def get_urls(self):
        """
        Appends the custom will_not_clone url to the admin site
        """
        not_clone_url = [url(r'^(.+)/will_not_clone/$',
                             admin.site.admin_view(self.will_not_clone))]
        restore_url = [
            url(r'^(.+)/restore/$', admin.site.admin_view(self.restore))]
        return not_clone_url + restore_url + super(VersionedAdmin,
                                                   self).get_urls()
Appends the custom will_not_clone url to the admin site