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Hello,I am observing the following error message in the console window of Xcode when running my app (on iOS).CoreData: error: API Misuse: Attempt to serialize store access on non-owning coordinator (PSC = 0x174262940, store PSC = 0x0)I can't seem to pin down the specific operations that are causing it. It almost seems like it is something that Core Data is emitting at some point after whatever the offending operation is. The Core Data setup in the app is done using a UIManagedDocument and in addition I am adding some private queue concurrency contexts where the parent is the managed context in the document (which is the main). Auto save of the UIManagedDocument is turned on. In addition at certain points the app is also doing explicit save of these private contexts. I don't see any ill affects due to the message but I would like to get to the bottom of the issue. I did do searching and there was an old posting where someone fixed it by saving their managed context before using a fetched results controller it was associated with. This seems wrong to me as having to a do a save before using the fetched results controller might catch updates to the managed objects that are in the middle of being made and aren't ready for saving yet because a save could end up violating a relationship constraint.Someone also suggested to make sure the entities were being created with NSEntityDescription.insertNewObject which I double checked that they are.I have -com.apple.CoreData.ConcurrencyDebug set to 1 and when there were other concrrency issues it helped. However with this particular situation it just emits the message and continues. Is there a way to get Core Data to break in the debugger for his message? Any ideas on how I might get to the bottom of this issue or settings I can enabled are greatly appreciated.Thanks Robert
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I have implemented NSCoreDataCoreSpotlightDelegate, and I missed out the part where the default expirationDate is 1 month, now items that I have added 3 months ago are not showing up in the search index.How do I get NSCoreDataCoreSpotlightDelegate to reindex all the items?I used to be able to call this:mcdcsd.searchableIndex(CSSearchableIndex.default(), reindexAllSearchableItemsWithAcknowledgementHandler: {})And the first time, it will reindex all the items, but if I re-run the app with the above line uncommented again, it will not reindex.If I uninstall the app, install back, then uncomment the above line, then it will index all again for the first time.How do I get it to reindex everything again?
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There are a few things about how Core Data 4 Cloud Kit initializes that I'm stuggling to understand. I've spent most of the day finally getting a schema initialized on the server, and learnt a few things along the way.Firstly, even though I have a Default configuration in my managed object model, and it has been there from day one with the option "Used with CloudKit" checked for true, if I create an `NSPersistentStoreDescription` and set the configuration property to "Default", when I try to load the stores, it will fail, saying "Unable to find a configuration named 'Default' in the specified managed object model.". If I inpsect the debug description for my ManagedObjectModel instance, it does indeed not have any reference to the string "Default" in it (I'm not sure if debugDescription is actually printing out the configuration names however). Why does this fail? I can only get my store loaded and the schema initialized if I remove the code that sets the configuration name to "Default".The next thing that tripped me up was the NSPersistentCloudKitContainerOptions property on the store description. Considering that the only property on that class is now gone, so you no longer need to perform `options.shouldInitializeSchema = true`, I incorrectly assumed that I'd no longer need to even create and set a NSPersistentCloudKitContainerOptions instance on my store description, because all it really holds is the containerIdentifier. Why would I need to specify a container identifier if the system is going to fetch the first iCloud Container Identifier out of the entitlements file and associate it with the Default configuration which I'd (clearly incorrectly) assumed would be automatically associated with CloudKit and my "Default" entitlement container identifier.Below is the code I was using. It's mild playground refactor of my real code, but it's quite straightforward.// Instantiate the Managed Object Model
let modelName = "CloudModel"
let url = Bundle.main.url(forResource: modelName, withExtension: "momd")
let mom: NSManagedObjectModel = NSManagedObjectModel(contentsOf: url!)!
