old_contents: from django.conf.urls import url
  
  from ..models import Tag
  from ..utils import DetailView
  from ..views import (
      TagCreate, TagDelete, TagList, TagPageList,
      TagUpdate)
  
  urlpatterns = [
      url(r'^$',
          TagList.as_view(),
          name='organizer_tag_list'),
      url(r'^create/$',
          TagCreate.as_view(),
          name='organizer_tag_create'),
      url(r'^(?P<page_number>\d+)/$',
          TagPageList.as_view(),
          name='organizer_tag_page'),
      url(r'^(?P<slug>[\w\-]+)/$',
          DetailView.as_view(
              context_object_name='tag',
              model=Tag,
              template_name=(
                  'organizer/tag_detail.html')),
          name='organizer_tag_detail'),
      url(r'^(?P<slug>[\w-]+)/delete/$',
          TagDelete.as_view(),
          name='organizer_tag_delete'),
      url(r'^(?P<slug>[\w\-]+)/update/$',
          TagUpdate.as_view(),
          name='organizer_tag_update'),
  ]
  
new_contents: from django.conf.urls import url
  
  from ..views import (
      TagCreate, TagDelete, TagDetail, TagList,
      TagPageList, TagUpdate)
  
  urlpatterns = [
      url(r'^$',
          TagList.as_view(),
          name='organizer_tag_list'),
      url(r'^create/$',
          TagCreate.as_view(),
          name='organizer_tag_create'),
      url(r'^(?P<page_number>\d+)/$',
          TagPageList.as_view(),
          name='organizer_tag_page'),
      url(r'^(?P<slug>[\w\-]+)/$',
          TagDetail.as_view(),
          name='organizer_tag_detail'),
      url(r'^(?P<slug>[\w-]+)/delete/$',
          TagDelete.as_view(),
          name='organizer_tag_delete'),
      url(r'^(?P<slug>[\w\-]+)/update/$',
          TagUpdate.as_view(),
          name='organizer_tag_update'),
  ]
  
subject: Revert to Tag Detail URL pattern.