parsing two different object's array from JSON response - ios

Question

I'm trying to parse JSON data .. i know how to do it for one object array .. but i don't know how to do it for a response which has to two arrays of different objects ..
for example this is the JSON:
{
"shifts": [
{
"id": 4,
"region": "Eastren",
"city": "Khobar",
"nationality": "1",
"id_service": 2,
"shift_date": "2018-04-05",
"shift_type": "night",
"weekday": "sunday",
"quantity_staff": 8,
"lead_hours": 2,
"created_at": "2018-04-23 11:46:20",
"updated_at": "2018-04-24 08:46:14",
"deleted_at": null
},
{
"id": 5,
"region": "Eastren",
"city": "Khobar",
"nationality": "Phili",
"id_service": 2,
"shift_date": "2018-04-04",
"shift_type": "night",
"weekday": "sunday",
"quantity_staff": 8,
"lead_hours": 2,
"created_at": "2018-04-23 11:47:25",
"updated_at": "2018-04-23 12:53:05",
"deleted_at": "2018-04-23"
}
],
"prices": [
{
"id": 1,
"id_service": 2,
"nationality": "Phili",
"price": 150,
"created_at": "2018-04-23 11:43:40",
"updated_at": "2018-04-23 11:43:40",
"deleted_at": null
}
]
}
it has two array of objects .. shifts and prices .. how to parse each one of them?
my function:
func GetShiftsAndPrices(id: Int){
let todosEndpoint: String = "my link"
guard let todosURL = URL(string: todosEndpoint) else {
print("Error: cannot create URL")
return
}
var todosUrlRequest = URLRequest(url: todosURL)
todosUrlRequest.httpMethod = "POST"
todosUrlRequest.addValue("application/json", forHTTPHeaderField: "Content-Type")
let newTodo: [String: Any] = ["id_service": id]
let jsonTodo: Data
do {
jsonTodo = try JSONSerialization.data(withJSONObject: newTodo, options: [])
todosUrlRequest.httpBody = jsonTodo
} catch {
print("Error: cannot create JSON from todo")
return
}
let session = URLSession.shared
let task = session.dataTask(with: todosUrlRequest) {
(data, response, error) in
guard error == nil else {
print("error calling POST on /public/api/login_customer")
print(error!)
return
}
guard let responseData = data else {
print("Error: did not receive data")
return
}
// parse the result as JSON, since that's what the API provides
do {
//WHAT SHOULD I DO HERE?
print("Success!")
} catch {
print("error parsing response from POST")
return
}
}
task.resume()}
}
I have classes for both shift and price .. and know how to get each one if it was alone in a response .. like:
shifts:
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let shifts1 = try decoder.decode([Shifts].self, from: responseData)
var shifts = [Shift]()
for shift in shifts1{
let newshift = Shift(id: shift.id, region: shift.region, city: shift.city, nationality: shift.nationality, idService: shift.idService, shiftDate: shift.shiftDate, shiftType: shift.shiftType, weekday: shift.weekday, quantityStaff: shift.quantityStaff, leadHours: shift.leadHours)
shifts.append(newshift)
}
let userDefaults = UserDefaults.standard
let encodedData: Data = NSKeyedArchiver.archivedData(withRootObject: shifts)
userDefaults.set(encodedData, forKey: "shifts")
userDefaults.synchronize()
let decoded = userDefaults.object(forKey: "shifts") as! Data
let decodedShift = NSKeyedUnarchiver.unarchiveObject(with: decoded) as! [Shift]
for shift in decodedShift {
print(shift.id)
}
prices:
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let prices1 = try decoder.decode([Prices].self, from: responseData)
print("1")
var prices = [Price]()
for price in prices1{
let newprice = Price(id: price.id, idService: price.idService,nationality: price.nationality, price: price.price)
print("2")
prices.append(newprice)
print(newprice.nationality)
}
let userDefaults = UserDefaults.standard
let encodedData: Data = NSKeyedArchiver.archivedData(withRootObject: prices)
userDefaults.set(encodedData, forKey: "prices")
userDefaults.synchronize()
let decoded = userDefaults.object(forKey: "prices") as! Data
let decodedPrice = NSKeyedUnarchiver.unarchiveObject(with: decoded) as! [Price]
for price in decodedPrice {
print(price.nationality)
}
how to parse them both in one JSON response.. I'm new to this.. can someone please tell me how to do it?

Answer 1

Use an umbrella struct
struct Root : Decodable {
let shifts : [Shift]
let prices : [Price]
}
and two different structs for shifts and prices:
struct Shift : Decodable {
let id: Int
let region, city, nationality : String
let idService : Int
let shiftDate, shiftType, weekday : String
let quantityStaff, leadHours : Int
let createdAt, updatedAt : String
let deletedAt : String?
}
struct Price : Decodable {
let id, idService : Int
let nationality : String
let price : Int
let createdAt, updatedAt : String
let deletedAt : String?
}
To decode the JSON write
do {
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let result = try decoder .decode(Root.self, from: responseData)
print(result.prices)
print(result.shifts)
} catch { print(error) }
Further I recommend to decode keys like shiftType and weekday directly into an enum for example
enum ShiftType : String, Decodable {
case day, night
}
struct Shift : Decodable {
let id: Int
...
let shiftType : ShiftType
...

Answer 2

let shifts = responseJson.valueFor(key:"shifts") as? [String] ?? []
let prices = responseJson.valueFor(key:"prices") as? [String] ?? []
print("\(shifts) and \(prices)")