Hello.
If you wondering how to add PUSH notifications to your RoR based site -
Jeapie can be useful to you.
Gem is already on GitHub GitHub - Jeapie/push-message-for-php5: PHP 5.1 class for push message to jeapie
You just install free mobile client app (iOS, Android). And after that
you can request to Jeapie API.
HTTP POST request instantly becomes native mobile PUSH notification.