Download nested JSON from URL and make Observable Object SwiftUI, ERROR: "Missing Argument for parameter 'from' in call" - json

Question

I am trying to download a nested JSON file from an URL. I want to make it Observable Object so that my App will update its view when the download is finished.
Here I have my structures and the class I have created in order to make it an Observable Object. This is also where my Error: "Missing argument in parameter 'from' in call" appears: (Thanks for any help!)
struct SpotDetail: Codable {
var spot: String
var day0: DayDetail
var day1: DayDetail
var day2: DayDetail
enum CodingKeys: String, CodingKey {
case spot = "spot"
case day0 = "day0"
case day1 = "day1"
case day2 = "day2"
}
}
struct DayDetail: Codable {
var date: String
var wind: [Int]
var gust: [Int]
enum CodingKeys: String, CodingKey {
case date = "date"
case wind = "wind"
case gust = "gust"
}
}
class networkSpotData: ObservableObject {
let objectWillChange = ObjectWillChangePublisher()
var WindSpot = SpotDetail() { // ERROR: "Missing Argument for parameter 'from' in call"
willSet {
self.objectWillChange.send()
}
}
}
And the function that downloads from the URL:
extension ContentView {
func loadspotdata(url: String) {
guard let url = URL(string: "https://raw.githubusercontent.com/Bene2907/Bene2907.github.io/main/template.json") else {
return
}
let request = URLRequest(url: url)
URLSession.shared.dataTask(with: request) { data, response, error in
if let data = data {
if let response_obj = try? JSONDecoder().decode(SpotDetail.self, from: data) {
DispatchQueue.main.async {
spotData.WindSpot = response_obj
}
}
}
}.resume()
}
}
Finally I have my view to present the data:
struct ContentView: View {
#ObservedObject var spotData = networkSpotData()
var body: some View {
VStack {
Text("\(spotData.WindSpot.spot)")
.padding()
Text("\(spotData.WindSpot.day0.date)")
.padding()
}.onAppear(perform: {
loadspotdata()
})
}
}

Answer 1

To use default constructor in
var WindSpot = SpotDetail() { // ERROR: "Missing Argument for parameter 'from' in call"
you have to initialize properties with default values in SpotDetail, like
struct SpotDetail: Codable {
var spot: String = ""
var day0: DayDetail = DayDetail() // this also should be initialised properties
...
}