Decode Json Data using JsonDecoder and Alamofire - swift

Question

I am trying decode Json data into my Model.
This is my model
struct Devices : Codable {
var id :String?
var description :String?
var status : Int?
}
var heroes = Devices()
print(DeviceId)
let loginParam: [String: Any] = [
"id": DeviceId
]
let manager = Alamofire.SessionManager.default
manager.session.configuration.timeoutIntervalForRequest = 5
manager.request("http://13.13.13.004/website/api/Customer/DeviceControl", method: .post , parameters: loginParam, encoding: JSONEncoding.prettyPrinted)
.responseData { response in
let json = response.data
do{
let decoder = JSONDecoder()
//using the array to put values
heroes = try decoder.decode(Devices.self, from: json!)
}catch let err{
print(err)
}
this code doesn't get in catch block.
But heroes values return nill.
When ı try use NsDictionary
Its give result.

Answer 1

This is a common mistake: You forget the root object
struct Root : Decodable {
private enum CodingKeys: String, CodingKey { case resultCount, devices = "results" }
let resultCount : Int
let devices : [Device]
}
And name the device struct in singular form (devices is an array of Device instances) and declare the members as non-optional
struct Device : Decodable {
var id : String
var description : String
var status : Int
}
...
var heroes = [Device]()
...
let result = try decoder.decode(Root.self, from: json!)
heroes = result.devices