CODEWITHSUNDEEP
djangoserializationfile-uploaddjango-rest-frameworkmultipartform-data
Marcus Grass
Marcus Grass

Reputation: 1083

Django rest framework serializer.errors outputs ["This field is required."] with a multipart/form-data post request

I've been looking at this for a while now, I'm sending out a post request with multipart/form-data, but get back the error ["This field is required."] for each field that I'm supposed to populate with the request.

Here's the Serializer:

class InvoiceUploadSerializer(serializers.Serializer):
    serial=serializers.CharField(max_length=256, required=True)
    amount=serializers.CharField(max_length=256, required=True)
    debtor=serializers.CharField(max_length=256, required=True)
    dateout=serializers.CharField(max_length=256, required=True)
    expiration=serializers.CharField(max_length=256, required=True)
    invoicefile=serializers.FileField()

    class Meta:
        fields=('serial', 'amount', 'debtor', 'dateout', 'expiration', 'invoicefile',)

And the View:

class InvoiceViewSet(viewsets.ModelViewSet):
    queryset=Invoices.objects.all()
    serializer_class=InvoiceSerializer
    parser_classes=(MultiPartParser, FormParser)

    def get_permissions(self):
        if self.request.method in permissions.SAFE_METHODS:
            return (permissions.AllowAny(),)

        if self.request.method == 'POST':
            return (permissions.IsAuthenticated(),)

        return (permissions.IsAuthenticated(), IsAccountOwner(),)

    def create(self, request):
        serializer=InvoiceUploadSerializer(data=request.data)
        if serializer.is_valid():
            ... handle serializer

            return Response(serializer.validated_data, status=status.HTTP_201_CREATED)
        else:
            emessage=serializer.errors
            return Response({
                'status': 'Bad request',
                'message': emessage,
            }, status=status.HTTP_400_BAD_REQUEST

Here is a picture showing the browser console with the outgoing request: enter image description here

And lastly the error message from the browser console: enter image description here

I don't understand why it tells me all fields are missing, the header is set correctly and it looks fine to me.

Switched up the view-code and urls still the same error, New with the same problem:

class InvoiceUploadView(APIView):
    parser_classes=(MultiPartParser, FormParser)
    def get_permissions(self):
        return (permissions.AllowAny(),)

    def post(self, request):
        serializer=InvoiceUploadSerializer(data=request.POST)
        if serializer.is_valid():
            return Response(serializer.validated_data, status=status.HTTP_201_CREATED)
        else:
            emessage=serializer.errors
            return Response({
                'status': 'Bad request',
                'message': emessage,
            }, status=status.HTTP_400_BAD_REQUEST)

Upvotes: 1

Views: 5823

Answers (1)

Will Keeling
Will Keeling

Reputation: 23004

Your POST request is missing the multipart boundary in it's Content-Type header. Without that it is possible that the application won't be able to parse the request payload - and validation would fail because data would be missing.

The browser would normally set the Content-Type header and boundary for you. Perhaps you are overriding that and setting the Content-Type header yourself somewhere? If you are, unset it and try making another request.

Upvotes: 1

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