Django : Serializer validation prevents my code from updating an existing object

I have a Django project that get some user data and store them in a database.
I want my function to handle both Create and Update with the same method, so I created a view that inherit from UpdateAPIView

class UserList(generics.UpdateAPIView):
    queryset = RawUser.objects.all()
    serializer_class = RawUserSerializer
    
    def put(self, request, *args, **kwargs):
        raw_user_serializer: RawUserSerializer = self.get_serializer(data=request.data)
        raw_user_serializer.is_valid(raise_exception=True)  # Fail when user already exists
        raw_user: RawUser = RawUser(**raw_user_serializer.validated_data)

        // Some custom computing

        # Create or update raw_user
        self.perform_update(raw_user_serializer)

        return JsonResponse({'user_id':raw_user.id}, status = 201) 

class UserDetail(generics.RetrieveAPIView):
    queryset = RawUser.objects.all()
    serializer_class = RawUserSerializer

I think that the use of a UpdateAPIView and the function perform_update() is good. It works well when the user doesn’t exist already, but when I try to create a new user with the same primary key, I get : Bad Request: /api/profiling/users/, with the following response :

{
    "id": [
        "raw user with this id already exists."
    ]
}

It look like it fails on raw_user_serializer.is_valid(raise_exception=True) instruction. How can I solve my issue ? (while keeping the validation of my object)

>Solution :

The serializer thinks you want to create a new object. You should pass the instance you want to (completely) update:

class UserList(generics.UpdateAPIView):
    queryset = RawUser.objects.all()
    serializer_class = RawUserSerializer

    def put(self, request, *args, **kwargs):
        instance = self.get_object()
        raw_user_serializer: RawUserSerializer = self.get_serializer(
            instance, data=request.data, partial=False
        )
        raw_user_serializer.is_valid(
            raise_exception=True
        )  # Fail when user already exists
        raw_user = raw_user_serializer.update(self.instance, validated_data)

        # some computing…

        self.perform_update(raw_user_serializer)

        return JsonResponse({'user_id': raw_user.id}, status=201)