title: How to listen for updates in mongodb with websockets
body: <p>I'm trying to set up a notification system for my web app. Currently, I want to add an extra field to my mongo db, and have this update my front end in real time using socket.io</p>
  
  <p>I know previously mongo had no functionality for listening to updates in its database - but has anything been recently released? Or is there another option to database triggers?</p>