How can I use the onDisconnect method with PolymerFire?

Question

Using the Firebase Javascript library, I can use the onDisconnect() method to schedule a database update when the client is disconnected.

Google has released a set of Polymer Elements called PolymerFire, which make hooking Polymer apps and Firebase very easy.

Has anybody figured out how to use the onDisconnect method from inside a Polymer app using PolymerFire?

Answer 1

I found the answer!

So, at the start of my app, I initialized the firebase-app like this:

<firebase-app name="notes" ...></firebase-app>

Then, later in my app, I add a firebase-document to watch my connection status:

<firebase-document app-name="notes" path="/.info/connected" data={{conStatData}}>
</firebase-document>

and I added an observer on conStatData:

observers: ['_conStat(user, conStatData)'],

And finally, the payoff code:

_conStat: function(user, status) {
      if (status === true) {
          firebase.app('notes').database().ref('/presence/' + user.uid).set('online')
          firebase.app('notes').database().ref('/presence/' + user.uid).onDisconnect().set('offline')
      }
  },