getting JSON Data with Swift 4 and Xcode 9 - json

Question

I've been trying to work with the below code to get my JSON data. It returns "Error after loading". I am using this JSON data in another application and it works. I'm trying to implement the new simplified method using Swift 4. The code does work to the point of the print statement "downloaded".
class MortgageRatesVC: UIViewController {
final let url = URL (string:"http://mortgous.com/JSON/currentRatesJSON.php")
override func viewDidLoad() {
super.viewDidLoad()
downloadJason()
}
func downloadJason () {
guard let downloadURL = url else { return }
URLSession.shared.dataTask(with: downloadURL) { data, urlResponse, error in
guard let data = data, error == nil, urlResponse != nil else {
print("Oops Call for Help")
return
}
print("downloaded")
do
{
let decoder = JSONDecoder()
let rates = try decoder.decode([LenederRates].self, from: data)
print(rates)
} catch {
print("Error after loading")
}
}.resume()
}
}
Class
class LenederRates: Codable {
let key : String
let financial_institution : String
let variable_rate : String
let six_months : String
let one_year : String
let two_year : String
let three_year : String
let four_year : String
let five_year : String
// let date : Date
init(key: String, financial_institution: String, variable_rate: String, six_months: String, one_year: String, two_year: String, three_year: String, four_year: String, five_year: String) {
self.key = key
self.financial_institution = financial_institution
self.variable_rate = variable_rate
self.six_months = six_months
self.one_year = one_year
self.two_year = two_year
self.three_year = three_year
self.four_year = four_year
self.five_year = five_year
}
}

Answer 1

The problem is the missing property date in your Codable class. You need to set the decoder dateDecodingStrategy to .formatted and pass a fixed format dateFormatter. Btw I suggest changing your class for a struct, change your property names using the Swift naming convention camelCase and provide the custom CodingKeys:
struct LenederRates: Codable {
let key: String
let financialInstitution : String
let variableRate: String
let sixMonths: String
let oneYear: String
let twoYear: String
let threeYear: String
let fourYear: String
let fiveYear: String
let date: Date
private enum CodingKeys: String, CodingKey {
case key, financialInstitution = "financial_institution", variableRate = "variable_rate", sixMonths = "six_months", oneYear = "one_year", twoYear = "two_year", threeYear = "three_year", fourYear = "four_year", fiveYear = "five_year", date
}
}
let mortgousURL = URL(string:"http://mortgous.com/JSON/currentRatesJSON.php")!
URLSession.shared.dataTask(with: mortgousURL) { data, urlResponse, error in
guard let data = data else { return }
do {
let dateFormat = DateFormatter()
dateFormat.locale = Locale(identifier: "en_US_POSIX")
dateFormat.dateFormat = "yyyy-MM-dd"
let decoder = JSONDecoder()
decoder.dateDecodingStrategy = .formatted(dateFormat)
let rates = try decoder.decode([LenederRates].self, from: data)
print(rates)
} catch {
print(error)
}
}.resume()