Swift Data Model from JSON Response - json

Question

I am running into an issue building the correct data model for the following JSON response.
{
"resources": [
{
"courseid": 4803,
"color": "Blue",
"teeboxtype": "Championship",
"slope": 121,
"rating": 71.4
},
{
"courseid": 4803,
"color": "White",
"teeboxtype": "Men's",
"slope": 120,
"rating": 69.6
},
{
"courseid": 4803,
"color": "Red",
"teeboxtype": "Women's",
"slope": 118,
"rating": 71.2
}
]
}
Here is the current model. No matter what I do I can't seem to get the model populated. Here is also my URL session retrieving the data. I am new to Swift and SwiftUI so please be gentle. I am getting data back however I am missing something.
import Foundation
struct RatingsResources: Codable {
let golfcourserating : [GolfCourseRating]?
}
struct GolfCourseRating: Codable {
let id: UUID = UUID()
let courseID: Int?
let teeColor: String?
let teeboxtype: String?
let teeslope: Double?
let teerating: Double?
enum CodingKeysRatings: String, CodingKey {
case courseID = "courseid"
case teeColor = "color"
case teeboxtype
case teeslope = "slope"
case teerating = "rating"
}
}
func getCoureRating(courseID: String?) {
let semaphore = DispatchSemaphore (value: 0)
print("GETTING COURSE TEE RATINGS..........")
let urlString: String = "https://api.golfbert.com/v1/courses/\(courseID ?? "4800")/teeboxes"
print ("API STRING: \(urlString) ")
let url = URLComponents(string: urlString)!
let request = URLRequest(url: url.url!).signed
let task = URLSession.shared.dataTask(with: request) { data, response, error in
let decoder = JSONDecoder()
guard let data = data else {
print(String(describing: error))
semaphore.signal()
return
}
if let response = try? JSONDecoder().decode([RatingsResources].self, from: data) {
DispatchQueue.main.async {
self.ratingresources = response
}
return
}
print("*******Data String***********")
print(String(data: data, encoding: .utf8)!)
print("***************************")
let ratingsData: RatingsResources = try! decoder.decode(RatingsResources.self, from: data)
print("Resources count \(ratingsData.golfcourserating?.count)")
semaphore.signal()
}
task.resume()
semaphore.wait()
} //: END OF GET COURSE SCORECARD

Answer 1

First of all, never use try? while decoding your JSON. This will hide all errors from you. Use try and an appropriate do/catch block. In the catch block at least print the error.
Looking at your model there seem to be three issues here.
You don´t have an array of RatingsResources in your array. It is just a single instance.
let response = try JSONDecoder().decode(RatingsResources.self, from: data)
RatingsResources is not implemented correct.
let golfcourserating : [GolfCourseRating]?
should be:
let resources: [GolfCourseRating]?
Your coding keys are implemented wrong instead of:
enum CodingKeysRatings: String, CodingKey {
it should read:
enum CodingKeys: String, CodingKey {

Answer 2

You should add enum CodingKey with resources at struct RatingsResources
And decode:
if let response = try? JSONDecoder().decode(RatingsResources.self, from: data) {
// Your response handler
}