Angularfire: how to unsubscribe after snapshotChanges().subscribe?

[sonicwong]

If I added subscribe on value change, how can can I unsubscribe it?
Thanks!

https://github.com/angular/angularfire2/blob/master/docs/rtdb/objects.md#retrieving-the-snapshot
`this.itemRef = db.object('item');

this.itemRef.snapshotChanges().subscribe(action => {

console.log(action.type);

console.log(action.key)

console.log(action.payload.val())

});`

[houfu]

//Subscribe
subscription = this.itemRef.snapshotChanges().subscribe();

//Unsubscribe
subscription.unsubscribe()

[sonicwong]

@houfu, thanks.