SOLVED: Day 49 - Sending and receiving Codable data. Problem with decoder.decode(from) – 100 Days of SwiftUI

SOLVED: Day 49 - Sending and receiving Codable data. Problem with decoder.decode(from)

@diopermanganato

Sep '21

I noticed URLSession retrieves data but it can't be decoded in Response. (The url is correct)

URLSession.shared.dataTask(with: request) { data, response, error in
  if let data = data {
      let decoder = JSONDecoder()
      print(data)
      if let decodedResponse = try? decoder.decode(Response.self, from: data) {
          DispatchQueue.main.async {
              results = decodedResponse.results
          }
          return
      }
  }
  print("Fetch failed: \(error?.localizedDescription ?? "Unknown error")")
}.resume()

struct Result: Codable {
    var trackID: Int
    var trackName: String
    var collectionName: String
}
struct Response: Codable {
    var results: [Result]
}

@roosterboy HWS+

Sep '21

Replace this:

      if let decodedResponse = try? decoder.decode(Response.self, from: data) {
          DispatchQueue.main.async {
              results = decodedResponse.results
          }
          return
      }

with this:

do {
    let decodedResponse = try decoder.decode(Response.self, from: data)
    DispatchQueue.main.async {
        results = decodedResponse.results
    }
    return
} catch {
    print(error)
}

and see what error you get. Using try? masks any error by converting the response to an Optional.

@diopermanganato

Sep '21

Thanks a lot, it seems I mispelled the trackId variable.

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