I have a very simple CoreData model that has 1 entity and 2 attributes. This code works fine: .onChange(of: searchText) { _, text in evnts.nsPredicate = text.isEmpty ? nil :NSPredicate(format: "eventName CONTAINS %@ " , text ) but I'd like to also search with the same text string for my second attribute (which is a Date). I believe an OR is appropriate for two conditions (find either one). See attempted code below: evnts.nsPredicate = text.isEmpty ? nil : NSPredicate(format: "(eventName CONTAINS %@) OR (dueDate CONTAINS %i) " , text ) This crashes immediately %@ does the same. Is there a way to accomplish this? How is SwiftUI not an option below?

Hi, Not sure how to describe my issue best: I am using SwiftData and CloudKit to store my data. In the past, when I tested my app on different devices, the data would sync between the devices automatically. For whatever reason this has stopped now and the data no longer syncs. No matter what I do, it feels as if all the data is actually stored just locally on each device. How can I check if the data is actually stored in the cloud and what could be reasons, why its no longer synching between my devices (and yes, I am logged in with the same Apple ID on all devices). Thanks for any hint! Max

I'm trying to convert some data, then save it back to Core Data. Sometimes this works fine without an issue, but occasionally I'll get an error Thread 1: EXC_BAD_ACCESS (code=1, address=0x0) It seems to occur when saving the core data context. I'm having trouble trying to debug it as it doesn't happen on the same object each time and can't reliably recreate the error Full view code can be found https://pastebin.com/d974V5Si but main functions below var body: some View { VStack { // Visual code here } .onAppear() { DispatchQueue.global(qos: .background).async { while (getHowManyProjectsToUpdate() > 0) { leftToUpdate = getHowManyProjectsToUpdate() updateLocal() } if getHowManyProjectsToUpdate() == 0 { while (getNumberOfFilesInDocumentsDirectory() > 0) { deleteImagesFromDocumentsDirectory() } if getNumberOfFilesInDocumentsDirectory() == 0 { DispatchQueue.main.asyncAfter(deadline: .now()) { withAnimation { self.isActive = true } } } } } } } update local function func updateLocal() { autoreleasepool { let fetchRequest: NSFetchRequest<Project> = Project.fetchRequest() fetchRequest.predicate = NSPredicate(format: "converted = %d", false) fetchRequest.fetchLimit = 1 fetchRequest.sortDescriptors = [NSSortDescriptor(keyPath: \Project.name, ascending: true), NSSortDescriptor(keyPath: \Project.name, ascending: true)] do { let projects = try viewContext.fetch(fetchRequest) for project in projects { currentPicNumber = 0 currentProjectName = project.name ?? "Error loading project" if let projectMain = project.mainPicture { currentProjectImage = getUIImage(picture: projectMain) } if let pictures = project.pictures { projectPicNumber = pictures.count // Get main image if let projectMain = project.mainPicture { if let imgThumbData = convertImageThumb(picture: projectMain) { project.mainPictureData = imgThumbData } } while (getTotalImagesToConvertForProject(project: project ) > 0) { convertImageBatch(project: project) } project.converted = true saveContext() viewContext.refreshAllObjects() } } } catch { print("Fetch Failed") } } } convertImageBatch function func convertImageBatch(project: Project) { autoreleasepool { let fetchRequestPic: NSFetchRequest<Picture> = Picture.fetchRequest() let projectPredicate = NSPredicate(format: "project = %@", project) let dataPredicate = NSPredicate(format: "pictureData == NULL") fetchRequestPic.predicate = NSCompoundPredicate(andPredicateWithSubpredicates: [projectPredicate, dataPredicate]) fetchRequestPic.fetchLimit = 5 fetchRequestPic.sortDescriptors = [NSSortDescriptor(keyPath: \Picture.dateTaken, ascending: true)] do { let pictures = try viewContext.fetch(fetchRequestPic) for picture in pictures { currentPicNumber = currentPicNumber + 1 if let imgData = convertImage(picture: picture), let imgThumbData = convertImageThumb(picture: picture) { // Save Converted picture.pictureData = imgData picture.pictureThumbnailData = imgThumbData // Save Image saveContext() viewContext.refreshAllObjects() } else { viewContext.delete(picture) saveContext() viewContext.refreshAllObjects() } } } catch { print("Fetch Failed") } } } And finally saving func saveContext() { do { try viewContext.save() } catch { let nsError = error as NSError fatalError("Unresolved error \(nsError), \(nsError.userInfo)") } }

