.py

serializers.py

views.py