How to get only Array part inside of a json - arrays

Question

Json:
{"photos":{"page":1,"pages":20,"perpage":100,"total":"1941","photo":[{"id":"40270314685","owner":"24843974#N00","secret":"46f5a82bd3","server":"785","farm":1,"title":"Raleigh C Easter 2018-30","ispublic":1,"isfriend":0,"isfamily":0},{"id":"39355840240","owner":"24843974#N00","secret":"eb23dc2e68","server":"816","farm":1,"title":"Raleigh C Easter 2018-31","ispublic":1,"isfriend":0,"isfamily":0},{"id":"40270318535","owner":"24843974#N00","secret":"97c6280b2f","server":"811","farm":1,"title":"Raleigh C Easter 2018-32","ispublic":1,"isfriend":0,"isfamily":0}]},"stat":"ok"}
I only want to get "photo":[{"id":"402703146... part as an array. This is my code
struct GetPhotosOfUser:Decodable{
let id: String
let secret: String
let server: String
let farm: String
enum TopLevelCodingKeys: String, CodingKey {
case photos
}
enum UserCodingKeys: String, CodingKey {
case photo
}
enum SecondCodingKeys: String, CodingKey {
case id
case secret
case server
case farm
}
init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: TopLevelCodingKeys.self)
let userContainer = try container.nestedContainer(keyedBy: UserCodingKeys.self, forKey: .photos)
let userContainer1 = try userContainer.nestedContainer(keyedBy: SecondCodingKeys.self, forKey: .photo)
id = try userContainer1.decode(String.self, forKey: .id)
secret = try userContainer1.decode(String.self, forKey: .secret)
server = try userContainer1.decode(String.self, forKey: .server)
farm = try userContainer1.decode(String.self, forKey: .farm)
}
}
var getphotos = [GetPhotosOfUser]()
func downloadJSON(completed: #escaping () -> ()){
let url = URL(string: "https://www.flickr.com/services/rest/?method=flickr.people.getPhotos&api_key=<api-key>&user_id=24843974#N00&format=json&nojsoncallback=1")
URLSession.shared.dataTask(with: url!) { (data, response, error) in
if error == nil{
do{
self.getphotos = try JSONDecoder().decode([GetPhotosOfUser].self, from: data!)
DispatchQueue.main.async {
completed()
print("Json Baglandi")
print(self.getphotos.count)
}
}catch{
print("JSON Error")
print(error)
}
}
}.resume()
}
But it says ""Expected to decode Array but found a dictionary instead."
Could you please help me ?

Answer 1

You need to decode from the top level so your structs should be like this
struct TopLevel : Decodable {
let photos: SubLevel
}
struct SubLevel: Decodable {
let photo: [GetPhotosOfUser]
}
struct GetPhotosOfUser: Decodable{
let id: String
let secret: String
let server: String
let farm: Int //Obs! I changed the type here
}
and then when decoding you need to change your code to
let result = try JSONDecoder().decode(TopLevel.self, from: data!)
self.getphotos = result.photos.photo