How to read and display a dictionary from JSON? - json

Question

I am working on an app that fetches the data from JSON and displays it.
However, I am stuck with an error saying Instance method 'appendInterpolation(_:formatter:)' requires that '[String : Int]' inherit from 'NSObject'
Here is my data structure:
struct Data: Codable {
var message: String
var data: Objects
}
struct Objects: Codable {
var date: String
var day: Int
var resource: String
var stats, increase: [String: Int]
}
Function to fetch the data:
func getData() {
let urlString = "https://russianwarship.rip/api/v1/statistics/latest"
let url = URL(string: urlString)
URLSession.shared.dataTask(with: url!) { data, _, error in
if let data = data {
do {
let decoder = JSONDecoder()
let decodedData = try decoder.decode(Data.self, from: data)
self.data = decodedData
} catch {
print("Hey there's an error: \(error.localizedDescription)")
}
}
}.resume()
}
And a ContentView with the #State property to pass the placeholder data:
struct ContentView: View {
#State var data = Data(message: "", data: Objects(date: "123", day: 123, resource: "", stats: ["123" : 1], increase: ["123" : 1]))
var body: some View {
VStack {
Button("refresh") { getData() }
Text("\(data.data.date)")
Text("\(data.data.day)")
Text(data.message)
Text("\(data.data.stats)") //error is here
Here is an example of JSON response
I wonder if the problem is in data structure, because both
Text("\(data.data.date)")
Text("\(data.data.day)")
are working just fine. If there are any workarounds with this issue – please, I would highly appreciate your help!:)

Answer 1

stats is [String: Int], and so when you want to use it, you need to supply the key to get the value Int, the result is an optional that you must unwrap or supply a default value in Text
So use this:
Text("\(data.data.stats["123"] ?? 0)")
And as mentioned in the comments, do not use Data for your struct name.
EDIT-1: there are two ways you can make the struct fields camelCase; one is using the CodingKeys as shown in ItemModel, or at the decoding stage, as shown in the getData() function. Note, I've also updated your models to make them easier to use.
struct DataModel: Codable {
var message: String
var data: ObjectModel
}
struct ObjectModel: Codable {
var date: String
var day: Int
var resource: String
var stats: ItemModel
var increase: ItemModel
}
struct ItemModel: Codable {
var personnelUnits: Int
var tanks: Int
var armouredFightingVehicles: Int
// ...
// manual CodingKeys
// enum CodingKeys: String, CodingKey {
// case tanks
// case personnelUnits = "personnel_units"
// case armouredFightingVehicles = "armoured_fighting_vehicles"
// }
}
struct ContentView: View {
#State var dataModel = DataModel(message: "", data: ObjectModel(date: "123", day: 123, resource: "", stats: ItemModel(personnelUnits: 123, tanks: 456, armouredFightingVehicles: 789), increase: ItemModel(personnelUnits: 3, tanks: 4, armouredFightingVehicles: 5)))
var body: some View {
VStack {
Button("get data from Server") { getData() }
Text("\(dataModel.data.date)")
Text("\(dataModel.data.day)")
Text(dataModel.message)
Text("\(dataModel.data.stats.armouredFightingVehicles)") // <-- here
}
}
func getData() {
let urlString = "https://russianwarship.rip/api/v1/statistics/latest"
if let url = URL(string: urlString) {
URLSession.shared.dataTask(with: url) { data, _, error in
if let data = data {
do {
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase // <-- here
dataModel = try decoder.decode(DataModel.self, from: data)
} catch {
print("--> error: \(error)")
}
}
}.resume()
}
}
}