FB Rules Controller

$scope.get_user_locations = function () {

        firebase.auth().onAuthStateChanged(function (user) {
            if (user) {

                var returned_locations = firebase.database().ref('user_locations/');
                returned_locations.on('value', function (snapshot) {
                    $scope.user_locations = snapshot.val();
                });


            } else {
                $state.go('login');
            }
        });

    };