如何在django rest框架的基础上添加额外的字段

Question

我正在开发一个API，使用django-rest-framework-mongoengine和MongoDb，我想在用户输入的基础上向serializer的请求追加额外的字段，例如，如果用户输入keyword = @rohit49khatri，我想通过操纵keyword向请求追加两个字段，如type = username, username = rohit49khatri

下面是我的代码:

序列化器

class SocialFeedCreateSerializer(DocumentSerializer):
    type = 'username'
    class Meta:
        model = SocialFeedSearchTerm
        fields = [
            'keyword',
            'type',
        ]
        read_only_fields = [
            'type'
        ]

<<p> 视图/strong>

class SocialFeedCreateAPIView(CreateAPIView):
    queryset = SocialFeed.objects.all()
    serializer_class = SocialFeedCreateSerializer
    def perform_create(self, serializer):
        print(self.request.POST.get('type'))

但是当我打印type参数时，它给出了None

请帮我节省一些时间。谢谢。

Answer 1

的附加问题:如何获得type参数?

# access it via `django rest framework request`
self.request.data.get('type', None)
# or via `django request`
self.request.request.POST.get('type', None)

为原问题:

情况1)恕我直言，perform_create可以处理它:

 def perform_create(self, serializer):
     foo = self.request.data.get('foo', None)
     bar = extract_bar_from_foo(foo)
     serializer.save(
         additional_foo='abc',
         additional_bar=bar,
     )

情形2)如果您需要在数据进入序列化器之前对进行操作(以便被操作的数据将通过序列化器验证):

class SocialFeedCreateAPIView(CreateAPIView):
    queryset = SocialFeed.objects.all()
    serializer_class = SocialFeedCreateSerializer
    def create(self, request, *args, **kwargs):
        # you can check the original snipeet in rest_framework/mixin
        # original:  serializer = self.get_serializer(data=request.data)
        request_data = self.get_create_data() if hasattr(self, 'get_create_data') else request.data
        serializer = self.get_serializer(data=request_data)
        serializer.is_valid(raise_exception=True)
        self.perform_create(serializer)
        headers = self.get_success_headers(serializer.data)
        return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)
    def get_create_data(self):
        data = self.request.data.copy()
        # manipulte your data
        data['foo'] = 'foo'
        return data

如果你确实需要操作请求:(这里只是一个示例，您可以尝试找到另一个操作请求的地方。)

class SocialFeedCreateAPIView(CreateAPIView):
    queryset = SocialFeed.objects.all()
    serializer_class = SocialFeedCreateSerializer
    def initial(self, request, *args, **kwargs):
        # or any other condition you want
        if self.request.method.lower() == 'post':
            data = self.request.data
            # manipulate it 
            data['foo'] = 'foo'
            request._request.POST = data
        return super(SocialFeedCreateAPIView, self).initial(request, *args, **kwargs)