Angularfire current logged in user's data - angularjs

Question

I am using Angularfire for my login system and trying to get current logged in user's username for purpose of using in controller. Firts getting uid from $getAuth and sync it with data in database. But what I am trying below is not working.
.factory("Auth", function($firebaseAuth) {
var ref = new Firebase("URL");
return $firebaseAuth(ref);
})
.factory("Konusma", function($firebaseObject) { //When you give user's uid to this factory its gives you user data in database.
return function(xm) {
var ref = new Firebase("URL");
var userdata = ref.child('users').child(xm);
return $firebaseObject(userdata);
}})
.controller("chatCtrl", function(Auth, Konusma) {
var userx = Auth.$getAuth(); //Current logged in user's uid and email
var chatci = function() { //Trying to get current logged in user's username and other data according to uid which is comes from Auth.$getAuth.
Konusma(userx.uid).$loaded().then(function(data){
return data.username;
});
};

Answer 1

As mentioned in comments -
You are trying to get the data before user is authenticated.
So in your controller , instead of :
var userx = Auth.$getAuth();
you can use this :
var userx = {};
Auth.$onAuth(function(authData) {
var userx = authData;
// or bind to scope -
// $scope.authData = authData;
});
this will also update your authData variable every time auth status is change.
Anyway - you still need to call: currentUser = chatci() only after user is loggedIn ,
and not evrey time that auth is change.
The best way is to use it with router, see here : https://www.firebase.com/docs/web/libraries/angular/guide/user-auth.html#section-routers
So the controller is loaded only after auth is success.
But for your example - you can add this to your controller:
Auth.$waitForAuth().then(function(authData){
if (authData){
currentUser = chatci()
}
});