python - 序列化程序返回不正确的输出

Question

我有一个模型:

class Route(models.Model):
    name = models.CharField("Номер маршрута", max_length=100)
    evotor_user = models.ForeignKey(settings.AUTH_USER_MODEL, verbose_name="пользователь эвотор", on_delete=models.CASCADE)
    nds_CHOICES = (
        (0, 'БЕЗ НДС'),
        (1, 'Основная ставка 0%'),
        (2, 'Основная ставка 10%'),
        (3, 'Расчётная ставка 10%'),
        (4, 'Основная ставка 18%'),
        (5, 'Расчётная ставка 18%')
    )
    nds = models.IntegerField('НДС', choices=nds_CHOICES, default=0)
    def __str__(self):
        return self.name

    class Meta:
        verbose_name = "Номер маршрута"
        verbose_name_plural = "Номера маршрутов"

我有那个模型的序列化器:

class RouteSerializer(serializers.ModelSerializer):
    class Meta:
        model = Route
        fields = ("id", "name", "nds")

我的 APIView

class CarView(APIView):
    authentication_classes = (BearerAuthentication,)
    permission_classes = (IsAuthenticated,)
    def get(self, request):
        if 'route_id' not in request.GET or request.GET['route_id']=="":
            #return Response({'message': 'Не указан ID маршрута'}, status=status.HTTP_400_BAD_REQUEST)
            car = Car.objects.filter(evotor_user=request.user)
        else:
            car = Car.objects.filter(route__id=request.GET['route_id'])
        serializer = CarSerializer(car, many=True)
        print(serializer.data)
        return Response(serializer.data)

使用这个序列化器

class CarSerializer(serializers.ModelSerializer):
    route = RouteSerializer
    class Meta:
        model = Car
        fields = ("id", "name", "route")

并且必须像这样返回我的输出:[ { “编号”:1， "名称": "dfgdfgdfg", “路线”: { '编号':1， '名称':'路线名称'， 'nds':0， } }]

但它返回:[ { “编号”:1， "名称": "dfgdfgdfg", “路线”:1 }]

Answer 1

CarSerializer.route 声明错误。它必须是 RouteSerializer 的实例，如下所示:

class CarSerializer(serializers.ModelSerializer):
    route = RouteSerializer(read_only=True)
    class Meta:
        model = Car
        fields = ("id", "name", "route")

这称为“嵌套关系”，请参阅 https://www.django-rest-framework.org/api-guide/relations/#nested-relationships 处的文档