python - django Rest框架如何验证对象列表？

Question

我已经知道 drf 有一个向 obejct 添加验证器的接口(interface)，我有一个可以通过一个请求创建多个 Param 对象的 View ，我想验证是否有两个或多个对象的 name 和 value 字段相同，如何验证序列化器中的对象列表？

模型.py

class Param(models.Model):
    name = models.CharField(max_length=256)
    value = models.CharField(max_length=256)

    class Meta:
        unique_together = ('name', 'value')

序列化器.py

class ParamSerializer(serializers.ModelSerializer):

    class Meta:
        model = models.ParamKey
        fields = ['name', 'value']
        extra_kwargs = {
            'id': {
                'required': False,
            },
            'name': {
                'required': False,
            }
        }

View .py

class ParamViewSet(viewsets.ViewSet):

    def create(self, request):

        serializer = serializer.ParamKeySerializer(
            data=request.data, many=True)
        if serializer.is_valid():
            return Response()
        return Response()

Answer 1

您可以使用 ListSerializer 来实现此类功能。

ListSerializer 类提供同时序列化和验证多个对象的行为。您通常不需要直接使用 ListSerializer，而应该在实例化序列化器时简单地传递 many=True。

引用请访问https://www.django-rest-framework.org/api-guide/serializers/#listserializer

class ParamListSerializer(serializers.ListSerializer):
    def validate(self, attrs):
        # Here attrs contains list of Params You can validate it here
        pass

    def create(self, validated_data):
        books = [Book(**item) for item in validated_data]
        return Book.objects.bulk_create(books)

class ParamSerializer(serializers.ModelSerializer):

    class Meta:
        model = models.ParamKey
        fields = ['name', 'value']
        list_serializer_class = ParamListSerializer  # This specifies which list serializer class to user
        extra_kwargs = {
            'id': {
                'required': False,
            },
            'name': {
                'required': False,
            }
        }

    def validate(self, attrs):
        # enter your validations here
        pass