Instance method 'setValue(forKey:to:)' requires that 'TravelMode' conform to 'PersistentModel'

Question

I modified a model within my code changing a field from type Int to an enum value type ModelType.

Since doing this my app will not build! I get the message:

/var/folders/x1/pptzf9797576q9pzdzvr2qqh0000gn/T/swift-generated-sources/@__swiftmacro_7TripApp7JourneyC10travelMode18_PersistedPropertyfMa_.swift:4:23 Instance method 'setValue(forKey:to:)' requires that 'TravelMode' conform to 'PersistentModel'

What have I done wrong? I followed one of the several examples that are available.

The model is:

enum TravelMode: String, CaseIterable, Identifiable {
    case undefined, flight, car, train, hike, sail, other
    var id: Self { self }
}

@Model
class Journey: Identifiable, Hashable {
    var trip: String
    var name: String
    var date: Date
    var latitudeFrom: Double
    var longitudeFrom: Double
    var latitudeTo: Double
    var longitudeTo: Double
    var travelMode: TravelMode?
    var details: String

It is used as follows when assigning the value:

travelMode: .flight,

and its associated picker lookalike:

Picker("Travel Mode", selection: $selectedTravelMode) {
    ForEach(TravelMode.allCases) { travelMode in
        Text(travelMode.rawValue.capitalized)
    }
}

Any suggestions?

Answer 1

Your enum must conform to Codable in order for it to conform to PersistentModel

enum TravelMode: String, Codable, CaseIterable, Identifiable {
    case undefined, flight, car, train, hike, sail, other
    var id: Self { self }
}