Converting NSArray to Array in Swift produces nil to the Array Values - arrays

Question

I came into something I would assume is an easy enough problem but somehow I can't think of any way to solve it. It's simply converting an NSArray to an Array, and I think I've done a good job here with this code:
func getTrainingSubCategories(completion: #escaping(Result<[TrainingSubCategory], GetError>) -> Void){
let dataTask = URLSession.shared.dataTask(with: resourceURL){data, _, _ in
guard let jsonData = data else {
completion(.failure(.trainingCategoriesNoDataAvailable))
return
}
do{
let parsedData = try JSONSerialization.jsonObject(with: jsonData) as! [String: Any]
for (key, value) in parsedData {
if key == "categories" {
if let categoriesDictionary: [[String: Any]] = value as? [[String: Any]]{
for categoryDictionary in categoriesDictionary{
for (key, value) in categoryDictionary{
if key == "sub_categories" {
print("1st Type => \(type(of: value)) Value => \(value)")
print("2nd Type => \(type(of: value as? Array<TrainingSubCategory>)) Value => \(value as? Array<TrainingSubCategory>)")
// guard let subCategoryValue = value as? Array<TrainingSubCategory> else{
// fatalError("Error in casting value to array of trainingsubcategory")
// }
}
}
}
}
}
}
}catch {
completion(.failure(.trainingSubCategoriesCannotProcessData))
}
}
dataTask.resume()
}
but the console would log otherwise:
1st Value => (
{
"category_id" = 1;
"company_id" = 50;
"created_at" = "2019-11-07 00:58:37";
"deleted_at" = "<null>";
id = 1;
name = Advertisement;
"updated_at" = "2019-11-07 00:58:37";
},
{
"category_id" = 1;
"company_id" = 50;
"created_at" = "<null>";
"deleted_at" = "<null>";
id = 3;
name = Sales;
"updated_at" = "2019-11-10 23:28:30";
}
)
2nd Value => nil
1st Value => (
{
"category_id" = 2;
"company_id" = 50;
"created_at" = "2019-11-07 19:58:07";
"deleted_at" = "<null>";
id = 6;
name = Inventory;
"updated_at" = "2019-11-07 19:58:07";
}
)
2nd Value => nil
1st Value => (
{
"category_id" = 3;
"company_id" = 50;
"created_at" = "2019-11-10 21:24:22";
"deleted_at" = "<null>";
id = 9;
name = "Human Resource";
"updated_at" = "2019-11-10 21:24:22";
}
)
2nd Value => nil
Am I missing something here? I'm quite new to Swift so I don't actually have much of a guess myself.

Answer 1

So I made the return type simply an array of NSDictionary.
func getTrainingSubCategories(completion: #escaping(Result<[NSDictionary], GetError>) -> Void){
let dataTask = URLSession.shared.dataTask(with: resourceURL){data, _, _ in
guard let jsonData = data else {
completion(.failure(.trainingCategoriesNoDataAvailable))
return
}
var trainingSubCategories = [NSDictionary]()
do{
let parsedData = try JSONSerialization.jsonObject(with: jsonData) as! [String: Any]
for (key, value) in parsedData {
if key == "categories" {
if let categoriesDictionary: [[String: Any]] = value as? [[String: Any]]{
for categoryDictionary in categoriesDictionary{
for (key, value) in categoryDictionary{
if key == "sub_categories" {
if let subCategoriesArray: [Any] = value as? [Any] {
for subCategory in subCategoriesArray{
trainingSubCategories.append(subCategory as! NSDictionary)
}
}
}
}
}
}
}
completion(.success(trainingSubCategories))
}
}catch {
completion(.failure(.trainingSubCategoriesCannotProcessData))
}
}
dataTask.resume()
}
and my function call with the return looks like this:
private func downloadSubCategories(withCompanyID: Int) {
let trainingCategoriesRequest = GetRequests(endpoint: "getTrainingCategories", id: String(withCompanyID))
trainingCategoriesRequest.getTrainingSubCategories{result in
switch result{
case .success(let trainingSubCategories):
for counter in 0 ..< trainingSubCategories.count {
for (key, value) in trainingSubCategories[counter]{
print("\(key) => \(value)")
}
}
case .failure(let error):
print(error)
}
}
}
I was able to map them without casting NSDictionary to TrainingSubCategory. Which, I'm sorry for ya'll looking into the post, is not an answer to the initial question but a workaround. :)