old_contents: from django.contrib import admin
  
  # Register your models here.
  
new_contents: from django.contrib import admin
  from . import models as blog 
  
  class ArticleAdmin(admin.ModelAdmin):
      ordering = ('-date',)
      list_filter = ('id', 'date',)
      list_display = ('id', 'title', 'date', 'category',)
      search_fields = ('id', 'title', 'date', 'category',)
      date_hierarchy = 'date'
      filter_horizontal = ('tags',) # for ease of use
  
  admin.site.register(blog.Article, ArticleAdmin)
  admin.site.register(blog.Category)
  admin.site.register(blog.Tag)
  
subject: add models admin page