Swiift - Decoding json data from server - swift

Question

Im working on a project where I have to display data from a network call. The problem is Im having trouble decoding data the data that I received from the network call and storing it into structs variable to use for other calls. The deadline is coming close and Im not sure why my code does not work. This is json that I receive back
{"result":{"login":{"isAuthorized":true,"isEmpty":false,"userName":{"isEmpty":false,"name":{"firstName":"Jason","lastName":"Test","displayName":"Test, Jason","isEmpty":false,"fullName":"Jason Test"},"canDelete":false,"id":5793,"canModify":false},"username":"test#testable.com"},"parameters":{"isEmpty":false,"keep_logged_in_indicator":false,"username":"test#testable.com"}},"isAuthorized":true,"version":{"major":"2021","minor":"004","fix":"04","display":"2021.004.04","isEmpty":false},"isSystemDown":false,"timestamp":"2021-07-26T20:21:43Z","isSuccess":true}
This is the different struct that I made in my project
struct ApiResponse: Decodable {
let results: Results?
let isAuthorized: Bool?
let version: Version?
let isSystemDown: Bool?
let errors: [serverError]?
let timestamp: Date?
let isSuccess: Bool?
}
// MARK: - Result
struct Results: Decodable {
let login: Login
let parameters: Parameters?
}
// MARK: - Login
struct Login: Decodable {
let isAuthorized, isEmpty: Bool?
let userName: UserName
let username: String?
}
// MARK: - UserName
struct UserName: Decodable {
let isEmpty: Bool?
let name: Name
let canDelete: Bool?
let id: Int
let canModify: Bool?
}
// MARK: - Name
struct Name: Decodable {
let firstName, lastName, displayName: String
let isEmpty: Bool?
let fullName: String
}
// MARK: - Parameters
struct Parameters: Decodable {
let isEmpty, keepLoggedInIndicator: Bool?
let username: String?
enum CodingKeys: String, CodingKey {
case isEmpty
case keepLoggedInIndicator
case username
}
}
// MARK: - Version
struct Version: Decodable {
let major, minor, fix, display: String?
let isEmpty: Bool?
}
// Mark: - Error
struct serverError: Decodable {
let password: String?
}
The code that I am using to decode the json data is this
private func handleResponse<T: Decodable>(result: Result<Data, Error>?, completion: (Result<T, Error>) -> Void) {
guard let result = result else {
completion(.failure(AppError.unknownError))
return
}
switch result {
case .success(let data):
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
print("Server JsonObject response: \(json)")
} catch {
completion(.failure(error))
}
let decoder = JSONDecoder()
// decodes the Server response
guard let response = try? decoder.decode(ApiResponse.self, from: data) else {
print("Something happen here")
completion(.failure(AppError.errorDecoding))
return
}
// Returns if an error occurs
if let error = response.errors {
completion(.failure(AppError.serverError(error)))
return
}
// Decodes the data received from server
if let decodedData = response.results {
completion(.success(decodedData as! T))
} else {
completion(.failure(AppError.errorDecoding))
}
case .failure(let error):
completion(.failure(error))
}
}
If anyone could help me understand why my code isnt working that would be much appreciated.

Answer 1

Your struct is wrong. Try using this?
struct YourAPIData {
struct Root: Codable {
struct Result: Codable {
struct Login: Codable {
let isAuthorized: Bool
let isEmpty: Bool
struct UserName: Codable {
let isEmpty: Bool
struct Name: Codable {
let firstName: String
let lastName: String
let displayName: String
let isEmpty: Bool
let fullName: String
}
let name: Name
let canDelete: Bool
let id: Int
let canModify: Bool
}
let userName: UserName
let username: String
}
let login: Login
struct Parameters: Codable {
let isEmpty: Bool
let keepLoggedInIndicator: Bool
let username: String
private enum CodingKeys: String, CodingKey {
case isEmpty
case keepLoggedInIndicator = "keep_logged_in_indicator"
case username
}
}
let parameters: Parameters
}
let result: Result
let isAuthorized: Bool
struct Version: Codable {
let major: String
let minor: String
let fix: String
let display: Date
let isEmpty: Bool
}
let version: Version
let isSystemDown: Bool
let timestamp: String
let isSuccess: Bool
}
}
and try using
do {
let APIData = try JSONDecoder().decode(YourAPIData.Root.self, from: jsonData)
} catch let jsonErr { print("Error: ", jsonErr) }
And if you would like to display your json (for testing, i suppose?)
if let data = jsonData, let body = String(data: jsonData, encoding: .utf8) {
print(body)
}
} else {
print(error ?? "Unknown error")
}