// Define the Cloud Store Description
let storeURL = URL(fileURLWithPath: "Cloud.sqlite",
isDirectory: false,
relativeTo: NSPersistentContainer.defaultDirectoryURL())
let cloudStoreDescription = NSPersistentStoreDescription(url: storeURL)
cloudStoreDescription.shouldAddStoreAsynchronously = true
cloudStoreDescription.configuration = "Default" // this will cause loading to fail with an "Unable to find
// a configuration named 'Default' in the specified managed object model." error
// Add a container options instance to the description, because without it, loading will fail with
// "Couldn't initialize CloudKit schema because no stores in the coordinator are configured to use CloudKit"
var cloudKitOptions = NSPersistentCloudKitContainerOptions(containerIdentifier: "com.example.container.identifier")
cloudStoreDescription.cloudKitContainerOptions = cloudKitOptions
// Create the Container for the Cloud Store
let container: NSPersistentCloudKitContainer = NSPersistentCloudKitContainer(name: modelName, managedObjectModel: mom)
container.persistentStoreDescriptions = [cloudStoreDescription]
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So I've been developing happily with CoreData+CloudKit for a while now, and really haven't run into any issues until this. I've migrated my model a couple of times, and it worked fine, but this was the first time I added a new entity to the model. If I run on a device (any device, iPhone, iPad, Mac via Catalyst), I get a migration error. Here's the entirety of my persistentContainer setup: public var persistentContainer: NSPersistentContainer = {
let modelPath = Bundle(for: CoreDataStack.self).url(forResource: "Progress", withExtension: "momd")!
let model = NSManagedObjectModel(contentsOf: modelPath)!
let container = NSPersistentCloudKitContainer(name: "Progress", managedObjectModel: model)
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {
print(storeDescription)
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
return container
}()And here's the error I'm getting:Callstacks=true}}}CoreData: annotation: : Attempting recovery from error encountered during addPersistentStore: Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration." UserInfo={sourceURL=[…].sqlite, reason=Cannot migrate store in-place: constraint violation during attempted migration, destinationURL=[…].sqlite, NSUnderlyingError=0x600000cebae0 {Error Domain=NSCocoaErrorDomain Code=134111 "(null)" UserInfo={_NSCoreDataOptimisticLockingFailureConflictsKey=(
), NSUnderlyingException=Constraint unique violation, reason=constraint violation during attempted migration, NSExceptionOmitCallstacks=true}}}Important note: I am not using contraints at all in this model. I have created a new Entity, given it a single attribute, and a single one-to-many relationship with an existing entity. That's all.Also, here's an excerpt from the logs when I have -com.apple.CoreData.MigrationDebug enabled, pointing to an issue with the CloudKit metadata tables update step:CoreData: annotation: Completed persistent history metadata tables update
CoreData: annotation: Beginning CloudKit metadata tables update
CoreData: annotation: Failed lightweight migration on connection
CoreData: annotation: Rolling back formal transactionAnyone seen this, have any idea what could be failing, or how to make cloudkit/coredata happy with a migration like this?
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Any insights on how to incorporate CloudKit (or CoreData) in the WidgetKit extension? Where in the WidgetKit api do I make the asynchronous call to load the data to be available for the TimelineProvider?
On iOS 13 I used to use optional @State properties to adapt views. In my case, the presented view would either create a new object (an assignment) if the state that is passed into it is nil, or edit the assignment if an assignment was passed in. This would be done in the action block of a Button and it worked beautifully.
On iOS 14 / Xcode 12 this no longer seems to work. Given the following code which creates a new assignment and passes it into the editor view when the user taps a "New Assignment" button, the value of assignment remains nil. Is anyone else experiencing similar behaviour?
struct ContentView: View {
		@Environment(\.managedObjectContext) var context
		@State var assignmentEditorIsPresented = false
		@State var assignment: Assignment? = nil
		var Body: some View {
				[...]
				Button("New Assignment", action: {
						self.assignment = Assignment(context: context)
						self.assignmentEditorIsPresented = true
				})
				.sheet(isPresented: assignmentEditorIsPresented) {
						[...]
				}
		}
}
What's even weirder is that I tried adding a random piece of state, an Int, to this view and modifying it right before the assignment state (between lines 9 and 10) and it didn't change either.
Post not yet marked as solved
I use NSPersistentCloudKitContainer. It seems that it the data synced in iCloud after a few seconds. However, I get the following warnings in the console. I do not understand what is it for.
