Swift ObjectMapper keeps returning ambiguous without more context

Question

I am attempting to use Swift 3 with (ObjectMapper) to map a players array from a given JSON response on a cut-down class object called "Player"; but am finding it difficult to map it.

// Sample JSON
{
    "_meta": {
        ...
    },
    "fixtures": [{
        ...
    }],
    "players": [{
        "name": "Smith",
        "id": "15475-9524",
    }]
} 

However, I am finding it hard to get it to understand how to make it map properly as it always complains that it needs more context.

I am wanting my JSON consumer to get me the list of players then map all the players using Object Mapper into an array.

When I use

var players : Array<Player> = Mapper<Player>().mapArray(JSONArray: res)

It complains

Type of expression is ambiguous without more context

My class is as follows

class Player: NSObject, Mappable {
    var name: String?

    required init?(map: Map) {
        super.init()
    }

    // Mappable
    func mapping(map: Map) {
        name    <- map["name"]
    }
}

I am using AlamoFire to consume the JSON.

Alamofire.request(url).responseJSON(completionHandler: {
    response in

    switch response.result {

    case .success(let JSON):

        guard let res = JSON as? [String:Any] else {
            print ("Can't do this")
            return
        }

        var players : Array<Player> = Mapper<Player>().mapArray(JSONArray: res)

print (players)

    break

    case .failure(let error):
        print("** Request failed with error: \(error) **")
        break
    }

I don't quite understand how to use the ObjectMapper on the array I'm wanting to fetch.

Any assistance on this would be good.

Answer 1

I think you are confusing JSON Dictionary with Player's array.

Try this:

    guard let res = JSON as? [String:Any] else {
        print ("res:Can't do this")
        return
    }

    guard let json_players = res["players"] as? [[String:Any]] else {
        print ("json_players:Can't do this")
        return
    }

    var players : Array<Player> = Mapper<Player>().mapArray(JSONArray: json_players)