javascript - Check if user exists and store his data with Firebase+Angular+Facebook -

i have facebook signup method , want check if user persists in firebase. if is, i'd set data $rootscope.loggedinuser share across controllers.

here's implementation of idea. problem — no data written firebase no redirection performed. seems miss obvious. ideas?

firebase v2.0.4
angularfire 0.9.0
angular 1.2.20

$scope.loginfacebook = function() {     $scope.auth.$authwithoauthpopup("facebook")         .then(function(authdata) {             var userid = authdata.uid              function checkifuserexists(userid) {               (new firebase(users)).child(authdata.uid).once('value', function(snapshot) {                 var exists = (snapshot.val() !== null);                 userexistscallback(userid, exists);               });             }                  function userexistscallback(exists) {               if (exists) {                 var loggedinuser = $firebase(new firebase(users).child(authdata.uid)).$asobject();                 loggedinuser.$loaded().then(function() {                   $rootscope.loggedinuser = loggedinuser;                   $window.location.href = '#/profile';                 });               } else {                   $firebase(new firebase(users).child(authdata.uid))                     .$update({                         "uid": authdata.uid,                         "email": authdata.facebook.email,                         "displayname": authdata.facebook.displayname,                         "image": authdata.facebook.cacheduserprofile.picture.data.url                     })                     .then(function(authdata) {                         $rootscope.loggedinuser = {                             'uid': authdata.uid,                             'email': authdata.facebook.email,                             'displayname': authdata.facebook.displayname,                             'image': authdata.facebook.cacheduserprofile.picture.data.url                         }                         var loggedinuser = $firebase(new firebase(users).child(authdata.uid))                         $rootscope.loggedinuser = loggedinuser.$asobject();                         $window.location.href = '#/profile';                     });               }                                 }     }).catch(function(error) {         console.error("authentication failed:", error);     }); }