How to Convert a model object into JSON - Swift 4 - ios

Question

How to Convert a model object into JSON?
I want "Answer" object.
// Answers Class
class Answers {
var cat_id: String!
var responses = [Response]()
var date: String!
var comment: String!
var time: String!
var lat: String!
var lon: String!
var address: String!
}
// Response Class
class Response {
var que_id: String!
var question: String!
var response: String!
}

Answer 1

Make both types conform to Codable:
class Answers: Codable {
...
}
class Response: Codable {
...
}
And then use JSONEncoder:
let answers: Answers = ...
do {
let data = try JSONEncoder().encode(answers)
// use data here
} catch {
print(error)
}
See Encoding and Decoding Custom Types.

Answer 2

if you are using swift4, You can use encodable and decodable protocol. I'm still working on a heterogeneous list of objects. But this should work for you. Make your class conform to ABEncodable.
protocol ABDecodable: Decodable {
static func decodeFromData(_ data: Data) -> Decodable?
}
protocol ABEncodable: Encodable {
static func encodeFromObject<T>(_ object: T) -> Data? where T: Encodable
}
extension ABDecodable {
static func decodeFromData(_ data: Data) -> Decodable? {
do {
return try JSONDecoder().decode(self, from: data)
}
catch {
print(error)
}
return nil
}
}
extension ABEncodable {
static func encodeFromObject<T>(_ object: T) -> Data? where T: Encodable {
do {
return try JSONEncoder().encode(object)
}
catch {
return nil
}
}
}
//MARK: Decode mapper class
//Send jsonString or data to decode it into an required Object
final class Decode<T: Decodable> {
private func decodeData(_ data: Data) -> T? {
if let klass = T.self as? ABDecodable.Type {
if let object = klass.decodeFromData(data) as? T {
return object
}
}
else {
do {
return try JSONDecoder().decode(T.self, from: data)
}
catch {
print(error)
}
}
return nil
}
func fromJsonString(_ json: String) -> T? {
guard let data = json.data(using: String.Encoding.utf8) else { return nil }
if let object = decodeData(data) {
return object
}
return nil
}
func fromData(_ data: Data) -> T? {
if let object = decodeData(data) {
return object
}
return nil
}
}
//MARK: Encode mapper class
//Send jsonString or data to decode it into an required Object
final class Encode<N:Encodable> {
private func encodeObject(_ object: N) -> Data? {
if let klass = N.self as? ABEncodable.Type {
if let data = klass.encodeFromObject(object) {
return data
}
}
else {
do {
return try JSONEncoder().encode(object)
}
catch {
print(error)
}
}
return nil
}
func toJsonString(_ object: N) -> String? {
if let data = encodeObject(object) {
return String(data: data, encoding: .utf8)
}
return nil
}
func toData(_ object: N) -> Data? {
if let data = encodeObject(object) {
return data
}
return nil
}
}