SwifUI : Is my downloaded JSON saved to coreData? - json

Question

I've been messing around with CoreData and this time I'm trying to save my downloaded JSON to core data. I don't get any error until I try to display the list and it would return empty.
Any suggestions would be much appreciated!
Model
struct ArticleData: Identifiable, Decodable {
let id : String
let type : String
let attributes: ArticleAttributee
struct ArticleAttributee: Codable {
let name: String
let card_artwork_url: String
...
}
AttributeArticle+CoreDataProperties.swift
extension AttributeArticle {
#nonobjc public class func fetchRequest() -> NSFetchRequest<AttributeArticle> {
return NSFetchRequest<AttributeArticle>(entityName: "AttributeArticle")
}
#NSManaged public var card_artwork_url: String?
#NSManaged public var content_type: String?
...
public var wrapperCard_artwork_url : String {
card_artwork_url ?? "Unknown"
}
...
}
Download JSOn and load to Core Data
class Article {
static func loadDataFromJSON(completion: #escaping ([ArticleData]) -> ()) {
let stringURL = "https://api.jsonbin.io/b/5ed679357741ef56a566a67f"
guard let url = URL(string: stringURL) else { return }
let request = URLRequest(url: url)
URLSession.shared.dataTask(with: request) {
data, response, error in
guard let data = data else {
print("No data in response \(error?.localizedDescription ?? "No data response")")
return
}
if let decoderLoadedUser = try? JSONDecoder().decode([ArticleData].self, from: data) {
completion(decoderLoadedUser)
}
}.resume()
}
static func loadDataToCD(moc: NSManagedObjectContext) {
loadDataFromJSON { (articles) in
DispatchQueue.main.async {
var tempArticles = [AttributeArticle]()
for article in articles {
let newArticle = AttributeArticle(context: moc)
newArticle.name = article.attributes.name
newArticle.card_artwork_url = article.attributes.card_artwork_url
... so on
...
tempArticles.append(newArticle)
}
do {
try moc.save()
} catch let error {
print("Could not save data: \(error.localizedDescription)")
}
}
}
}
}
my list :
#Environment(\.managedObjectContext) var moc
#FetchRequest(entity: AttributeArticle.entity(), sortDescriptors: []) var articles: FetchedResults<AttributeArticle>
VStack {
List() {
ForEach(articles, id: \.id) { article in
NavigationLink(destination: ArticleDetailView(articles: article)){
ArticleRowView(articles: article)
}
}
}
}.onAppear {
if self.articles.isEmpty {
print("Articles is empty \(self.articles)")
Article.loadDataToCD(moc: self.moc)
}
Sorry for the long post and thank you for your helps!