old_contents: from django.conf.urls import patterns, url
  
  from views import CategoryListView, ForumDetailView, TopicDetailView, TopicCreateView
  
  
  urlpatterns = patterns('',
      url(r'^$', CategoryListView.as_view(), name='overview'),
      url(r'^(?P<pk>\d+)/$', ForumDetailView.as_view(), name='forum'),
      url(r'^(?P<forum_id>\d+)/create/$', TopicCreateView.as_view(), name='topic_create'),
      url(r'^topic/(?P<pk>\d+)/$', TopicDetailView.as_view(), name='topic'),
  )
  
new_contents: from django.conf.urls import patterns, url
  
  from views import CategoryListView, ForumDetailView, TopicDetailView, TopicCreateView, PostCreateView
  
  
  urlpatterns = patterns('',
      url(r'^$', CategoryListView.as_view(), name='overview'),
      url(r'^(?P<pk>\d+)/$', ForumDetailView.as_view(), name='forum'),
      url(r'^(?P<forum_id>\d+)/create/$', TopicCreateView.as_view(), name='topic_create'),
      url(r'^topic/(?P<pk>\d+)/$', TopicDetailView.as_view(), name='topic'),
      url(r'^topic/(?P<pk>\d+)/create/$', PostCreateView.as_view(), name='post_create'),
  )
  
subject: add url for post create view