Parsing Json Show Error keyNotFound Swift - json

Question

i want to Parsing a json but Xcode Show this message : keyNotFound(CodingKeys(stringValue: "Id", intValue: nil), Swift.DecodingError.Context(codingPath: [], debugDescription: "No value associated with key CodingKeys(stringValue: \"Id\", intValue: nil) (\"Id\").", underlyingError: nil))
JSON :
{
"result": [
{
"Id": 5,
"Title": "Test1",
"EnTitle": "Story and Novel"
},
{
"Id": 38,
"Title": "Test2",
"EnTitle": " Motivational"
}
],
"status": {
"message": "Confirm",
"success": true,
"systemDateTime": "2019-11-01T12:07:05+03:30",
"httpStatusCode": 200
}
}
Model :
struct Result : Decodable {
let Id : Int
let Title : String
let EnTitle : String
}
class ResultInitialiser {
let Id : Int
let Title : String
let EnTitle : String
init(Id:Int, Title:String, EnTitle: String) {
self.Id = Id
self.Title = Title
self.EnTitle = EnTitle
}
}
View Controller :
var genresFetch = [Result]()
var structGenresFetch = [ResultInitialiser]()
let headers : HTTPHeaders = ["Token" : "6f8652e3-d9d9-4b34-9455-0fa32e82ec58"]
AF.request(BASE_URL!, method: .get, headers: headers).response { (response) in
do {
self.genresFetch = [try JSONDecoder().decode(Result.self, from: response.data!)]
for eachProduct in self.genresFetch {
let recived_Data = ResultInitialiser(Id: eachProduct.Id, Title: eachProduct.Title, EnTitle: eachProduct.EnTitle)
self.structGenresFetch.append(recived_Data)
print(eachProduct.Title)
DispatchQueue.main.async {
self.tvMainApi.reloadData()
}
}
}catch {
print(error)
}
}

Answer 1

JSONDecoder will try to decode the JSON from the root. At the root level, there are only two keys, results and status. The Decodable type that you have passed to it, Result, has neither of those keys.
You need to create another struct:
struct Response {
let results: [Result]
}
And decode this struct instead:
do {
// notice the change to this line
self.genresFetch = try JSONDecoder().decode(Response.self, from: response.data!).results
...
}catch {
print(error)
}
IMO, you don't need the extra class called ResultInitialiser. What's wrong with just using the struct as your model?

Answer 2

"No value associated with key CodingKeys(stringValue: \"Id\", intValue: nil)
The root of the json contains result key only and doesn't have id or the other keys you submit with your Result struct , so You need
self.genresFetch = try JSONDecoder().decode(Root.self, from: response.data!)
print(self.genresFetch.result)
struct Root : Decodable {
let result : [Result]
}
struct Result: Decodable {
let id: Int
let title, enTitle: String
enum CodingKeys: String, CodingKey {
case id = "Id"
case title = "Title"
case enTitle = "EnTitle"
}
}