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) } }

Hey there, I’m feeling pretty desperate at this point, as my most recent update to Xcode 16.1 and the new 18.1 simulators has basically made it impossible for me to work on my apps. The same app and same code run fine in the 18.0 simulators with the same iCloud account logged in. I’ve tried multiple simulators with the same results, even on different computers. I’ve also tried logging in repeatedly without any luck. The CloudKit database logs don’t show any errors or suspicious entries. Reinstalling the app on the simulator doesn't help either. Whenever I launch the application in Xcode, I'm getting: error: CoreData+CloudKit: -[NSCloudKitMirroringDelegate _performSetupRequest:]_block_invoke(1240): <NSCloudKitMirroringDelegate: 0x600003d213b0>: Failed to set up CloudKit integration for store: <NSSQLCore: 0x103f124e0> (URL: file:///Users/kerstenbroich/Library/Developer/CoreSimulator/Devices/57BC78CE-DB2A-4AC0-9D7A-43C386305F56/data/Containers/Data/Application/EFDE9B05-0584-47C5-80AE-F2FF5994860C/Library/Application%20Support/Model.sqlite) <CKError 0x600000d3dfe0: "Partial Failure" (2/1011); "Failed to modify some record zones"; partial errors: { com.apple.coredata.cloudkit.zone:__defaultOwner__ = <CKError 0x600000d7c090: "Internal Error" (1/5000); "Failed user key sync"> }> error: CoreData+CloudKit: -[NSCloudKitMirroringDelegate recoverFromError:](2310): <NSCloudKitMirroringDelegate: 0x600003d213b0> - Attempting recovery from error: <CKError 0x600000d3dfe0: "Partial Failure" (2/1011); "Failed to modify some record zones"; partial errors: { com.apple.coredata.cloudkit.zone:__defaultOwner__ = <CKError 0x600000d7c090: "Internal Error" (1/5000); "Failed user key sync"> }> error: CoreData+CloudKit: -[NSCloudKitMirroringDelegate _recoverFromPartialError:forStore:inMonitor:]_block_invoke(2773): <NSCloudKitMirroringDelegate: 0x600003d213b0>: Found unknown error as part of a partial failure: <CKError 0x600000d7c090: "Internal Error" (1/5000); "Failed user key sync"> error: CoreData+CloudKit: -[NSCloudKitMirroringDelegate _recoverFromPartialError:forStore:inMonitor:](2820): <NSCloudKitMirroringDelegate: 0x600003d213b0>: Error recovery failed because the following fatal errors were found: { "<CKRecordZoneID: 0x600000d62340; zoneName=com.apple.coredata.cloudkit.zone, ownerName=__defaultOwner__>" = "<CKError 0x600000d7c090: \"Internal Error\" (1/5000); \"Failed user key sync\">"; } Any help/ideas would be much appreciated, because I have no clue what to try next. Thanks a lot!

Hey, For some reason I see crashes for my iOS app related to CloudKit entitlements. The crash happens on start up and it says: "CKException - Application has malformed entitlements. Found value "*" for entitlement com.apple.developer.icloud-services, expected an array of strings" I have checked my entitlements of the same build on App Store Connect and it shows "com.apple.developer.icloud-services: ( "CloudKit" )" So I am not sure why users are having this issue. I haven't been able to reproduce it. Does anyone have any idea why this is happening? Thanks

The 'unique' attribute is a really nice feature, BUT. In some of my apps, the unique identifier for an object is a combination of multiple attributes. (Example: a book title is not unique, but a combination of book title and author list is.) How do I model this with SwiftData? I cannot use @Attribute(.unique) on either the title OR the author list, but I want SwiftData to provide the same "insert or update" logic. Is this possible?

