public static function unsubscribe($subscriber, $resource)
 {
     $subscriber = self::$r->x->one->subscriber->name($subscriber)->find();
     if (empty($subscriber->id)) {
         return false;
     }
     $resource = self::$r->x->one->resource->path($resource)->find();
     if (empty($resource->id)) {
         return false;
     }
     return self::$r->unassociate($resource, $subscriber);
 }