How to persist custom enum with SwiftData?

I want to save a custom enum to my SwiftData model. I can get it to work that it shows and even updates the value in the UI. Though, the change of the enum var/entity isn’t persisted when relaunching the app!

Any advice what to watch out for when using custom enums?

My Model

enum Type: Int, Codable {
    case foo = 0
    case bar = 1
}

@Model
final public class Item {
    var type: Type
}

UI Code

struct DetailView: View {
    @Bindable var item: Item
    
    // MARK: -
    var body: some View {
        Picker("Type", selection: $item.type) {
            Text("Foo").tag(Type.foo)
            Text("Bar").tag(Type.bar)
        }
        .pickerStyle(.segmented)
    }
}

This solution work for me. Hopefully enums will be fixed in future versions of SwiftData.

enum SomeType: Int, Codable {
    case foo = 0
    case bar = 1
}

@Model
final public class Item {
    
    @Transient var type: SomeType {
        get { SomeType(rawValue: _type)! }
        set { _type = newValue.rawValue }
    }
    
    @Attribute var _type: SomeType.RawValue
    
} 

The issue has been fixed since iOS version 17 beta 7. Now the code below works correctly. Release notes

enum ItemType: Int, Codable {
    case foo = 0
    case bar = 1
}

@Model
final public class Item {
    
    var type: ItemType
    
    init(type: ItemType) {
        self.type = type
    }
    
}

struct DetailView: View {
    
    @Bindable var item: Item
    
    var body: some View {
        Picker("Type", selection: $item.type) {
            Text("Foo").tag(ItemType.foo)
            Text("Bar").tag(ItemType.bar)
        }
        .pickerStyle(.segmented)
    }
    
}

Are you witnessing the same issue with the enum placed inside of the class?

@Model
final public class Item {
    var type: ItemType

    enum ItemType: Int, Codable {
        case foo, bar
    }

    init(type: ItemType) {
        self.type = type
    }
}