Swift JSON with dynamic Keys - json

Question

I am trying to parse JSON using Swift, which has dynamic keys. Tried several ways but still did not find the solution. Could you please help me ?
I am trying to parse NativeName, which is dynamic based on which language country name is present.
API: https://restcountries.com/v3.1/all
struct Objects: Codable {
let name: Name
let cca2 : String
let flag: String
}
struct Name: Codable {
let common, official: String
let nativeName: NativeName
}
struct NativeName: Codable {
var deu : Deu
}
struct Deu: Codable {
let official, common: String?
}
and here is JSON Model:
class ParsingService {
static let shared = ParsingService()
func fetchData() {
guard let url = URL(string: "https://restcountries.com/v3.1/all") else {
print("DEBUG: URL is nill")
return}
let session = URLSession.shared
let task = session.dataTask(with: url) { data, _, error in
guard let retrievedData = data, error == nil else {
print("DEBUG: Data is not available")
return}
print("DEBUG: Data is available \(retrievedData)")
guard let decodedData = self.JSONParsing(inputData: retrievedData) else {
print("DEBUG: Missing data")
return}
print("DEBUG: Data is there")
print("DEBUG: \(decodedData[0].cca2)")
print("DEBUG: \(decodedData[0].flag)")
print("DEBUG: \(decodedData[0].name.nativeName.deu.official)")
DispatchQueue.main.async {
print(decodedData.currencies)
}
}
task.resume()
}
func JSONParsing(inputData: Data)-> [Objects]? {
let decoder = JSONDecoder()
do {
let data = try? decoder.decode([Objects].self, from: inputData)
return data
} catch {
print("DEBUG: Cannot get data")
return nil
}
}
}

Answer 1

you could try this approach:
struct ContentView: View {
var body: some View {
Text("testing")
.onAppear {
fetchData() { results in
print("---> results: \(results.count) \n")
for i in 0..<3 {
print("---> results[\(i)]: \(results[i].name.nativeName)")
}
}
}
}
// todo deal with errors
func fetchData(completion: #escaping ([Objects]) -> Void) {
let url = URL(string: "https://restcountries.com/v3.1/all")
guard let url = url else { completion([]); return }
URLSession.shared.dataTask(with: url) { (data, response, error) in
guard let data = data else { completion([]); return }
do {
let results = try JSONDecoder().decode([Objects].self, from: data)
completion(results)
}
catch {
print("Error: \(error)")
completion([])
}
}.resume()
}
}
struct Objects: Codable {
let name: Name
let cca2 : String
let flag: String
}
struct Deu: Codable {
let official, common: String?
}
struct Name: Codable {
let common, official: String
let nativeName: NativeName? // <-- here
}
// -- here
struct NativeName: Codable {
var lang: [String: Deu]
init(from decoder: Decoder) throws {
let container = try decoder.singleValueContainer()
lang = try container.decode([String: Deu].self)
}
func encode(to encoder: Encoder) throws {
// todo
}
}
Note, you could also use a Tuple, such as var lang: (key: String, value: Deu)