Add new field and value to the request - Django - Django Rest Framework (viewset, serializer)

Question

i have a endpoint in django-rest-framework and receive a object name and date.

I need include user (fk_model_user) in object before save my database, how save or update including new item in body request?

Viewset:

    class MusicStylesViewSet(
        mixins.ListModelMixin,
        mixins.CreateModelMixin,
        mixins.UpdateModelMixin,
        mixins.DestroyModelMixin,
        mixins.RetrieveModelMixin,
        viewsets.GenericViewSet
    ):
        permission_classes = [permissions.AllowAny]
        queryset = MusicStyleModel.objects.all()
        serializer_class = StyleSerializer

Serializer:

    class StyleSerializer(ModelSerializer):
        class Meta:
            model = MusicStyleModel
            fields = ('id', 'name', 'date', 'user')

Model:

    class MusicStyleModel(models.Model):
        id = models.UUIDField(primary_key=True, unique=True, default=uuid.uuid4, editable=False, null=False)
        name = models.CharField(max_length=150, null=False, blank=False)
        date = models.DateTimeField(null=False, blank=False)
        user = models.ForeignKey(
            CustomUser,
            null=True,
            blank=False,
            on_delete=models.CASCADE
        )

Example - Post Request:

    {
        "name": "test",
        "date": "2021-05-14T15:47:06.794639-03:00"
    }

Example - Post Response:

    {
        "id": "810ae929-2f6d-411a-8d10-77c8f613a8ac",
        "name": "test",
        "date": "2021-05-14T15:47:06.794639-03:00",
        "user": "c6fbbfee-2f16-49f3-b4cd-b99e05a66ea8"
    }

"id": "810ae929-2f6d-411a-8d10-77c8f613a8ac", automatically generated in the model

"user": "c6fbbfee-2f16-49f3-b4cd-b99e05a66ea8" user id request intercepted, and save

maybe this, https://stackoverflow.com/questions/35518273/how-to-set-current-user-to-user-field-in-django-rest-framework — JPG, May 18 '21 at 16:25
you can overwrite create method in your serialzier or post method in your viewset (APIView). based upon what exactly you want user to be. — ItsMilann, May 18 '21 at 16:35
i dont see much difference, except serializers dont have access to request object directly so I would suggest to create it in apiview — ItsMilann, May 18 '21 at 16:44
@ItsMilann To create ApiView, do I need to modify my current apiview? Can you demonstrate how I would do this in the 'apiview' and 'serializer'? — maistack123, May 18 '21 at 16:47
so do you want user field to be null or any other specific user? — ItsMilann, May 18 '21 at 16:54
@ItsMilann In the request the field is null, but "viewset" or "serializer" set user_id value in user field when to save or update. — maistack123, May 18 '21 at 17:16

ItsMilann · Answer 1 · 2021-05-19T16:36:01.300

1

if you're going to use all these mixins better use ModelViewSet'

from rest_framework import viewsets

class MusicStylesViewSet(
    mixins.ListModelMixin,
    mixins.CreateModelMixin,
    mixins.UpdateModelMixin,
    mixins.DestroyModelMixin,
    mixins.RetrieveModelMixin,
    viewsets.GenericViewSet
):
    permission_classes = [permissions.AllowAny]
    queryset = MusicStyleModel.objects.all()
    serializer_class = StyleSerializer
    def post(self, request, *args, **kwargs):
        serializer = StyleSerializer(request.data)
        if serializer.is_valid():
            serializer.validated_data['user'] = request.user
            serializer.save()
        return self.create(request, *args, **kwargs)

edited May 19 '21 at 16:36

answered May 18 '21 at 17:44

ItsMilann

395
3
12

make sure the user is logged in. Can you check the value of request.user, what does it show? – ItsMilann May 19 '21 at 11:40
i placed request.user print, but not print. – maistack123 May 19 '21 at 11:47
I have updated the statement, please try that. – ItsMilann May 19 '21 at 16:36

score 1 · Accepted Answer · answered May 20 '21 at 01:33

I managed to solve using create:

from rest_framework import viewsets, status
from rest_framework.response import Response

class MusicStylesViewSet(
    mixins.ListModelMixin,
    mixins.CreateModelMixin,
    mixins.UpdateModelMixin,
    mixins.DestroyModelMixin,
    mixins.RetrieveModelMixin,
    viewsets.GenericViewSet
):
    permission_classes = [permissions.AllowAny]
    queryset = MusicStyleModel.objects.all()
    serializer_class = StyleSerializer

    def create(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)

        data = serializer.validated_data
        data['user'] = request.user

        self.perform_create(serializer)
        headers = self.get_success_headers(serializer.data)
        return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)

Add new field and value to the request - Django - Django Rest Framework (viewset, serializer)

2 Answers2