old_contents: from django.shortcuts import render
  from django.views import generic
  from blog.models import Blog
  
  class IndexView(generic.ListView):
      template_name = 'blog/index.html'
      context_object_name = 'blog_list'
  
      def get_queryset(self):
          return Blog.objects.order_by('date').reverse()
new_contents: from django.views import generic
  from blog.models import Blog
  
  class IndexView(generic.ListView):
      template_name = 'blog/index.html'
      context_object_name = 'blog_list'
  
      def get_queryset(self):
          return Blog.objects.order_by('date').reverse()
subject: Remove unused