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When you visit my-event/annoucement-title
url this will match share class details
url pattern first and will never reach the announcement
url pattern. To solve this you can do like:
url(r'^class-detail/(?P<event_slug>[\w-]+)/(?P<share_class_slug>[\w-]+)/$', views.share_class_details, name='share class details'),
url(r'^event-announcement/(?P<event_slug>[\w-]+)/(?P<announcement_slug>[\w-]+)/$', views.announcement, name='announcement'),
Now if you visit event-announcement/my-event/annoucement-title
it will match the announcement
url pattern.
Source:stackexchange.com