Hi all, In my SwiftUI / SwiftData / Cloudkit app which is a series of lists, I have a model object called Project which contains an array of model objects called subprojects: final class Project1 { var name: String = "" @Relationship(deleteRule: .cascade, inverse: \Subproject.project) var subprojects : [Subproject]? init(name: String) { self.name = name self.subprojects = [] } } The user will select a project from a list, which will generate a list of subprojects in another list, and if they select a subproject, it will generate a list categories and if the user selects a category it will generate another list of child objects owned by category and on and on. This is the pattern in my app, I'm constantly passing arrays of model objects that are the children of other model objects throughout the program, and I need the user to be able to add and remove things from them. My initial approach was to pass these arrays as bindings so that I'd be able to mutate them. This worked for the most part but there were two problems: it was a lot of custom binding code and when I had to unwrap these bindings using init?(_ base: Binding<Value?>), my program would crash if one of these arrays became nil (it's some weird quirk of that init that I don't understand at al). As I'm still learning the framework, I had not realized that the @model macro had automatically made my model objects observable, so I decided to remove the bindings and simply pass the arrays by reference, and while it seems these references will carry the most up to date version of the array, you cannot mutate them unless you have access to the parent and mutate it like such: project.subcategories?.removeAll { $0 == subcategory } project.subcategories?.append(subcategory) This is weirding me out because you can't unwrap subcategories before you try to mutate the array, it has to be done like above. In my code, I like to unwrap all optionals at the moment that I need the values stored in them and if not, I like to post an error to the user. Isn't that the point of optionals? So I don't understand why it's like this and ultimately am wondering if I'm using the correct design pattern for what I'm trying to accomplish or if I'm missing something? Any input would be much appreciated! Also, I do have a small MRE project if the explanation above wasn't clear enough, but I was unable to paste in here (too long), attach the zip or paste a link to Google Drive. Open to sharing it if anyone can tell me the best way to do so. Thanks!

Hey there, Can we bundle our app with our own version of SQLite with extensions that we want. From what I've seen, we aren't allowed to add extensions to the built in IOS SQLite, so would this be the only way to use extensions. I ask this because I want to use the spell fix extension. I couldn't find a lot of people talking about adding SQLite extensions. Thank you!

Hi Folks, starting with iOS18 and using Xcode16, accessing fetchedProperties results in an error. I identified the issue to occur as soon as the initialization of a fetched property with external binary data storage starts. Console output during debugging: *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'This expression has evaluation disabled' *** First throw call stack: [...] libc++abi: terminating due to uncaught exception of type NSException Console output when trying to "print" the item via the contact menu of the debugger: Printing description of variable: error: error: Execution was interrupted, reason: internal ObjC exception breakpoint(-6).. The process has been returned to the state before expression evaluation. Message from debugger: killed The identical code works with iOS before iOS 18 (same for iPadOS 18). Does anyone observed a similar issue and figured out a solution already? Cheers, folox

Some of my customer get the following CloudKit error (I cannot reproduce is myself). Failed to modify some records (CKErrorDomain:2) userInfo: CKErrorDescription:Failed to modify some records CKPartialErrors:{ "<CKRecordID: ooo; recordName=ooo, zoneID=ooo:__defaultOwner__>" = "<CKError 0x600003809ce0: \"Limit Exceeded\" (27/2023); server message = \"AssetUploadTokenRetrieveRequest request size exceeds limit\"; op = ooo; uuid = ooo; container ID = \"ooo\">" This is a CKError.limitExeeded error. I create 200 or less records in a batch operation. So I am below the 400 limit. Searching the Internet for "AssetUploadTokenRetrieveRequest request size exceeds limit": 0 results Can anyone give me a hint?

