code: def make_unpublished(self, request, queryset):
          
          rows_updated = queryset.update(is_published=False)
          self.message_user(request,
                            ungettext('%(count)d newsitem was unpublished',
                                      '%(count)d newsitems were unpublished',
                                      rows_updated) % {'count': rows_updated})
docs: Marks selected news items as unpublished