PYTHON

django rest framework viewset perform_update

def perform_update(self, serializer):
    # Save with the new value for the target model fields
    user = self.request.user
    userid = str(user.id)
    serializer.save(stu_enrolled_classes=userid)
# The above def is in viewset and you can specify what field else can be edited in the API "PUT",
# Here We just set the stu_enrolled_classes field with is relation to the user to be the current user that send the "PUT" request.

django rest framework function based views

from rest_framework.decorators import api_view, permission_classes, renderer_classes
from rest_framework.permissions import IsAuthenticated
from rest_framework.renderers import JSONRenderer
from rest_framework.response import Response

@api_view(['GET'])
@permission_classes([IsAuthenticated])  # policy decorator
@renderer_classes([JSONRenderer])       # policy decorator
def items_not_done(request):
    user_count = Item.objects.filter(done=False).count()
    content = {'not_done': user_count}

    return Response(content)

rest framework viewset

from rest_framework.decorators import action
from rest_framework.response import Response
from rest_framework import permissions

class SnippetViewSet(viewsets.ModelViewSet):
    """
    This viewset automatically provides `list`, `create`, `retrieve`,
    `update` and `destroy` actions.

    Additionally we also provide an extra `highlight` action.
    """
    queryset = Snippet.objects.all()
    serializer_class = SnippetSerializer
    permission_classes = [permissions.IsAuthenticatedOrReadOnly,
                          IsOwnerOrReadOnly]

    @action(detail=True, renderer_classes=[renderers.StaticHTMLRenderer])
    def highlight(self, request, *args, **kwargs):
        snippet = self.get_object()
        return Response(snippet.highlighted)

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

django rest framework viewset

class UserViewSet(viewsets.ModelViewSet):
    """
    A viewset for viewing and editing user instances.
    """
    serializer_class = UserSerializer
    queryset = User.objects.all()