I'm experiencing a persistent issue with CloudKit sharing in my iOS application. When attempting to present a UICloudSharingController, I receive the error message "Unknown client: ChoreOrganizer" in the console. App Configuration Details: App Name: ChoreOrganizer Bundle ID: com.ProgressByBits.ChoreOrganizer CloudKit Container ID: iCloud.com.ProgressByBits.ChoreOrganizer Core Data Model Name: ChoreOrganizer.xcdatamodeld Core Data Entity: Chore Error Details: The error "Unknown client: ChoreOrganizer" occurs when I present the UICloudSharingController This happens only on the first attempt to share; subsequent attempts during the same app session don't show the error but sharing still doesn't work All my code executes successfully without errors until UICloudSharingController is presented Implementation Details: I'm using NSPersistentCloudKitContainer for Core Data synchronization and UICloudSharingController for sharing. My implementation creates a custom CloudKit zone, saves both a record and a CKShare in that zone, and then presents the sharing controller. Here's the relevant code: @MainActor func presentSharing(from viewController: UIViewController) async throws { // Create CloudKit container let container = CKContainer(identifier: containerIdentifier) let database = container.privateCloudDatabase // Define custom zone ID let zoneID = CKRecordZone.ID(zoneName: "SharedChores", ownerName: CKCurrentUserDefaultName) do { // Check if zone exists, create if necessary do { _ = try await database.recordZone(for: zoneID) } catch { let newZone = CKRecordZone(zoneID: zoneID) _ = try await database.save(newZone) } // Create record in custom zone let recordID = CKRecord.ID(recordName: "SharedChoresRoot", zoneID: zoneID) let rootRecord = CKRecord(recordType: "ChoreRoot", recordID: recordID) rootRecord["name"] = "Shared Chores Root" as CKRecordValue // Create share let share = CKShare(rootRecord: rootRecord) share[CKShare.SystemFieldKey.title] = "Shared Tasks" as CKRecordValue // Save both record and share in same operation let recordsToSave: [CKRecord] = [rootRecord, share] _ = try await database.modifyRecords(saving: recordsToSave, deleting: []) // Present sharing controller let sharingController = UICloudSharingController(share: share, container: container) sharingController.delegate = shareDelegate // Configure popover if let popover = sharingController.popoverPresentationController { popover.sourceView = viewController.view popover.sourceRect = CGRect( x: viewController.view.bounds.midX, y: viewController.view.bounds.midY, width: 1, height: 1 ) popover.permittedArrowDirections = [] } viewController.present(sharingController, animated: true) } catch { throw error } } Steps I've already tried: Verified correct bundle ID and container ID match in all places (code, entitlements file, Developer Portal) Added NSUbiquitousContainers configuration to Info.plist Ensured proper entitlements in the app Created and configured proper provisioning profiles Tried both default zone and custom zone for sharing Various ways of saving the record and share (separate operations, same operation) Cleaned build folder, deleted derived data, reinstalled the app Tried on both simulator and physical device Confirmed CloudKit container exists in CloudKit Dashboard with correct schema Verified iCloud is properly signed in on test devices Console Output: 1. Starting sharing process 2. Created CKContainer with ID: iCloud.com.ProgressByBits.ChoreOrganizer 3. Using zone: SharedChores 4. Checking if zone exists 5. Zone exists 7. Created record with ID: <CKRecordID: 0x3033ebd80; recordName=SharedChoresRoot, zoneID=SharedChores:__defaultOwner__> 8. Created share with ID: <CKRecordID: 0x3033ea920; recordName=Share-C4701F43-7591-4436-BBF4-6FA8AF3DF532, zoneID=SharedChores:__defaultOwner__> 9. About to save record and share 10. Records saved successfully 11. Creating UICloudSharingController 12. About to present UICloudSharingController 13. UICloudSharingController presented Unknown client: ChoreOrganizer Additional Information: When accessing the CloudKit Dashboard, I can see that data is being properly synced to the cloud, indicating that the basic CloudKit integration is working. The issue appears to be specific to the sharing functionality. I would greatly appreciate any insights or solutions to resolve this persistent "Unknown client" error. Thank you for your assistance.

