Question

我有一个简单的“ Driver” Django模型，其中包含“ id”，“ phone”和“ address”字段。我添加了一个序列化程序和一个请求处理程序，以从数据库中返回最后一个驱动程序，如下所示。当我传递单个实例驱动程序对象时，序列化程序将返回空数据。但是，如果我通过与列表相同的对象并设置many = True，则它将最后一个驱动程序作为列表返回。任何想法如何使序列化程序与实例参数一起工作，而不是将其包装在列表中？

        def get_last_driver(request):
            last_driver_object = Driver.objects.last()
            # This returns empty data {"last_driver": null}
            last_driver_data = DriverSerializer(last_driver_object).data
            # This results a list containing one object : {"last_driver": [{"id": 3, "phone": "0123456", "address": "DemoSteet 12"}]}
            last_driver_data = DriverSerializer([last_driver_object], many=True).data
            return JsonResponse({"last_driver": last_driver_data})

class DriverSerializer(serializers.ModelSerializer):
     class Meta:
         model = Driver
         fields = ("id", "phone", "address")

class Driver(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE, related_name='driver')
    avatar = models.CharField(max_length=500)
    phone = models.CharField(max_length=500, blank=True)
    address = models.CharField(max_length=500, blank=True)

    def __str__(self):
        return self.user.get_full_name()

Answer 1

我认为您的数据库不包含任何数据。因此，在使用API时添加一些响应，例如

from rest_framework.response import Response


def get_last_driver(request):
    if not SampleModel.objects.exists():  # if atleast one object is there
        return Response(data={"message": "There is no 'Driver' object in DB"})

    last_driver_object = Driver.objects.last()
    serializer = DriverSerializer(last_driver_object)
    return Response(data=serializer.data)

，在您的序列化程序中，不需要 return 语句，因为return中使用了functions。因此，您的序列化器将是

class DriverSerializer(serializers.ModelSerializer):
    class Meta:
        model = Driver
        fields = ("id", "phone", "address")

在Django

1 个答案: