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

CodePudding user response：

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 {
  

CodePudding user response：

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
}