CoreData: warning: CoreData+CloudKit: -[NSCloudKitMirroringDelegate _performSetupRequest:]_block_invoke(813): <NSCloudKitMirroringDelegate: 0x280b051e0>: Successfully set up CloudKit integration for store: <NSSQLCore: 0x280024a00> (URL: file:///private/var/mobile/Containers/Shared/AppGroup/89D9D17C-03DF-48E4-83C3-DB23A8FE0D6F/TestData.sqlite)
CoreData: warning: CoreData+CloudKit: -[NSCloudKitMirroringDelegate checkAndScheduleImportIfNecessary:]_block_invoke(2033): <NSCloudKitMirroringDelegate: 0x280b051e0>: Scheduling automated import with activity: <CKSchedulerActivity: 0x281f51590; additionalXPCActivityCriteria={
Priority = Utility;
}, containerID=<CKContainerID: 0x283c612e0; containerIdentifier=iCloud.io.test.testData, containerEnvironment="Sandbox">, identifier=com.apple.coredata.cloudkit.activity.import, priority=2>
Could you please explain what is this warning for and what should I do to fix it?
Post not yet marked as solved
I used a renaming identifier to rename an Entity Name, but it doesn't seem to work and it causes a crash at start during in-place migration.
How to rename an Entity Name when using NSPersistentCloudKitContainer?
I get this exception at start:
CloudKit integration forbids renaming 'OldEntityName' to 'NewEntityName'. Older devices can't process the new records.
Unresolved error Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration."
App is not in production, need a way to rename 'OldEntityName' to 'NewEntityName'. How to achieve this?
Post not yet marked as solved
Hi,
My middle schooler is working on a project for National Science Fair competition to estimate blood pressure from ppg signals. While he is using external database to develop his algorithm, it would be very useful to test it with real time data. I have a Series 6 watch and wondering how I can access my ppg sensor raw data.
Post marked as Apple Recommended
I've been using CloudKit for my app recently and I'm trying to add support for a WatchOS app and I've enabled iCloud in capabilities and ticked the container I want to use but I get this error.
CoreData: error: CoreData+CloudKit: -[NSCloudKitMirroringDelegate recoverFromPartialError:forStore:inMonitor:]block_invoke(1943): <NSCloudKitMirroringDelegate: 0x282430000>: Found unknown error as part of a partial failure: <CKError 0x28112d500: "Permission Failure" (10/2007); server message = "Invalid bundle ID for container"; uuid = ; container ID = "iCloud.Appname">
I tried creating a new container which worked for both the watch app and iOS app however I would like to use my original container since it has my old data
I'm working on an iOS app using SwiftUI and CoreData and am running into a problem that I cannot seem to figure out.
To provide a little bit of information of what I am trying to do:
I have two CoreData entities that have a One-To-Many relationship:
Tarantula - A tarantula may molt many times (To Many) and when deleted, all of the molts shold also be removed (Cascade)
Molt - A molt belongs to a single Tarantula (To One) and when
deleted, should have the reference removed from the Tarantula (Nullify)
I then have a view that lists all of the molts for a given Tarantula that allows adding and deleting molts. It looks like this:
struct MoltListView: View {
		private static let DATE_FORMATTER: DateFormatter = {
						let d = DateFormatter()
						d.dateFormat = "MMM d, y"
						return d
				}()
		
		@Environment(\.managedObjectContext) private var viewContext
		
		@ObservedObject private var tarantula: Tarantula
		@FetchRequest private var molts: FetchedResults<Molt>
		@State private var userMessage: String = ""
		@State private var displayMessage: Bool = false
		
		init(tarantula: Tarantula) {
				self.tarantula = tarantula
				self._molts = FetchRequest(entity: Molt.entity(),
																	 sortDescriptors: [NSSortDescriptor(keyPath: \Molt.date, ascending: false)],
																	 predicate: NSPredicate(format: "tarantula = %@", tarantula))
		}
		
		var body: some View {
				List {
						Section(header: Text("Summary")) {
								Text("\(molts.count) Molt\(molts.count == 1 ? "" : "s")")
						}
						Section(header: Text("Molts")) {
								NavigationLink(destination: MoltView(tarantula: tarantula, molt: Molt.newModel())) {
										Text("Add Molt").foregroundColor(.blue)
								}
								ForEach(molts, id: \.self) { molt in
										NavigationLink(destination: MoltView(tarantula: tarantula, molt: molt)) {
												Text(MoltListView.DATE_FORMATTER.string(from: molt.modelDate))
