How to add additional fields on the base of inputs in django rest framework mongoengine

Question

I am developing an API, using django-rest-framework-mongoengine with MongoDb, I want to append additional fields to the request from the serializer on the base of user inputs, for example If user enters keyword=@rohit49khatri, I want to append two more fields to the request by manipulating keyword, like type=username, username=rohit49khatri

Here's my code:

Serializer

class SocialFeedCreateSerializer(DocumentSerializer):
    type = 'username'

    class Meta:
        model = SocialFeedSearchTerm
        fields = [
            'keyword',
            'type',
        ]
        read_only_fields = [
            'type'
        ]

View

class SocialFeedCreateAPIView(CreateAPIView):
    queryset = SocialFeed.objects.all()
    serializer_class = SocialFeedCreateSerializer

    def perform_create(self, serializer):
        print(self.request.POST.get('type'))

But when I print type parameter, It gives None

Please help me save some time. Thanks.

soooooot · Accepted Answer · 2016-09-29 08:05:59Z

2

for the additional question: how to get type parameter?

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

for the original question:

situation 1) IMHO for you situation, perform_create can handle it:

 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,
     )

situation 2) If you need to manipulate it before the data goes to serializer (so that the manipulated data will pass through serializer validation):

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

situation 3) If you do need to manipulate the request: (here's just an example, you can try to find out another place to manipulate the request.)

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)

edited Sep 29, 2016 at 8:05

answered Sep 29, 2016 at 7:19

soooooot

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2 Comments

Rohit Khatri Over a year ago

Is it possible to do it in the serializer after validation?

soooooot Over a year ago

@RohitKhatri situation 1(IMHO for you situation, perform_create can handle it) is the one after validation....I will update the answer to add the situation order....

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