Swift Error- keyNotFound(CodingKeys(stringValue:, intValue: nil), Swift.DecodingError.Context, - ios

Question

I am trying to read off Connecticut coronavirus data from this API JSON File- "https://data.ct.gov/resource/rf3k-f8fg.json" ( but I'm getting this error from excode that says keyNotFound(CodingKeys(stringValue: "covid19TestsReported", intValue: nil), Swift.DecodingError.Context
However this error, only comes up when I try to access the covid_19_tests_reported property of the file.
Here is my code, can someone please tell me what I'm doing wrong.
import UIKit
class StateViewController: UIViewController {
#IBOutlet weak var testRatioLbl: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
getData()
}
fileprivate func getData(){
let url = URL(string: "https://data.ct.gov/resource/rf3k-f8fg.json")!
URLSession.shared.dataTask(with: url){(data, response, error) in
do {
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let users = try decoder.decode([Users].self, from: data!)
print(users)
}
catch {
print(error)
}
}.resume()
}
func didUpdatePrice(tests: String) {
DispatchQueue.main.async {
self.testRatioLbl.text = tests + " tests"
}
}
func didFailWithError(error: Error) {
print(error)
}
}
class Users: Decodable {
let covid19TestsReported: String
enum CodingKeys: String, CodingKey {
case covid19TestsReported = "covid19TestsReported"
}
required init(from decoder:Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
covid19TestsReported = try values.decode(String.self, forKey: .covid19TestsReported)
}
}

Answer 1

update you class.. your key value is "covid_19_tests_reported" not "covid19TestsReported"
because this field is nil in some cases so make it optional
struct Users: Decodable {
let covid19TestsReported: String?
private enum CodingKeys: String, CodingKey {
case covid19TestsReported = "covid_19_tests_reported"
}
}
Also update your getData
fileprivate func getData(){
let url = URL(string: "https://data.ct.gov/resource/rf3k-f8fg.json")!
URLSession.shared.dataTask(with: url){(data, response, error) in
do {
let decoder = JSONDecoder()
let users = try decoder.decode([Users].self, from: data!)
users.forEach { (user) in
if let cases = user.covid19TestsReported {
print(cases)
}
}
}
catch {
print(error)
}
}.resume()
}