firebase - $firebaseArray $indexFor() not finding key when given value -

i have firebase:

users: {    userid: {       notifications: {          notificationid: "notification"       }    } } 

when given "notification", i'm trying find notificationid (which generated push() method) can delete it. according docs, $indexfor() method should me. here's code:

var ref = new firebase('https://url.firebaseio.com/');  $scope.dismissnotification = function(notification) {    var notificationref = ref.child('users/' + $scope.currentuser.id + '/notifications');    var notifications = $firebasearray(notificationref);    notifications.$loaded().then(function(data) {      console.log(data);      console.log(data.$indexfor(notification));    }).catch(function(error) {      console.log('error: ' + error);    }); }; 

the first log correct object notification string inside i'm looking for, second log returns -1, when want return notificationid associated it.

not sure you're trying accomplish, simplest way find key given value:

var notificationref = ref.child('users/' + $scope.currentuser.id + '/notifications');  var query = notificationref.orderbyvalue().equalto(notification);  query.once('child_added', function(snapshot) {     console.log(snapshot.key()); });