										}
								}
								.onDelete(perform: deleteItems)
						}
				}.alert(isPresented: $displayMessage) {
						Alert(title: Text("Save Failure"), message: Text(userMessage), dismissButton: .default(Text("Ok")))
				}
		}
		
		private func deleteItems(offsets: IndexSet) {
				withAnimation {
						offsets.map { molts[$0] }.forEach(viewContext.delete)
						do {
								try viewContext.save()
						} catch {
								viewContext.rollback()
								userMessage = "\(error): \(error.localizedDescription)"
								displayMessage.toggle()
						}
				}
		}
}
The error I am experiencing comes from whenever I try to delete a molt from the list view. The app instantly crashes and the error is:
Simultaneous accesses to 0x7f92efc61cb8, but modification requires exclusive access
Find the complete error here:
error - https://developer.apple.com/forums/content/attachment/6d74dcde-d82b-4024-ade0-5936d8926488
I have tried removing the animation block and have played around with removing different UI components/restructuring.
The only way I have been able to prevent this error is to remove the delete rule on the Molt->Tarantula relationship from Nullify to No Action. However, this seems more like a hack to me instead of a fix.
Was hoping for some help on this issue.
Post not yet marked as solved
I've a large data feed to load in database. this data populate many entities that are related each others. I've follow this official tutorial - https://developer.apple.com/documentation/coredata/loading_and_displaying_a_large_data_feed to use nsbatchInsertRequest.
But this tutorial has one big bug: populate data only in one entity. How many apps use a database with only one entity?
therefore the problem that I have not only me, but several people, is time. With nsbatchinsertrequst I was able to insert more than 30000 records in just 5 seconds with a use of just 25MB of RAM. But without setting up relationships. if after the execution of the various insertrequests I set the relations, everything takes me about 50 seconds with an increase in memory to 60-70 MB.
Is it possible that there is no way to quickly set up relationships? Not only that, this is a forum where Apple engineers, who therefore know the subject better, should give help. but who knows why, for such questions they disappear. Maybe it's my posts that are so boring that Apple ignores them? Or are they so difficult that even apple engineers can't solve them? Who knows if I'll ever find the answer! But is it possible that they don't have a solution? These Apple engineers if they had the same problem as me, how would they solve it? they simply say: "it can't be done! Arrange!"?
anyway, I hope that some Apple engineer or someone experienced will be able to find the solution at least to this problem. Or it will be another zombie post in the billions of zombie posts of people like me who pay $ 100 but get no support.
Thank you
I have an app that is already running with CoreData, and I want to allow the users to upload their data to iCloud so, in the case they need to delete their apps or change devices, they don't lose it.
Every time the app is opened, there is a synchronization that happens between CoreData and a JSON file fixture, in order to fill the app with its base values (creating NSManagedObject instances from the aforementioned fixture).
Before the iCloud sync, the CoreData model had some constraints for different entities, to enforce uniqueness, but these had to be stripped since CloudKit doesn't support them. Most of these constraints were basically ids that came from the JSON and represent an item in our Firebase database.
Given that, I want to make the underlying CKRecord.id the same as these ids, so I can avoid the situation where, if a person open the app in a second device, the fixture data is repeated, since the fixture runs before the sync with the iCloud happens.
Is that possible? Any help would be appreciated.
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I am getting the following error while saving data to CoreData. my model has the dictionary property. I created NSSecureCoding and NSSecureUnarchiveFromDataTransformer classes. please check if i can encode my model correctly. I couldn't understand what I am doing wrong ? The problem is not with Dictionary or Data properties. Why can't I save data to CoreData?
I know little English. Thank you for your understanding.
GitLab Project Link:
It is a very simple one page project. I will be glad if you check it out.
