old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  from django.contrib import admin
  
  from .models import TOpen
  
  
  class TOpenAdmin(admin.ModelAdmin):
      list_display = ('author', 'title', 'created_at',
                      'last_opened_at', 'is_invalid')
      search_fields = ('author.username', 'title', 'description', 'note')
      list_filter = ('created_at', 'last_opened_at', 'is_invalid')
  
  admin.site.register(TOpen, TOpenAdmin)
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  from django.contrib import admin
  
  from .models import TOpen
  
  
  class TOpenAdmin(admin.ModelAdmin):
      list_display = ('author', 'title', 'created_at',
                      'last_opened_at', 'is_invalid')
      search_fields = ('title', 'description', 'note')
      list_filter = ('created_at', 'last_opened_at', 'is_invalid')
  
  admin.site.register(TOpen, TOpenAdmin)
  
subject: Adjust admin.