Problem The following code doesn't work: let predicate = #Predicate<Car> { car in car.size == size //This doesn't work } Console Error Query encountered an error: SwiftData.SwiftDataError(_error: SwiftData.SwiftDataError._Error.unsupportedPredicate) Root cause Size is an enum, #Predicate works with other type such as String however doesn't work with enum Enum value is saved however is not filtered by #Predicate Environment Xcode: 15.0 (15A240d) - App Store macOS: 14.0 (23A339) - Release Candidate Steps to reproduce Run the app on iOS 17 or macOS Sonoma Press the Add button Notice that the list remains empty Expected behaviour List should show the newly created small car Actual behaviour List remains empty inspite of successfully creating the small car. Feedback FB13194334 Code Size enum Size: String, Codable { case small case medium case large } Car import SwiftData @Model class Car { let id: UUID let name: String let size: Size init( id: UUID, name: String, size: Size ) { self.id = id self.name = name self.size = size } } ContentView struct ContentView: View { var body: some View { NavigationStack { CarList(size: .small) } } CarList import SwiftUI import SwiftData struct CarList: View { let size: Size @Environment(\.modelContext) private var modelContext @Query private var cars: [Car] init(size: Size) { self.size = size let predicate = #Predicate<Car> { car in car.size == size //This doesn't work } _cars = Query(filter: predicate, sort: \.name) } var body: some View { List(cars) { car in VStack(alignment: .leading) { Text(car.name) Text("\(car.size.rawValue)") Text(car.id.uuidString) .font(.footnote) } } .toolbar { Button("Add") { createCar() } } } private func createCar() { let name = "aaa" let car = Car( id: UUID(), name: name, size: size ) modelContext.insert(car) } }

I've been testing out SwiftData but haven't bee able to get ModelContext notifications working. I've tried both an objc observer and for await patterns but it never fires. If I listen for the older nsmanagedcontext notifications they are firing, but I am hoping that the new ones give an ID instead of an objectId. Has anyone got these working? Attempt 1: class NotificationObserver { init() { let didSaveNotification = ModelContext.didSave NotificationCenter.default.addObserver(self, selector: #selector(didSave(_:)), name: didSaveNotification, object: nil) } @objc func didSave(_ notification: Notification) { print(notification.name) } } Attempt 2: class NotificationObserver { init() { let didSaveNotification = ModelContext.didSave Task { for await note in NotificationCenter.default.notifications(named: didSaveNotification) { print(note) } } } }