Core Data Test Project
Console Output:
2021-08-21 23:58:18.490834+0300 CoreDataTest[35689:2901360] [error] error: SQLCore dispatchRequest: exception handling request: <NSSQLSaveChangesRequestContext: 0x2827f0240> , <shared NSSecureUnarchiveFromData transformer> threw while encoding a value. with userInfo of (null)
CoreData: error: SQLCore dispatchRequest: exception handling request: <NSSQLSaveChangesRequestContext: 0x2827f0240> , <shared NSSecureUnarchiveFromData transformer> threw while encoding a value. with userInfo of (null)
Failed to save selected category: A Core Data error occurred.
Core Data Entity:
My Custom Model:
Notice my model has a Dictionary.
var sections: [QuestionSections.RawValue : String]
I am trying to save dictionary in CoreData. I thought the problem was in the dictionary but the problem is not in the dictionary.
class QuestionContainer: NSObject, Codable {
var questionCategories: [Question]
init(questionCategories: [Question]) {
self.questionCategories = questionCategories
}
}
public class Question: NSObject, Codable {
var title: String
var id: String
var questions: [QuestionList]
init(title: String, id: String, questions: [QuestionList]) {
self.title = title
self.id = id
self.questions = questions
}
}
public class QuestionList: NSObject, Codable {
init(id: String, question: String, isQuestionImage: Bool, isSectionImage: Bool, imageURL: String, imageData: Data? = nil, sections: [QuestionSections.RawValue : String], selected: String, correct: String) {
self.id = id
self.question = question
self.isQuestionImage = isQuestionImage
self.isSectionImage = isSectionImage
self.imageURL = imageURL
self.imageData = imageData
self.sections = sections
self.selected = selected
self.correct = correct
}
var id: String
var question: String
var isQuestionImage, isSectionImage: Bool
var imageURL: String
var imageData: Data?
var sections: [QuestionSections.RawValue : String]
var selected: String
var correct: String
}
enum QuestionSections: String, Codable {
case A = "A"
case B = "B"
case C = "C"
case D = "D"
}
NSSecure Unarchive From Data Transformer:
@objc(QuestionsValueTransformer)
class QuestionsValueTransformer: NSSecureUnarchiveFromDataTransformer {
static let name = NSValueTransformerName(rawValue: String(describing: QuestionsValueTransformer.self))
override static var allowedTopLevelClasses: [AnyClass] {
return [QuestionsNSSecureCoding.self]
}
public static func register() {
let transformer = QuestionsValueTransformer()
ValueTransformer.setValueTransformer(transformer, forName: name)
}
}
CoreData Save Function:
func saveSelectedQuestion(questionTitle: String, id: String, questions: [QuestionList]) {
let questionsCD = QuestionCD(context: persistentContainer.viewContext)
questionsCD.title = questionTitle
questionsCD.id = id
questionsCD.questions = questions
do {
try persistentContainer.viewContext.save()
} catch {
print("Failed to save selected category: \(error.localizedDescription)")
}
}
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In my app I have a defaultJournal: Journal, that automatically gets added on the user's device on launch. There should only be one "default" journal, and I know that deduplication as shown in the Apple Demo, is the correct approach to ensure this on multiple devices. Journal looks something like:
class Journal: NSManagedObject {
@NSManaged var isDefaultJournal: Bool
@NSManaged var entries: Set<JournalEntry>?
}
Since Journal has a relationship to entries, how can I deduplicate it ensuring that I don't orphan or delete the entries?
I am worried that the entries aren't guaranteed to be synced, when we discover a duplicate journal in processPersistentHistory.
This would lead to either orphaned or deleted entries depending on the deletion rule.
How can one handle deduplicating entities with relationships?
For example here is my remove function:
func remove(duplicateDefaultCalendarNotes: [Journal], winner: Journal, on context: NSManagedObjectContext) {
duplicateDefaultCalendarNotes.forEach { journal in
defer { context.delete(journal) }
// FIXME: What if all of the journal entries have not been synced yet from the cloud?
