NSKeyedUnarchiver not returning the "nil" - ios

Question

Good day,
I am on the verge of finishing the tutorial app from Code School, and I was really playing around with its archiving and unarchiving the data "to and with a file". So essentially the archiving works, which is the code below.
class func saveOrdersToArchive(cart: Orders) -> Bool {
print(archiveFilePath());
return NSKeyedArchiver.archiveRootObject(cart, toFile: archiveFilePath());
}
The the archiveFilePath() function is implemented this way, it basically creates a file called "cart.archive" and stores it on the simulator's local drive.
class func archiveFilePath() -> String {
let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0];
return documentsDirectory.appendingPathComponent("cart.archive").path;
}
So it creates the file correctly then stores the data of type Orders.
But when I try to retrieve the data with my implementation below, it seems that the returned data is marked as "nil".
class func readOrdersFromArchive() -> Orders? {
print(archiveFilePath());
return NSKeyedUnarchiver.unarchiveObject(withFile: archiveFilePath()) as? Orders
}
So, in the main ViewController file, the saving of the Object is implemented below.
//name
productNames = ["1907 Wall set", "1921 Dial phone"];
//cell Images
productImages = [ #imageLiteral(resourceName: "image-cell1"), #imageLiteral(resourceName: "image-cell2")];
//phone Images
phoneImages = [#imageLiteral(resourceName: "phone-fullscreen1"), #imageLiteral(resourceName: "phone-fullscreen2")];
//price
priceProducts = [1.99, 3.99]
oCartProducts = Product(names: productNames, productImages: productImages, cellImages: phoneImages, priceOfProducts: priceProducts);
order = Orders(order_id: 1, orders: oCartProducts);
print(Orders.saveOrdersToArchive(cart: order));
The function prints to true, to indicate successful archive.
The implementation for retrieving the data is implemented below,
if let order1 = Orders.readOrdersFromArchive(){
order = order1
if let o = order.orders{
if let n = o.names{
print(n.count)
}
}
}
The reason I want to print the "count" is to be able to make sure the unwrapped object has values, but the code doesn't go there meaning the object is nil.
I am doing so init in the ViewController before storing the variables as follows,
var oCartProducts = Product(names: [String](), productImages: [UIImage](), cellImages: [UIImage](), priceOfProducts: [Double]());
var order = Orders(order_id: Int(), orders: Product(names: [String](), productImages: [UIImage](), cellImages: [UIImage](), priceOfProducts: [Double]()));
Showing Orders Class,
class Orders : NSObject, NSCoding{
var order_id: Int?
var orders: Product?
init(order_id: Int?, orders: Product?){
self.order_id = order_id;
self.orders = orders;
}
required init?(coder aDecoder: NSCoder) {
self.orders = aDecoder.decodeObject(forKey: "orders") as? Product
self.order_id = aDecoder.decodeInteger(forKey: "order_id")
}
func encode(with aCoder: NSCoder) {
aCoder.encode(self.order_id);
aCoder.encode(self.orders);
}
class func archiveFilePath() -> String {
let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0];
return documentsDirectory.appendingPathComponent("cart.archive").path;
}
class func readOrdersFromArchive() -> Orders? {
print(archiveFilePath());
return NSKeyedUnarchiver.unarchiveObject(withFile: archiveFilePath()) as? Orders
}
class func saveOrdersToArchive(cart: Orders) -> Bool {
print(archiveFilePath());
return NSKeyedArchiver.archiveRootObject(cart, toFile: archiveFilePath());
}
Showing Product Class,
class Product: NSObject, NSCoding {
var names: [String]?
var productImages: [UIImage]?
var cellImages: [UIImage]?
var priceOfProducts: [Double]?
init(names: [String]?, productImages: [UIImage]?, cellImages: [UIImage]?, priceOfProducts: [Double]?) {
self.names = names;
self.productImages = productImages;
self.cellImages = cellImages;
self.priceOfProducts = priceOfProducts;
}
required init?(coder aDecoder: NSCoder) {
self.names = aDecoder.decodeObject(forKey: "names") as? [String];
self.productImages = aDecoder.decodeObject(forKey: "productNames") as? [UIImage];
self.cellImages = aDecoder.decodeObject(forKey: "cellImages") as? [UIImage];
self.priceOfProducts = aDecoder.decodeObject(forKey: "priceOfProducts") as? [Double];
}
func encode(with aCoder: NSCoder) {
aCoder.encode(self.names);
aCoder.encode(self.productImages);
aCoder.encode(self.cellImages);
aCoder.encode(self.priceOfProducts);
}
}
Hope you can shed some light.

Answer 1

Show us your Orders class. Does it conform to NSCoding?
func encode(with aCoder: NSCoder) {
if let id = self.order_id {
aCoder.encode(self.order_id, forKey: "order_id")
}
if let orders = self.orders {
aCoder.encode(self.orders, forKey: "orders")
}
}