I am implementing a custom migration, and facing an issue while implementing a WAL checkpointing.
Here is the code for WAL checkpointing
func forceWALCheckpointingForStore(at storeURL: URL, model: NSManagedObjectModel) throws {
let persistentStoreCoordinator = NSPersistentStoreCoordinator(managedObjectModel: model)
let options = [NSSQLitePragmasOption: ["journal_mode": "DELETE"]]
let store = try persistentStoreCoordinator.addPersistentStore(type: .sqlite, at: storeURL, options: options)
try persistentStoreCoordinator.remove(store)
}
When the coordinator tries to add the store I am getting the following error
fault: Store opened without NSPersistentHistoryTrackingKey but previously had been opened with NSPersistentHistoryTrackingKey - Forcing into Read Only mode store
My questions are
Is it really necessary to force WAL checkpointing before migration? I am expecting NSMigrationManager to handle it internally. I am assuming this because the migrateStore function asks for the sourceType where I am passing StoreType.sqlite
If checkpointing is required, then how do I address the original issue
Note:
Since my app supports macOS 13, I am not able to use the newly introduced Staged migrations.
There is similar question on Stackoverflow that remains unanswered. https://stackoverflow.com/q/69131577/1311902
Post
Replies
Boosts
Views
Activity
I am trying to migrate my Core Data model to a new version with a new attribute added to it. Since my app supports macOS 13 I am not able to use the newly introduced Staged migrations.
After much digging I found that the app is not able to find the Mapping Model when one of the attribute has "Preserve after deletion" enabled.
I have enabled migration debbuging using
com.apple.CoreData.MigrationDebug 1
I am getting following error
error: CoreData: error: (migration) migration failed with error Error Domain=NSCocoaErrorDomain Code=134140 "Persistent store migration failed, missing mapping model."
What is the way out here?
I am trying to add a custom policy to Entity Mapping and it refuses to work because the app name has a space in it. I tried replacing the space character with underscore and hyphen but it still does not work.
I tried creating an MVP where app name did not have any space and it worked in the first try. However, for another MVP where app name had a space in it, it is not working at all.
How do I scroll to a row and select it when it is part of collapsed rows in Table
ScrollViewReader { scrollViewProxy in
Table([node], children: \.children, selection: $selectedNodeID) {
TableColumn("Key") { Text($0.key) }
TableColumn("Value") { Text($0.val) }
}
.onChange(of: selectedNodeID) { _, newValue in
withAnimation {
scrollViewProxy.scrollTo(newValue)
}
}
}
The code above works well for the rows that are expanded or at the root level. However, for the rows that are not yet expanded the code above does nothing. How can I update the code so that it scrolls to a row that has not materialized yet.
Info:
This is a macOS app
I am on macOS 15.1.1 with Xcode 16.1 and the minimum target of the app is macOS 15
Some users of my app are reporting total loss of data while using the app.
This is happening specifically when they enable iCloud sync.
I am doing following
private func setupContainer(enableICloud: Bool) {
container = NSPersistentCloudKitContainer(name: "")
container.viewContext.automaticallyMergesChangesFromParent = true
container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
guard let description: NSPersistentStoreDescription = container.persistentStoreDescriptions.first else {
fatalError()
}
description.setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey)
description.setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey)
if enableICloud == false {
description.cloudKitContainerOptions = nil
}
container.loadPersistentStores { description, error in
if let error {
// Handle error
}
}
}
When user clicks on Toggle to enable/disable iCloud sync I just set the description.cloudKitContainerOptions to nil and then user is asked to restart the app.
Apart from that I periodically run the clear history
func deleteTransactionHistory() {
let sevenDaysAgo = Calendar.current.date(byAdding: .day, value: -7, to: Date())!
let purgeHistoryRequest = NSPersistentHistoryChangeRequest.deleteHistory(before: sevenDaysAgo)
let backgroundContext = container.newBackgroundContext()
backgroundContext.performAndWait {
try! backgroundContext.execute(purgeHistoryRequest)
}
}
I am trying to profile my app for 'Data Persistence', but I am not getting any data in the Instruments. I tried restarting Xcode and Mac, still no progress. It is showing blank graph for faults, fetches and saves