// Should we fetch directly from CloudKit instead? (could still lead to orphaned/deleted journal that have not yet been uploaded)
guard let entries = journal.entries else { return }
entries.forEach {
$0.journal = winner
}
}
}
A missing tag on a post isn't that bad, but deleting a user's journal is unacceptable. What is the best strategy to handle this?
Post not yet marked as solved
I have a music app that can play in the background, using AVQueuePlayer. I'm in the process of adding support for CloudKit sync of the CoreData store, switching from NSPersistentContainer to NSPersistentCloudKitContainer.
The initial sync can be fairly large (10,000+ records), depending on how much the user has used the app. The issue I'm seeing is this:
✅ When the app is in the foreground, CloudKit sync uses a lot of CPU, nearly 100% for a long time (this is expected during the initial sync).
✅ If I AM NOT playing music, when I put the app in the background, CloudKit sync eventually stops syncing until I bring the app to the foreground again (this is also expected).
❌ If I AM playing music, when I put the app in the background, CloudKit never stops syncing, which leads the system to terminate the app after a certain amount of time due to high CPU usage.
Is there any way to pause the CloudKit sync when the app is in the background or is there any way to mitigate this?
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My app is NOT using CoreData.
But I'm seeing this fault error in Console.app from mac when I build my iOS app:
CoreData: One or more models in this application are using transformable properties with transformer names that are either unset, or set to NSKeyedUnarchiveFromDataTransformerName. Please switch to using "NSSecureUnarchiveFromData" or a subclass of NSSecureUnarchiveFromDataTransformer instead. At some point, Core Data will default to using "NSSecureUnarchiveFromData" when nil is specified, and transformable properties containing classes that do not support NSSecureCoding will become unreadable.
What could be the cause of it?
What's the potential security issue it will cause to the app?
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I'm using NSPersistentCloudKitContainer with Core Data and I receive errors because my iCloud space is full. The errors printed are the following: <CKError 0x280df8e40: "Quota Exceeded" (25/2035); server message = "Quota exceeded"; op = 61846C533467A5DF; uuid = 6A144513-033F-42C2-9E27-693548EF2150; Retry after 342.0 seconds>.
I want to inform the user about this issue, but I can't find a way to access the details of the error. I'm listening to NSPersistentCloudKitContainer.eventChangedNotification, I receive a error of type .partialFailure. But when I want to access the underlying errors, the partialErrorsByItemID property on the error is nil.
How can I access this Quota Exceeded error?
import Foundation
import CloudKit
import Combine
import CoreData
class SyncMonitor {
fileprivate var subscriptions = Set<AnyCancellable>()
init() {
NotificationCenter.default.publisher(for: NSPersistentCloudKitContainer.eventChangedNotification)
.sink { notification in
if let cloudEvent = notification.userInfo?[NSPersistentCloudKitContainer.eventNotificationUserInfoKey] as? NSPersistentCloudKitContainer.Event {
guard let ckerror = cloudEvent.error as? CKError else {
return
}
print("Error: \(ckerror.localizedDescription)")
if ckerror.code == .partialFailure {
guard let errors = ckerror.partialErrorsByItemID else {
return
}
for (_, error) in errors {
if let currentError = error as? CKError {
print(currentError.localizedDescription)
}
}
}
}
} // end of sink
.store(in: &subscriptions)
}
}
Post not yet marked as solved
Dear:
Use core data to store super long strings. After storage, the strings are incomplete.
Xcode tips：
CoreData: debug: PostSaveMaintenance: fileSize 30409752 greater than prune threshold
CoreData: annotation: PostSaveMaintenance: wal_checkpoint(TRUNCATE)
help me?
Post not yet marked as solved
Hi,
I thought this should be quite easy and maybe I only have tomatoes on my eyes, but I cannot find out how to call an action when the user clicks the red button or use CMD-W to close the Preferences window (= Settings Scene).
I use Core Data. In the Preferences, many data structures, which define my system, are changed.
I learned, that you shouldn't save too often to avoid performance problems, so now I want to save the Core Data context when the user closes the Preferences window.
I tried .onDisappear, onChange of focus etc. but this didn't work.
How can I define an action?
Any hints are welcome :-)