I have a UIKit app where I've adopted SwiftData and I'm struggling with a crash coming in from some of my users. I'm not able to reproduce it myself and as it only happens to a small fraction of my user base, it seems like a race condition of some sort. This is the assertion message: SwiftData/DefaultStore.swift:453: Fatal error: API Contract Violation: Editors must register their identifiers before invoking operations on this store SwiftData.DefaultStore: 00CF060A-291A-4E79-BEC3-E6A6B20F345E did not. (ID is unique per crash) This is the ModelActor that crashes: @available(iOS 17, *) @ModelActor actor ConsumptionDatabaseStorage: ConsumptionSessionStorage { struct Error: LocalizedError { var errorDescription: String? } private let sortDescriptor = [SortDescriptor(\SDConsumptionSession.startTimeUtc, order: .reverse)] static func createStorage(userId: String) throws -> ConsumptionDatabaseStorage { guard let appGroupContainer = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: UserDefaults.defaultAppGroupIdentifier) else { throw Error(errorDescription: "Invalid app group container ID") } func createModelContainer(databaseUrl: URL) throws -> ModelContainer { return try ModelContainer(for: SDConsumptionSession.self, SDPriceSegment.self, configurations: ModelConfiguration(url: databaseUrl)) } let databaseUrl = appGroupContainer.appendingPathComponent("\(userId).sqlite") do { return self.init(modelContainer: try createModelContainer(databaseUrl: databaseUrl)) } catch { // Creating the model storage failed. Remove the database file and try again. try? FileManager.default.removeItem(at: databaseUrl) return self.init(modelContainer: try createModelContainer(databaseUrl: databaseUrl)) } } func isStorageEmpty() async -> Bool { (try? self.modelContext.fetchCount(FetchDescriptor<SDConsumptionSession>())) ?? 0 == 0 // <-- Crash here! } func sessionsIn(interval: DateInterval) async throws -> [ConsumptionSession] { let fetchDescriptor = FetchDescriptor(predicate: #Predicate<SDConsumptionSession> { sdSession in if let startDate = sdSession.startTimeUtc { return interval.start <= startDate && interval.end > startDate } else { return false } }, sortBy: self.sortDescriptor) let consumptionSessions = try self.modelContext.fetch(fetchDescriptor) // <-- Crash here! return consumptionSessions.map { ConsumptionSession(swiftDataSession: $0) } } func updateSessions(sessions: [ConsumptionSession]) async throws { if #unavailable(iOS 18) { // Price segments are duplicated if re-inserted so unfortunately we have to delete and reinsert sessions. // On iOS 18, this is enforced by the #Unique macro on SDPriceSegment. let sessionIds = Set(sessions.map(\.id)) try self.modelContext.delete(model: SDConsumptionSession.self, where: #Predicate<SDConsumptionSession> { sessionIds.contains($0.id) }) } for session in sessions { self.modelContext.insert(SDConsumptionSession(consumptionSession: session)) } if self.modelContext.hasChanges { try self.modelContext.save() } } func deleteAllSessions() async { if #available(iOS 18, *) { try? self.modelContainer.erase() } else { self.modelContainer.deleteAllData() } } } The actor conforms to this protocol: protocol ConsumptionSessionStorage { func isStorageEmpty() async -> Bool func hasCreditCardSessions() async -> Bool func sessionsIn(interval: DateInterval) async throws -> [ConsumptionSession] func updateSessions(sessions: [ConsumptionSession]) async throws func deleteAllSessions() async } The crash is coming in from line 30 and 41, in other words, when trying to fetch data from the database. There doesn't seem to be any common trait for the crashes. They occur across iOS versions and device types. Any idea what might cause this?

Hi all, Has anyone stumbled upon the SwiftData equivalent of @SectionedFetchRequest? Is there a way to do it with @Query? I'll keep going through the documentation but if anyone has an answer, it would be much appreciated!! Thank you.

