Parse JSON data in swift - json

Question

I am trying to parse my json data in swift 3.0. I am using Alamofire 4.0+
Here is my json
{
"token":
"eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJleHAiOjE1MDQ0MjgzNzgxMTF9.CNonyvtQbRgaqqkdPO5KwqpVaUmlGrpaTqlBxmvaX80",
"expires": 1504428378111,
"user":
[{"user_id":13,"user_first_name":"Himanshu","user_last_name":"Srivastava","full_name":"Himanshu Srivastava"}]
}
Here is my model class to hold these values
import Foundation
import ObjectMapper
class LoginResult:Mappable{
var token:String?
var expires:Double?
var users:[[String:Any]]?
required init?(map:Map){
}
func mapping(map:Map)->Void{
self.token <- map["token"]
self.expires <- map["expires"]
self.users <- map["user"]
}
}
None of the solution available on internet worked for me. How can I parse this json and map to the model class?
Any help here?

Answer 1

I was mistaken, the value for key user is indeed a regular array.
This is a solution without a third party mapper and with an extra User struct (by the way the value for key expires is an Int rather than Double).
Assuming the user data comes from a database which always sends all fields the user keys are forced unwrapped. If this is not the case use optional binding also for the user data:
struct User {
let firstName : String
let lastName : String
let fullName : String
let userID : Int
}
class LoginResult {
let token : String
let expires : Int
var users = [User]()
init(json : [String:Any]) {
self.token = json["token"] as? String ?? ""
self.expires = json["expires"] as? Int ?? 0
if let users = json["user"] as? [[String:Any]] {
self.users = users.map { User(firstName: $0["user_first_name"] as! String,
lastName: $0["user_last_name"] as! String,
fullName: $0["full_name"] as! String,
userID: $0["user_id"] as! Int)
}
}
}
}
let json = "{\"token\":\"eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJleHAiOjE1MDQ0MjgzNzgxMTF9.CNonyvtQbRgaqqkdPO5KwqpVaUmlGrpaTqlBxmvaX80\",\"expires\":504428378111,\"user\":[{\"user_id\":13,\"user_first_name\":\"Himanshu\",\"user_last_name\":\"Srivastava\",\"full_name\":\"Himanshu Srivastava\"}]}"
let jsonData = json.data(using: .utf8)!
do {
if let userData = try JSONSerialization.jsonObject(with: jsonData) as? [String:Any] {
let loginResult = LoginResult(json: userData)
print(loginResult.users[0])
// do something with loginResult
}
} catch {
print(error)
}

Answer 2

Here is the answer with map replaced by dictionary. Don't forget to handle error or unwrap carefully :)
let str = "{\"token\": \"eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJleHAiOjE1MDQ0MjgzNzgxMTF9.CNonyvtQbRgaqqkdPO5KwqpVaUmlGrpaTqlBxmvaX80\",\"expires\": 1504428378111,\"user\": [{\"user_id\":13,\"user_first_name\":\"Himanshu\",\"user_last_name\":\"Srivastava\",\"full_name\":\"Himanshu Srivastava\"}]}"
let data = str.data(using: .utf8)
do{
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? [String: Any]
//Pass this json into the following function
}catch let error{
}
func mapping(json:[String: Any]?)->Void{
self.token <- json?["token"] as? String
self.expires <- json?["expires"] as? Double
self.users <- json?["user"] as? [[String: Any]]
}