Decoding Nested Json, Missing objects using SwiftyJson iOS

Question

Im calling this api to receive single rocket launch event: https://launchlibrary.net/1.4/launch/next/1 using simple Get request. Trying to decode using SwiftyJson (also tried Codable) with lack of success to read the "rocket" -> "imageURL"

here is my code:

struct LaunchHistory {
var launches = [LaunchItem]()

init(with json:JSON) {
    for launch in json["launches"].arrayValue {
        let launchItem = LaunchItem(with: launch)
        launches.append(launchItem)
     }
   }
 }


struct LaunchItem {
let id:Int?
let name: String?
let tbddate: Int?
let status: LaunchStatus?
let rocketImage: String?

init(with json:JSON) {
    self.id = json["id"].int
    self.name = json["name"].string
    self.tbddate = json["tbddate"].int
    self.status = LaunchStatus(rawValue: json["status"].int ?? 0)
    self.rocketImage = json["rocket"]["imageURL"].string
    }
}

when LaunchItem decoded, all i 11 properties/key instead of almost double. the rocket object is missing. what am i missing here?

thanks!

You can follow this link [stackoverflow.com/questions/58374519/looping-through-swiftyjson/… — Farhan Amjad
– Farhan Amjad, Commented Oct 16, 2019 at 10:05

vadian · Accepted Answer · 2019-10-16 10:26:55Z

1

It's pretty easy with (De)Codable

struct Root : Decodable {
    let launches : [LaunchItem]
}

struct LaunchItem : Decodable {
    let id: Int
    let name: String
    let tbddate: Int
    let rocket: Rocket
}

struct Rocket : Decodable {
    let imageURL : URL
}

let url = URL(string: "https://launchlibrary.net/1.4/launch/next/1")!
let task = URLSession.shared.dataTask(with: url) { (data, _, error) in
    if let error = error { print(error); return }
    do {
        let result = try JSONDecoder().decode(Root.self, from: data!)
        print(result.launches.first?.rocket.imageURL ?? "n/a")
    } catch {
        print(error)
    }

}
task.resume()

answered Oct 16, 2019 at 10:26

vadian

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1 Comment

orthehelper Over a year ago

look pretty much as i did (the codable part which i not added), but it works :) thanks for the help. ill try to look into the diffrences

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