Parsing nested json file with decoder - arrays

Question

I am having trouble parsing this json file
{"window":60,"version":200,"timestamp":1582886130,"body":{"totals":{"count":1,"offset":0},"audio_clips":[{"id":7515224,"title":"The West Ham Way Podcast - We`re back!","description":"This is a message from Dave to confirm that the boys are back....\nThe show will be recorded EVERY Wednesday and published on the same night. Please subscribe to this Podcast on your preferred platform and get the West Ham Way back to where they were before it was taken away from them.\nAs always, thanks for your support. COYI!\n#DaveWalkerWHU\n#ExWHUemployee","updated_at":"2020-02-27T11:44:18.000Z","user":{"id":5491115,"username":null,"urls":{"profile":"https://audioboom.com/users/5491115","image":"https://images.theabcdn.com/i/composite/%231c5fc7/150x150/avatars%2Fsmile-1.svg","profile_image":{"original":"https://images.theabcdn.com/i/composite/%231c5fc7/150x150/avatars%2Fsmile-1.svg"}}},"link_style":"channel","channel":{"id":5019730,"title":"The West Ham Way Podcast","urls":{"detail":"https://audioboom.com/channels/5019730","logo_image":{"original":"https://images.theabcdn.com/i/36150002"}}},"duration":32.4895,"mp3_filesize":575908,"uploaded_at":"2020-02-26T13:01:01.000Z","recorded_at":"2020-02-26T13:01:01.000+00:00","uploaded_at_ts":1582722061,"recorded_at_ts":1582722061,"can_comment":false,"can_embed":true,"category_id":283,"counts":{"comments":0,"likes":0,"plays":12},"urls":{"detail":"https://audioboom.com/posts/7515224-the-west-ham-way-podcast-we-re-back","high_mp3":"https://audioboom.com/posts/7515224-the-west-ham-way-podcast-we-re-back.mp3","image":"https://images.theabcdn.com/i/36150892","post_image":{"original":"https://images.theabcdn.com/i/36150892"},"wave_img":"https://images.theabcdn.com/i/w/8560839"},"image_attachment":36150892}]}}
At the moment im just trying to get the title and description from the json but i keep getting error message
keyNotFound(CodingKeys(stringValue: "audioclips", intValue: nil), Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue: "body", intValue: nil)], debugDescription: "No value associated with key CodingKeys(stringValue: \"audioclips\", intValue: nil) (\"audioclips\").", underlyingError: nil))
here is my class for trying to parse the json
import UIKit
class PodcastViewController: UIViewController {
struct Root : Decodable {
var body : Body
}
struct Body : Decodable {
enum Codingkeys : String, CodingKey {
case audioclips = "audio_clips"
}
var audioclips : [Clips]
}
struct Clips : Decodable{
enum CodingKeys : String, CodingKey {
case title = "title"
case description = "description"
}
var title : String
var description : String
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let url = URL(string: "https://api.audioboom.com/channels/5019730/audio_clips?api_version=1")!
URLSession.shared.dataTask(with: url) {data, response, error in
if let data = data {
print("DATA EXISTS")
do {
let result = try JSONDecoder().decode(Root.self, from: data)
print(result)
} catch {
// print("error while parsing:\(error.localizedDescription)")
print(error)
}
}
}.resume()
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destination.
// Pass the selected object to the new view controller.
}
*/
}
Any ideas why it says the audio clips key can not be found even though i am renaming it audio_clips

Answer 1

In order to be detected and used, you coding keys must have the correct name, which is CodingKeys and not Codingkeys (uppercase 'K'):
struct Body : Decodable {
enum CodingKeys : String, CodingKey {
case audioclips = "audio_clips"
}
var audioclips : [Clips]
}

Answer 2

Just replace CodingKeys(uppercase 'K') instead of Codingkeys(lowercase 'K')
enum CodingKeys : String, CodingKey {
case audioclips = "audio_clips"
}

Answer 3

Based on your response, this can be your Codable struct. Try parsing using below struct.
// MARK: - Response
struct Response: Codable {
let window, version, timestamp: Int
let body: Body
}
// MARK: - Body
struct Body: Codable {
let totals: Totals
let audioClips: [AudioClip]
enum CodingKeys: String, CodingKey {
case totals
case audioClips = "audio_clips"
}
}
// MARK: - AudioClip
struct AudioClip: Codable {
let id: Int
let title, audioClipDescription, updatedAt: String
let user: User
let linkStyle: String
let channel: Channel
let duration: Double
let mp3Filesize: Int
let uploadedAt, recordedAt: String
let uploadedAtTs, recordedAtTs: Int
let canComment, canEmbed: Bool
let categoryID: Int
let counts: Counts
let urls: AudioClipUrls
let imageAttachment: Int
enum CodingKeys: String, CodingKey {
case id, title
case audioClipDescription = "description"
case updatedAt = "updated_at"
case user
case linkStyle = "link_style"
case channel, duration
case mp3Filesize = "mp3_filesize"
case uploadedAt = "uploaded_at"
case recordedAt = "recorded_at"
case uploadedAtTs = "uploaded_at_ts"
case recordedAtTs = "recorded_at_ts"
case canComment = "can_comment"
case canEmbed = "can_embed"
case categoryID = "category_id"
case counts, urls
case imageAttachment = "image_attachment"
}
}
// MARK: - Channel
struct Channel: Codable {
let id: Int
let title: String
let urls: ChannelUrls
}
// MARK: - ChannelUrls
struct ChannelUrls: Codable {
let detail: String
let logoImage: Image
enum CodingKeys: String, CodingKey {
case detail
case logoImage = "logo_image"
}
}
// MARK: - Image
struct Image: Codable {
let original: String
}
// MARK: - Counts
struct Counts: Codable {
let comments, likes, plays: Int
}
// MARK: - AudioClipUrls
struct AudioClipUrls: Codable {
let detail: String
let highMp3: String
let image: String
let postImage: Image
let waveImg: String
enum CodingKeys: String, CodingKey {
case detail
case highMp3 = "high_mp3"
case image
case postImage = "post_image"
case waveImg = "wave_img"
}
}
// MARK: - User
struct User: Codable {
let id: Int
let username: String?
let urls: UserUrls
}
// MARK: - UserUrls
struct UserUrls: Codable {
let profile: String
let image: String
let profileImage: Image
enum CodingKeys: String, CodingKey {
case profile, image
case profileImage = "profile_image"
}
}
// MARK: - Totals
struct Totals: Codable {
let count, offset: Int
}