building objects from json response using NSJSONSerialization - json

Question

Using swift 1.2, xcode 6.3 and IOS 8, Im trying to build an object from a json response using NSJSONSerialization class.
the json response is:
[{
"_id" : "5470def9e0c0be27780121d7",
"imageUrl" : "https:\/\/s3-eu-west-1.amazonaws.com\/myapi-static\/clubs\/5470def9e0c0be27780121d7_180.png",
"name" : "Mondo",
"hasVip" : false,
"location" : {
"city" : "Madrid"
}
}, {
"_id" : "540b2ff281b30f3504a1c72f",
"imageUrl" : "https:\/\/s3-eu-west-1.amazonaws.com\/myapi-static\/clubs\/540b2ff281b30f3504a1c72f_180.png",
"name" : "Teatro Kapital",
"hasVip" : false,
"location" : {
"address" : "Atocha, 125",
"city" : "Madrid"
}
}, {
"_id" : "540cd44581b30f3504a1c73b",
"imageUrl" : "https:\/\/s3-eu-west-1.amazonaws.com\/myapi-static\/clubs\/540cd44581b30f3504a1c73b_180.png",
"name" : "Charada",
"hasVip" : false,
"location" : {
"address" : "La Bola, 13",
"city" : "Madrid"
}
}]
the object class (Club.swift) with the NSJSONSerialization.JSONObjectWithData implementation is:
class Club: NSObject {
var id: String = ""
var name: String = ""
var imageUrl: String = ""
var hasVip: Bool = false
var desc: String = ""
var location: [Location] = []
init(JSONString: String) {
super.init()
var error : NSError?
let JSONData = JSONString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
let JSONDictionary: NSDictionary = NSJSONSerialization.JSONObjectWithData(JSONData!, options: nil, error: &error) as! NSDictionary
self.setValuesForKeysWithDictionary(JSONDictionary as [NSObject : AnyObject])
}
}
and finally the ApiClient class is
class ApiClient {
func getList(completionHandler: ([JSON]) -> ()) {
let URL = NSURL(string: "https://myapi.com/v1/clubs")
let mutableURLRequest = NSMutableURLRequest(URL: URL!)
mutableURLRequest.setValue("Content-Type", forHTTPHeaderField: "application/json")
mutableURLRequest.HTTPMethod = "GET"
mutableURLRequest.setValue("Bearer R01.iNsG3xjv/r1LDkhkGOANPv53xqUFDkPM0en5LIDxx875fBjdUZLn1jtUlKVJqVjsNwDe1Oqu2WuzjpaYbiWWhw==", forHTTPHeaderField: "Authorization")
let manager = Alamofire.Manager.sharedInstance
let request = manager.request(mutableURLRequest)
request.responseJSON { (request, response, json , error) in
if (json != nil){
var jsonObj = JSON(json!)
if let data = jsonObj["hits"].arrayValue as [JSON]?{
var aClub : Club = Club(JSONString: data)
println(aClub.name)
completionHandler(data)
}
}
}
}
}
but the problem is when I try to println(aClub.name) the error is
"cannot invoke initializer for type'Club' with an argument list of type (JSONString [JSON])"
I dont know, how could I use NSJSONSerialization class with a complex JSON response.

Answer 1

The jsonObj would appear to be a SwiftyJSON object, or something like that, which one uses in lieu of NSJSONSerialization, not in conjunction with it. The data variable is an array of JSON objects (i.e. it's a [JSON]), not a string.
But you're using Alamofire's responseJSON method, which does the JSON parsing for you. So you don't need to use either NSJSONSerialization or SwiftyJSON. It's already parsed it into an array of dictionaries.
If you want an array of Club objects, you could do can just iterate through this array, building Club objects from the dictionaries:
class ApiClient {
func getList(completionHandler: ([Club]?, NSError?) -> ()) {
let URL = NSURL(string: "https://myapi.com/v1/clubs")
let mutableURLRequest = NSMutableURLRequest(URL: URL!)
mutableURLRequest.setValue("Content-Type", forHTTPHeaderField: "application/json")
mutableURLRequest.HTTPMethod = "GET"
mutableURLRequest.setValue("Bearer R01.iNsG3xjv/r1LDkhkGOANPv53xqUFDkPM0en5LIDxx875fBjdUZLn1jtUlKVJqVjsNwDe1Oqu2WuzjpaYbiWWhw==", forHTTPHeaderField: "Authorization")
let manager = Alamofire.Manager.sharedInstance
let request = manager.request(mutableURLRequest)
request.responseJSON { (request, response, json, error) in
var clubs = [Club]()
if let arrayOfDictionaries = json as? [[String: AnyObject]] {
for dictionary in arrayOfDictionaries {
clubs.append(Club(dictionary: dictionary))
}
completionHandler(clubs, nil)
} else {
completionHandler(nil, error)
}
}
}
}
You obviously have to change Club to handle the dictionary object:
class Club {
var id: String!
var name: String!
var imageUrl: String!
var hasVippler: Bool!
var location: [String: String]!
init(dictionary: [String: AnyObject]) {
id = dictionary["_id"] as? String
name = dictionary["name"] as? String
imageUrl = dictionary["imageUrl"] as? String
hasVippler = dictionary["hasVip"] as? Bool
location = dictionary["location"] as? [String: String]
}
}
Finally, your table view controller could call the API:
let apiClient = ApiClient()
var clubs: [Club]!
override func viewDidLoad() {
super.viewDidLoad()
apiClient.getList() { clubs, error in
if clubs != nil {
self.clubs = clubs
self.tableView.reloadData()
} else {
println(error)
}
}
}