How to deserialize JSON in swift - json

Question

I want to decode a JSON file into model objects. Unfortunately it doesn't work in the right way. So I don't get errors, but the "decoding-result" don't corresponds to my expectations.
I have the following JSON file and I want to decode it in the shown structs. I have trimmed the json file. Why get I just one "slider image" instead of 5 (the property image of ImagesSlider contains an array with just the first image/element).
What am I missing?
JSON:
[{"imageSlider" : [{
"image" : [{
"imageId" : "1",
"imageName" : "germany1",
"imageBigName" : "germany1_BIG",
"imageRights" : "Peter"
}],
"image" : [{
"imageId" : "2",
"imageName" : "germany2",
"imageBigName" : "germany2_BIG",
"imageRights" : "Peter"
}],
"image" : [{
"imageId" : "3",
"imageName" : "germany3",
"imageBigName" : "germany3_BIG",
"imageRights" : "Peter"
}],
"image" : [{
"imageId" : "4",
"imageName" : "germany4",
"imageBigName" : "germany4_BIG",
"imageRights" : "Peter"
}],
"image" : [{
"imageId" : "5",
"imageName" : "germany5",
"imageBigName" : "germany5_BIG",
"imageRights" : "Peter"
}]
}]
}]
Swift:
struct CountryModel : Decodable, Equatable {
var countryName : String
var inhabitants : String
var capital : String
var currency : String
var imageName : String
var imageSlider: [ImagesSlider]
}
struct ImagesSlider : Decodable, Equatable {
var image: [Image]
}
struct Image : Decodable, Equatable {
var imageId: String
var imageName: String
var imageBigName: String
var imageRights: String
}
Decoding:
func loadData() -> [CountryModel] {
var data: Data
guard let file = Bundle.main.url(forResource: "data", withExtension: "json") else {
fatalError("Error")
}
data = try! Data(contentsOf: file)
let decoder = JSONDecoder()
return try! decoder.decode([CountryModel].self, from: data)
}
Thanks for your help...
Edit:
My question isn't solved by the linked question...

Answer 1

The json looks wrong, remember that you should have only one unique key per json object. Right now is:
[
{
"imageSlider": [
{
"image": [
{
"imageId": "1",
"imageName": "germany1",
"imageBigName": "germany1_BIG",
"imageRights": "Peter"
}
],
"image": [
{
"imageId": "2",
"imageName": "germany2",
"imageBigName": "germany2_BIG",
"imageRights": "Peter"
}
]
}
]
}
]
And it should be like this:
[
{
"imageSlider": [
{
"image": [
{
"imageId": "1",
"imageName": "germany1",
"imageBigName": "germany1_BIG",
"imageRights": "Peter"
},
{
"imageId": "2",
"imageName": "germany2",
"imageBigName": "germany2_BIG",
"imageRights": "Peter"
}
]
}
]
}
]
Notice that "germany2" item is inside of the array of image.
let decoder = JSONDecoder()
let jsonData = Data(jsonString.utf8)
do {
let country = try decoder.decode([CountryModel].self, from: jsonData)
print(country[0].imageSlider[0].image.count)
} catch {
print(error.localizedDescription)
}
// Console message
2

Answer 2

Because your JSON contains multiple Images object with the same key! That is not valid and each one overwrites others (randomly probably). You should turn that json to array of objects:
[{
"imageSlider" : [{
"image" : [{
"imageId" : "1",
"imageName" : "germany1",
"imageBigName" : "germany1_BIG",
"imageRights" : "Peter"
}]},{
"image" : [{
"imageId" : "2",
"imageName" : "germany2",
"imageBigName" : "germany2_BIG",
"imageRights" : "Peter"
}]}
}]
}]
Also other keys of the CountryModel should be presented since all of them are non-optional.