I am scuffling with a SwiftUI app for iOS17 and SwiftData. I’m trying to obtain information from a JSON supply and retailer the info in SwiftData. I can obtain and decode the info right into a Swift struct, however haven’t been in a position to take action with a SwiftData @Mannequin class. The code beneath contains each the struct and SwiftData procedures. The SwiftData lessons are SDTopLevel and SDFuelStation, the structs are TopLevelX and FuelStationX. The button in FuelStationListView calls both
loadDataSD or loadDataX. The URL is right and accommodates a demo key.
struct FuelStationListView: View {
@Setting(.modelContext) var context
@Question(kind: SDFuelStation.stationName) var fuelStations: [SDFuelStation]
@State personal var sdTopLevel: SDTopLevel?
@State personal var topLevel: TopLevelX?
var physique: some View {
NavigationStack {
Button("Fetch") {
Activity {
await loadDataX()//works
//await loadDataSD()//doesn't work
}
}
Checklist {
ForEach(fuelStations) { fuelStation in
Textual content(fuelStation.stationName)
}
}
.navigationTitle("Gas Stations")
}//nav
}//physique
func loadDataSD() async {
guard let url = URL(string: "https://developer.nrel.gov/api/alt-fuel-stations/v1.json?api_key=DEMO_KEY&restrict=10") else {
print("Invalid URL")
return
}
do {
let (information, response) = strive await URLSession.shared.information(from: url)
guard (response as? HTTPURLResponse)?.statusCode == 200 else {
print(response)
return
}
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let decodedResponse = strive decoder.decode(SDTopLevel.self, from: information)
print(decodedResponse)
sdTopLevel = decodedResponse
print("sdTopLevel.fuelStations.depend is (sdTopLevel?.fuelStations.depend ?? 1000)")
} catch {
print("Invalid Knowledge")
}
}//load information
func loadDataX() async {
guard let url = URL(string: "https://developer.nrel.gov/api/alt-fuel-stations/v1.json?api_key=DEMO_KEY&restrict=10") else {
print("Invalid URL")
return
}
do {
let (information, response) = strive await URLSession.shared.information(from: url)
guard (response as? HTTPURLResponse)?.statusCode == 200 else {
print(response)
return
}
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let decodedResponse = strive decoder.decode(TopLevelX.self, from: information)
self.topLevel = decodedResponse
print("topLevel.fuelStations.depend is (topLevel?.fuelStations.depend ?? 0)")
for station in decodedResponse.fuelStations {
print(station.stationName)
}
self.topLevel = nil
} catch {
print("Invalid Knowledge")
}
}//load information
}//struct gas Station listing view
And the info:
@Mannequin
class SDFuelStation: Codable {
enum CodingKeys: CodingKey {
case id, metropolis, stationName, streetAddress
}//enum
public var id: Int
var stationName: String = ""
var streetAddress: String = ""
var metropolis: String = ""
public init(stationName: String, streetAddress: String, metropolis: String) {
self.id = 0
self.stationName = stationName
self.streetAddress = streetAddress
self.metropolis = metropolis
}
required public init(from decoder: Decoder) throws {
let container = strive decoder.container(keyedBy: CodingKeys.self)
id = strive container.decode(Int.self, forKey: .id)
stationName = strive container.decode(String.self, forKey: .stationName)
streetAddress = strive container.decode(String.self, forKey: .streetAddress)
metropolis = strive container.decode(String.self, forKey: .metropolis)
}//required init
public func encode(to encoder: Encoder) throws {
var container = encoder.container(keyedBy: CodingKeys.self)
strive container.encode(id, forKey: .id)
strive container.encode(stationName, forKey: .stationName)
strive container.encode(streetAddress, forKey: .streetAddress)
strive container.encode(metropolis, forKey: .metropolis)
}
}//class
struct TopLevelX: Codable {
let fuelStations: [FuelStationX]
}
struct FuelStationX: Codable {
let id: Int
var stationName: String = ""
var streetAddress: String = ""
var metropolis: String = ""
}//struct
The error is within the Mannequin code in a getter:
Any steerage can be appreciated. Xcode 15.0 iOS 17
