old_contents: # Django
  from django.shortcuts import get_object_or_404
  from django.views.generic import *
  
  # Third party apps
  from django_filters.rest_framework import DjangoFilterBackend
  from rest_framework import generics
  from rest_framework.decorators import api_view
  from rest_framework import permissions
  from rest_framework.reverse import reverse
  from rest_framework.response import Response
  
  # Other AstroBin apps
  from common.mixins import AjaxableResponseMixin
  
  # This app
  from .forms import NestedCommentForm
  from .models import NestedComment
  from .permissions import IsOwnerOrReadOnly
  from .serializers import *
  
  
  class NestedCommentList(generics.ListCreateAPIView):
      """
      API endpoint that represents a list of nested comment.s
      """
      model = NestedComment
      queryset = NestedComment.objects.order_by('pk')
      serializer_class = NestedCommentSerializer
      filter_backends = (DjangoFilterBackend,)
      filter_fields = ('content_type', 'object_id',)
      permission_classes = (permissions.IsAuthenticatedOrReadOnly,
                            IsOwnerOrReadOnly,)
  
      def pre_save(self, obj):
          obj.author = self.request.user
  
  
  class NestedCommentDetail(generics.RetrieveUpdateDestroyAPIView):
      """
      API endpoint that represents a single nested comment.
      """
      model = NestedComment
      serializer_class = NestedCommentSerializer
      permission_classes = (permissions.IsAuthenticatedOrReadOnly,
                            IsOwnerOrReadOnly,)
  
      def pre_save(self, obj):
          obj.author = self.request.user
  
  
new_contents: # Django
  from django.shortcuts import get_object_or_404
  from django.views.generic import *
  
  # Third party apps
  from django_filters.rest_framework import DjangoFilterBackend
  from rest_framework import generics
  from rest_framework.decorators import api_view
  from rest_framework import permissions
  from rest_framework.reverse import reverse
  from rest_framework.response import Response
  
  # Other AstroBin apps
  from common.mixins import AjaxableResponseMixin
  
  # This app
  from .forms import NestedCommentForm
  from .models import NestedComment
  from .permissions import IsOwnerOrReadOnly
  from .serializers import *
  
  
  class NestedCommentList(generics.ListCreateAPIView):
      """
      API endpoint that represents a list of nested comment.s
      """
      model = NestedComment
      queryset = NestedComment.objects.order_by('pk')
      serializer_class = NestedCommentSerializer
      filter_backends = (DjangoFilterBackend,)
      filter_fields = ('content_type', 'object_id',)
      permission_classes = (permissions.IsAuthenticatedOrReadOnly,
                            IsOwnerOrReadOnly,)
  
      def pre_save(self, obj):
          obj.author = self.request.user
  
  
  class NestedCommentDetail(generics.RetrieveUpdateDestroyAPIView):
      """
      API endpoint that represents a single nested comment.
      """
      model = NestedComment
      queryset = NestedComment.objects.all()
      serializer_class = NestedCommentSerializer
      permission_classes = (permissions.IsAuthenticatedOrReadOnly,
                            IsOwnerOrReadOnly,)
  
      def pre_save(self, obj):
          obj.author = self.request.user
  
  
subject: Add queryset attribute to NestedCommentDetail view