Swift: key not found JSON decoding

Question

I am trying to decode a JSON object, from this website: https://www.thesportsdb.com/api/v1/json/1/search_all_leagues.php?c=France&s=Soccer

I would like to store them in an array of Soccer elements, and show them in cells.

This is the code I did, but I have key not found errors, how is that possible?

class Soccer: Codable {
    
    var strLeague: String
    var strDescriptionEN: String
    var strBadge: String
    var strDivision: String
    var intFormedYear: String
    var strCountry: String
    
    init(strLeague: String, strDescriptionEN: String, strBadge: String, strDivision: String, intFormedYear: String, strCountry: String) {
        self.strLeague = strLeague
        self.strDescriptionEN = strDescriptionEN
        self.strBadge = strBadge
        self.strDivision = strDivision
        self.intFormedYear = intFormedYear
        self.strCountry = strCountry
    }
}

class SoccerTVC: UITableViewController {
    
    var leagues = [Soccer]()

    func download(at url: String, handler: @escaping (Data?) -> Void)
    {
        // 1 - Create URL
        guard let url = URL(string: url) else {
            debugPrint("Failed to create URL")
            handler(nil)
            return
        }
        // 2 - Create GET Request
        var request: URLRequest = URLRequest(url: url)
        request.httpMethod = "GET"
        // 3 - Create download task, handler will be called when request ended
        let task = URLSession.shared.dataTask(with: request) {
            (data, response, error) in handler(data)
        }
        task.resume()
    }
    
    func getSoccer() {
        // 1 - Download Soccer
        download(at: "https://www.thesportsdb.com/api/v1/json/1/search_all_leagues.php?c=France&s=Soccer")
        { (SoccerData) in
            if let Soccerdata = SoccerData {
                // 2 - Decode JSON into a array of Game object
                let decoder: JSONDecoder = JSONDecoder()
                do {
                    let jsonData = [try decoder.decode(Soccer.self, from: Soccerdata)]
                    self.leagues = jsonData
                    debugPrint(self.leagues)
                    
                    DispatchQueue.main.sync {
                        self.tableView.reloadData()
                    }
                }
                catch {
                    debugPrint("Failed to parse data - error: \(error)")
                }
            }
            else
            {
                debugPrint("Failed to get soccer data")
            }
        }
    }
    
    override func viewDidLoad() {
        getSoccer()
        super.viewDidLoad()
    }
}

Error message:

Failed to parse data - error: keyNotFound(CodingKeys(stringValue: "strLeague", intValue: nil), Swift.DecodingError.Context(codingPath: [], debugDescription: "No value associated with key CodingKeys(stringValue: \"strLeague\", intValue: nil) (\"strLeague\").", underlyingError: nil))

Here read this. https://developer.apple.com/documentation/foundation/archives_and_serialization/encoding_and_decoding_custom_types — Desdenova, Jun 25 '20 at 13:45
Paste your json into [app.quicktype.io](https://app.quicktype.io) and it will give you the correct structs to use for decoding. — koen, Jun 25 '20 at 13:54

Omer Tekbiyik · Accepted Answer · 2020-06-25T14:00:13.293

0

Your desired values is in country array key so you need to change your struct with :

struct Soccer: Codable {
  let countrys : [Country]?
}

  struct Country : Codable{
  var strLeague: String
  var strDescriptionEN: String
  var strBadge: String
  ....
      }

And you need to change your json decoder like :

 var leagues = [Country]()

 let jsonData = try decoder.decode(Soccer.self, from: Soccerdata)
 self.leagues = jsonData.countrys

  }

edited Jun 25 '20 at 14:00

answered Jun 25 '20 at 13:41

Omer Tekbiyik

4,255
1
15
27

oh, nice, but could you also provide the init method ? – volvic2L Jun 25 '20 at 13:44
@volvic2L You don't seem to need init. You may need custom coding keys depending on you json though. – Desdenova Jun 25 '20 at 13:46
I don't get it how I am supposed to retrieve the strLeague string from the leagues array – volvic2L Jun 25 '20 at 13:51
just gonna call `leagues[index].strLeague` – Omer Tekbiyik Jun 25 '20 at 13:52
can you try again @volvic2L – Omer Tekbiyik Jun 25 '20 at 13:56
I forgot to change something now its done . Sorry I haven't slept for 1 day :) – Omer Tekbiyik Jun 25 '20 at 14:02
Sorry please provide me a working init method I am stuck, I get Instance member 'current_league' cannot be used on type 'SoccerDetailVC', because I have not initialized this class – volvic2L Jun 25 '20 at 14:38
@volvic2L What are `current_league` and `SoccerDetailVC`? There is no mention of it in your question. Please post a new question regarding the new issue. See also [ask]. – koen Jun 26 '20 at 11:19

score 0 · Answer 2 · answered Jun 25 '20 at 13:49

0

Try this instead:

let jsonData = try JSONDecoder().decode([String:[Soccer]].self, from: Soccerdata)
self.leagues = jsonData.values

answered Jun 25 '20 at 13:49

pawello2222

46,897
22
145
209

Swift: key not found JSON decoding

2 Answers2