I have a simple model that contains a one-to-many relationship to itself to represent a simple tree structure. It is set to cascade deletes so deleting the parent node deletes the children. Unfortunately I get an error when I try to batch delete. A test demonstrates: @Model final class TreeNode { var parent: TreeNode? @Relationship(deleteRule: .cascade, inverse: \TreeNode.parent) var children: [TreeNode] = [] init(parent: TreeNode? = nil) { self.parent = parent } } func testBatchDelete() throws { let config = ModelConfiguration(isStoredInMemoryOnly: true) let container = try ModelContainer(for: TreeNode.self, configurations: config) let context = ModelContext(container) context.autosaveEnabled = false let root = TreeNode() context.insert(root) for _ in 0..<10 { let child = TreeNode(parent: root) context.insert(child) } try context.save() // fails if first item doesn't have a nil parent, succeeds otherwise // which row is first is random, so will succeed sometimes try context.delete(model: TreeNode.self) } The error raised is: CoreData: error: Unhandled opt lock error from executeBatchDeleteRequest Constraint trigger violation: Batch delete failed due to mandatory OTO nullify inverse on TreeNode/parent and userInfo { NSExceptionOmitCallstacks = 1; NSLocalizedFailureReason = "Constraint trigger violation: Batch delete failed due to mandatory OTO nullify inverse on TreeNode/parent"; "_NSCoreDataOptimisticLockingFailureConflictsKey" = ( ); } Interestingly, if the first record when doing an unsorted query happens to be the parent node, it works correctly, so the above unit test will actually work sometimes. Now, this can be "solved" by changing the reverse relationship to an optional like so: @Relationship(deleteRule: .cascade, inverse: \TreeNode.parent) var children: [TreeNode]? The above delete will work fine. However, this causes issues with predicates that test counts in children, like for instance deleting only nodes where children is empty for example: try context.delete(model: TreeNode.self, where: #Predicate { $0.children?.isEmpty ?? true }) It ends up crashing and dumps a stacktrace to the console with: An uncaught exception was raised Keypath containing KVC aggregate where there shouldn't be one; failed to handle children.@count (the stacktrace is quite long and deep in CoreData's NSSQLGenerator) Does anyone know how to work around this?

How does SwiftData work with background operations? CoreData had background context that could be used to avoid UI hang for heavy operations. Is there an equivalent in SwiftData, and if so, do I have to merge changes or does it save directly to persistent store?

I'm getting the following error message when executing the rollback method in a modelContext, what could be causing this ? SwiftData/ModelSnapshot.swift:46: Fatal error: A ModelSnapshot must be initialized with a known-keys dictionary

I have integrated CloudKit into a CoreData application and am ready to deploy the schema to production but keep getting an "internal error" when trying to deploy to production or reset my CloudKit environment. I have attached images of what I am seeing including one of the console error. Is there any way to resolve this?

Hi, I have designed an app which needs to reschedule notifications according to the user's calendar at midnight. The function has been implemented successfully via backgroundtask. But since the app has enabled iCloud sync, some users will edit their calendar on their iPad and expect that the notifications will be sent promptly to them on iPhone without launching the app on their iPhone. But the problem is that if they haven't launched the app on their iPhone, iCloud sync won't happen. The notifications on their iPhone haven't been updated and will be sent wrongly. How can I design some codes to let iCloud sync across the devices without launching the app at midnight and then reschedule notifications?

This simple test fails in my project. Similar code in my application also crashes. How do I debug the problem? What project settings are required. I have added SwiftData as a framework to test (and application) targets? Thanks, The problem is with: modelContext.insert(item) Thread 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) import XCTest import SwiftData @Model class FakeModel { var name: String init(name: String) { self.name = name } } @MainActor final class FakeModelTests: XCTestCase { var modelContext: ModelContext! override func setUp() { super.setUp() do { let container = try ModelContainer(for: FakeModel.self, configurations: ModelConfiguration(isStoredInMemoryOnly: true)) modelContext = container.mainContext } catch { XCTFail("Failed to create ModelContainer: \(error)") modelContext = nil } } func testSaveFetchDeleteFakeItem() { guard let modelContext = modelContext else { XCTFail("ModelContext must be initialized") return } let item = FakeModel(name: "Test") modelContext.insert(item) let fetchDescriptor = FetchDescriptor<FakeModel>() let items = try! modelContext.fetch(fetchDescriptor) XCTAssertEqual(items.count, 1) XCTAssertEqual(items.first?.name, "Test") modelContext.delete(item) let itemsAfterDelete = try! modelContext.fetch(fetchDescriptor) XCTAssertEqual(itemsAfterDelete.count, 0) } }