How to specify lookup_field in django

Question

I'm going to use UpdateAPIView in django. When I completed the view and ran the server, the following error occurred.

Expected view updateViewSet to be called with a URL keyword argument named "pk". Fix your URL conf, or set the `.lookup_field` attribute on the view correctly.

I wonder why I shouldn't designate lookup_field as pk in my code and what I can use instead of pk. Here is my code

serializers.py

from rest_framework import serializers
from .models import arduino

class arduinoSerializers (serializers.ModelSerializer) :
    name = serializers.CharField(source='name.username', read_only=True)
    class Meta :
        model = arduino
        fields = ['name', 'temp', 'humi']

views.py

from .models import arduino
from .serializers import arduinoSerializers
from rest_framework.viewsets import ViewSet
from rest_framework.response import Response
from rest_framework.generics import CreateAPIView, UpdateAPIView

class arduinoViewSet (ViewSet) :
    serializer_class = arduinoSerializers
    
    def data (self, request) :
        queryset = arduino.objects.filter(name=self.request.user)
        serializer = arduinoSerializers(queryset, many=True)
        return Response(serializer.data)
        
class createViewSet (CreateAPIView) :
    serializer_class = arduinoSerializers

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

    def get_queryset (self) :
        user = self.request.user
        return arduino.objects.filter(name=user)

    def dataReceive (self, request) :
        queryset = self.get_queryset()
        serializer = arduinoSerializers(queryset, many=True)
        if serializer.is_valid() :
            perform_create(serializer)
        return Response(serializer.data)

class updateViewSet (UpdateAPIView) :
    serializer_class = arduinoSerializers
    lookup_field = 'pk'

    def perform_update (self, serializer) :
        serializer.update(name=self.request.user)

    def get_queryset (self) :
        user = self.request.user
        return arduino.objects.filter(name=user)

    def dataReceive (self, request) :
        queryset = self.get_queryset()
        serializer = arduinoSerializers(queryset, many=True)
        if serializer.is_valid() :
            perform_update(serializer)
            return Response(serializer.data)

urls.py

urlpatterns = [
    path('admin/', admin.site.urls),
    path('', include('api.urls')),
    path('auth/', include('rest_auth.urls')),
    path('auth/registration/', include('rest_auth.registration.urls')),
]

api\urls.py

urlpatterns = [
    path('data/', arduinoViewSet.as_view({'get' : 'data'})),
    path('create/', createViewSet.as_view()),
    path('update/', updateViewSet.as_view()),
]

thanks in advance

Answer 1

The update view doesn’t know which id(pk) to update. Try adding the pk in the update url

urlpatterns = [
    path('update/<int:pk>/', updateViewSet.as_view()),
]