Parsing multi-level JSON with Codable - ios

Question

I'm trying to parse to following JSON into a tableView : https://www.pathofexile.com/api/trade/data/items
I succeeded in parsing the first array, but I'm unable to parse the key "entries"...
Here's my code, with the data structure I defined :
import UIKit
struct ItemCategories: Codable {
var result: [ItemCategory]
}
struct ItemCategory: Codable {
var label: String
var entries: [Item]
}
struct Item: Codable {
// empty struct
}
class ViewController: UITableViewController {
let urlString = "https://www.pathofexile.com/api/trade/data/items"
var categories = [ItemCategory]()
override func viewDidLoad() {
super.viewDidLoad()
title = "Path of Data"
navigationController?.navigationBar.prefersLargeTitles = true
parse()
}
func parse() {
guard let url = URL(string: urlString) else { return }
guard let data = try? Data(contentsOf: url) else { return }
let decoder = JSONDecoder()
guard let jsonItemCategories = try? decoder.decode(ItemCategories.self, from: data) else { return }
categories = jsonItemCategories.result
tableView.reloadData()
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return categories.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
var categoryName = categories[indexPath.row].label
if categoryName == "" { categoryName = "Unknown" }
cell.textLabel?.text = categoryName
cell.textLabel?.textColor = .systemOrange
let numberOfItemsInCategory = String(categories[indexPath.row].entries.count)
cell.detailTextLabel?.text = numberOfItemsInCategory + " items"
return cell
}
}
The struct Item is empty, because when I try to add variable corresponding to the keys in the JSON, then the whole parsing fail (the tableView displays nothing).
When the struct Item is empty, then the parsing succeed and the tableView is able to display the different categories. It even display the number of items for each "entries" thanks to :
let numberOfItemsInCategory = String(categories[indexPath.row].entries.count)
cell.detailTextLabel?.text = numberOfItemsInCategory + " items"
Can someone explain why ? Ideally I would like to display the content of "entries" when the rows are tapped, but I can't figure out how for the moment.
Thanks for you help :)
screenshot

Answer 1

#Laurent Delorme Your Struct Item should be like below, try with this,
struct Item: Codable {
let name: String?
let type: String?
let text: String?
let flags: FlagsRepresentation?
enum CodingKeys: String, CodingKey {
case name
case type
case text
case flags
}
}
struct FlagsRepresentation: Codable {
let unique: Bool?
enum CodingKeys: String, CodingKey {
case unique
}
}