updateParking: function(id, data) {
    var ref = firebase.database().ref('parking').child(id);
    var obj = $firebaseObject(ref);
    obj = data;
    obj.$save().then(function(data) {
        console.log(data);
    }, function(error) {
        console.log("Error:", error);
    });
}


Controller:

updateParking: function(id, data) {
     var ref = firebase.database().ref('parking').child(id);
     var obj = $firebaseObject(ref);
     obj = data;
     obj.$save().then(function(data) {
     console.log(data);
    }, function(error) {
       console.log("Error:", error);
    });
}