CODEWITHSUNDEEP
pythondjangoserializationdjango-rest-framework
Chiefir
Chiefir

Reputation: 2671

DRF: how to validate arguments passed to serializer.save()?

How can I validate an additional arguments passed like this:

class MyViewSet(MultiSerializerViewSet):
    # some stuff

    def perform_create(self, serializer):
        serializer.save(creator=self.request.user)

How can I validate a creator in the serializer?

Upvotes: 1

Views: 2413

Answers (2)

Ozgur Akcali
Ozgur Akcali

Reputation: 5482

You can not validate fields passed as arguments to serializer.save() method, they will only be available in create method of the serializer, and I suggest not to run validations there. What I do in these kind of situations is, I override the create method of the viewset, and add extra parameters to the data I pass to the serializer. 

class MyViewSet(MultiSerializerViewSet):
    def create(self, request, *args, **kwargs):
        request_data = request.data
        request_data['creator'] = self.user.id

        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)

With this setup, you also need to add creator as a serializer field. With this, the field will be alailable in validtion flow.

Upvotes: 2

rahul.m
rahul.m

Reputation: 5854

Django reset framework has is_valid() method validate serializer

for e.g.

serializer = YourSerializer(data={'sample1': 'foobar', 'sample2': 'baz'})
serializer.is_valid()
# False
serializer.errors
# {'sample1': ['Some error.'], 'sample2': ['Some error.']}

refer this

Upvotes: 0

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