Use dynamic CodingKeys to decode JSON in Swift - json

Question

I cant figure out the way to decode this JSON using Swift.
I tried to follow a bunch of tutorials and guides but there is nothing that works for me.
The only things I am able to add static CodingKeys are: "especificaciones", "id", "titulo" and "default"
"especificaciones" : {
"EXTERIOR" : {
"sistema_automatico_de_ajuste_de_altura_para_faros" : {
"id" : "865",
"titulo" : "Sistema automatico de ajuste de altura para faros",
"default" : ""
},
"antena_" : {
"id" : "1366",
"titulo" : "Antena ",
"default" : ""
},
"luces_direccionales_en_espejos_laterales" : {
"id" : "734",
"titulo" : "Luces direccionales en espejos laterales",
"default" : ""
},
"faros_traseros" : {
"id" : "1430",
"titulo" : "Faros traseros",
"default" : ""
},
},
"DIMENSIONES INTERIORES" : {
"espacio_para_las_piernas___delantera_trasera" : {
"id" : "1417",
"titulo" : "Espacio para las piernas - delantera/trasera",
"default" : ""
},
"espacio_para_los_hombros____delantera_trasera" : {
"id" : "1418",
"titulo" : "Espacio para los hombros - delantera/trasera",
"default" : ""
},
"area_de_carga__l_" : {
"id" : "1498",
"titulo" : "Area de carga (L)",
"default" : ""
}
}
}
This is not the whole JSON but probably with this you can get an idea of what I am looking for.

Answer 1

{ "especificaciones": { "RINES Y LLANTAS": { "llantas_delanteras": { "id": "935", "titulo": "Llantas delanteras", "default": "" }
private struct CustomCodingKeys: CodingKey {
var stringValue: String
init?(stringValue: String) {
self.stringValue = stringValue
}
var intValue: Int?
init?(intValue: Int) {
return nil
}
}
struct RootOutput {
var entities:Entities?
var mainRoot:String?
var subRoot:String?
}
struct Root: Decodable {
var rootLevel: SubTopRoot?
init(from decoder: Decoder) {
do{
let container = try decoder.container(keyedBy: CustomCodingKeys.self)
for key in container.allKeys{
rootLevel = try container.decodeIfPresent(SubTopRoot.self, forKey: CustomCodingKeys.init(stringValue: key.stringValue)!)
}
}catch{
print(error.localizedDescription)
}
}
}
struct SubTopRoot: Decodable {
var subTopLevel:SubRoot?
init(from decoder: Decoder) {
do{
let container = try decoder.container(keyedBy: CustomCodingKeys.self)
for key in container.allKeys{
subTopLevel = try container.decodeIfPresent(SubRoot.self, forKey: CustomCodingKeys.init(stringValue: key.stringValue)!)
for index in 0..<(subTopLevel?.SubRootLevel.count ?? 0){
subTopLevel?.SubRootLevel[index].mainRoot = key.stringValue
}
}
}catch{
print(error.localizedDescription)
}
}
}
struct SubRoot: Decodable {
var SubRootLevel:[RootOutput] = [RootOutput]()
init(from decoder: Decoder) {
do{
let container = try decoder.container(keyedBy: CustomCodingKeys.self)
for key in container.allKeys{
let entities = try container.decodeIfPresent(Entities.self, forKey: CustomCodingKeys.init(stringValue: key.stringValue)!)
SubRootLevel.append(RootOutput.init(entities: entities, mainRoot:"" , subRoot: key.stringValue))
}
}catch{
print(error.localizedDescription)
}
}
}
struct Entities: Codable {
var id: String?
var titulo: String?
var defaultItem: String?
init(from decoder: Decoder) {
do{
let container = try decoder.container(keyedBy: CodingKeys.self)
self.id = try container.decodeIfPresent(String.self, forKey: .id)
self.titulo = try container.decodeIfPresent(String.self, forKey: .titulo)
self.defaultItem = try container.decodeIfPresent(String.self, forKey: .defaultItem)
}catch{
print(error.localizedDescription)
}
}
enum CodingKeys: String, CodingKey {
case id = "id"
case titulo = "titulo"
case defaultItem = "default"
}
}
Hope this is helpful for you !
//Dummy Test
do {
let dataString = "{\r\n\t\"especificaciones\": {\r\n\t\t\"RINES Y LLANTAS\": {\r\n\t\t\t\"llantas_delanteras\": {\r\n\t\t\t\t\"id\": \"935\",\r\n\t\t\t\t\"titulo\": \"Llantas delanteras\",\r\n\t\t\t\t\"default\": \"\"\r\n\t\t\t},\r\n\t\t\t\"llantas_traseras\": {\r\n\t\t\t\t\"id\": \"936\",\r\n\t\t\t\t\"titulo\": \"Llantas traseras\",\r\n\t\t\t\t\"default\": \"\"\r\n\t\t\t}\r\n\t\t}\r\n\t}\r\n}"
let data = Data(dataString.utf8)
//here dataResponse received from a network request
let decoder = JSONDecoder()
let model = try decoder.decode(Root.self, from:data) //Decode JSON Response Data
print(model.rootLevel?.subTopLevel?.SubRootLevel)
} catch let parsingError {
print("Error", parsingError)
}
}