I get from a Rest API a result in json format. Now I wanna parse this JSON with the JSONDecoder but I don't really understand the structure of my response.
For that I already tried to create structs to get the "name" of "FirstUser".
{
"User":[
{
"FirstUser":{
"name":"John"
},
"Information":"XY",
"SecondUser":{
"name":"Tom"
}
Json
{
"User":[
{
"FirstUser":{
"name":"John"
},
"Information":"XY",
"SecondUser":{
"name":"Tom"
}
}
]
}
Model
// MARK: - Empty
struct Root: Codable {
let user: [User]
enum CodingKeys: String, CodingKey {
case user = "User"
}
}
// MARK: - User
struct User: Codable {
let firstUser: FirstUserClass
let information: String
let secondUser: FirstUserClass
enum CodingKeys: String, CodingKey {
case firstUser = "FirstUser"
case information = "Information"
case secondUser = "SecondUser"
}
}
// MARK: - FirstUserClass
struct FirstUserClass: Codable {
let name: String
}
Parse
do {
let res = try JSONDecoder().decode(Root.self, from: data)
print(res.first?.firstUser.name)
} catch {
print(error)
}
If I create model using previous json Using this link [blog]: http://www.jsoncafe.com to generate Codable structure or Any Format
Model
import Foundation
struct RootClass : Codable {
let user : [Users]?
enum CodingKeys: String, CodingKey {
case user = "User"
}
init(from decoder: Decoder) throws {
let values = try? decoder.container(keyedBy: CodingKeys.self)
user = try? values?.decodeIfPresent([Users].self, forKey: .user)
}
}
struct Users : Codable {
let firstUser : FirstUser?
let information : String?
let secondUser : SecondUser?
enum CodingKeys: String, CodingKey {
case firstUser = "FirstUser"
case information = "Information"
case secondUser = "SecondUser"
}
init(from decoder: Decoder) throws {
let values = try? decoder.container(keyedBy: CodingKeys.self)
firstUser = try? FirstUser(from: decoder)
information = try? values?.decodeIfPresent(String.self, forKey: .information)
secondUser = try? SecondUser(from: decoder)
}
}
struct SecondUser : Codable {
let name : String?
enum CodingKeys: String, CodingKey {
case name = "name"
}
init(from decoder: Decoder) throws {
let values = try? decoder.container(keyedBy: CodingKeys.self)
name = try? values?.decodeIfPresent(String.self, forKey: .name)
}
}
struct FirstUser : Codable {
let name : String?
enum CodingKeys: String, CodingKey {
case name = "name"
}
init(from decoder: Decoder) throws {
let values = try? decoder.container(keyedBy: CodingKeys.self)
name = try? values?.decodeIfPresent(String.self, forKey: .name)
}
}
Parse
do {
let res = try JSONDecoder().decode(RootClass.self, from: data)
print(res?.user?.first?.firstUser?.name ?? "Yours optional value")
} catch {
print(error)
}
try? statements and the catch block in the Parse part make no sense. An optional plus decodeIfPresent plus try? is twice redundant. And also the suggested code generator creates pretty bad code.