Instance method requires that 'classname' conform to 'Decodable' - swift

Question

I'm trying to decode a JSON response as a custom type, that I believe conforms to Decodable.
These are the codable structs that I am using
struct ResultSet: Codable {
var name: String
var headers: [String]
var rowSet: [String]
}
struct Scoreboard: Codable {
var resultSets: [ResultSet]
}
And this is the code I'm using to get the JSON from the response
func loadNbaScoreboardData<Scoreboard>() -> Scoreboard {
//var data1: Data
let formatter = DateFormatter()
formatter.dateFormat = "MM/dd/yyyy"
let formattedDate = formatter.string(from: Date())
let url = URL(string: "https://stats.nba.com/stats/scoreboard/?GameDate=\(formattedDate)&LeagueID=00&DayOffset=100")
var request = URLRequest(url: url!)
request.httpMethod = "GET"
request.setValue("stats.nba.com", forHTTPHeaderField: "host")
request.setValue("application/json", forHTTPHeaderField: "Accept")
request.setValue("stats", forHTTPHeaderField: "x-nba-stats-origin")
request.setValue("x-nba-stats-origin", forHTTPHeaderField: "Referer")
var retData: Scoreboard
URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data else{ return }
do {
let decodedData = try JSONDecoder().decode(Scoreboard.self, from: data)
retData = decodedData
} catch {
fatalError(error)
}
}.resume()
return retData
}
The error I get is Instance method 'decode(_:from:)' requires that 'Scoreboard' conform to 'Decodable'
I'm following the dev documentation here too https://developer.apple.com/documentation/foundation/archives_and_serialization/encoding_and_decoding_custom_types
What am I doing wrong here?
EDIT: The Scoreboard struct can't be found. I've added the full method

Answer 1

In your code Scoreboard is a generic type (not the concrete type Scoreboard). You can fix the error by adding Codable conformance
func loadNbaScoreboardData<Scoreboard: Codable>() -> Scoreboard {
But the code won't work anyway because you cannot return something from an asynchronous task.
I recommend to make the function async
func loadNbaScoreboardData() async throws -> Scoreboard {
//var data1: Data
let formatter = DateFormatter()
formatter.dateFormat = "MM/dd/yyyy"
let formattedDate = formatter.string(from: Date())
let url = URL(string: "https://stats.nba.com/stats/scoreboard/?GameDate=\(formattedDate)&LeagueID=00&DayOffset=100")
var request = URLRequest(url: url!)
request.httpMethod = "GET"
request.setValue("stats.nba.com", forHTTPHeaderField: "host")
request.setValue("application/json", forHTTPHeaderField: "Accept")
request.setValue("stats", forHTTPHeaderField: "x-nba-stats-origin")
request.setValue("x-nba-stats-origin", forHTTPHeaderField: "Referer")
let (data, _ ) = try await URLSession.shared.data(for: request)
return try JSONDecoder().decode(Scoreboard.self, from: data)
}

Answer 2

It was the method declaration
It should be
func loadNbaScoreboardData() -> Scoreboard {
// code
}