core-data

How to make a designated initializer for NSManagedObject subclass in Swift?

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A convenience initializer must call the designated initializer on self: convenience init(text: String, isCorrect: Bool, entity: NSEntityDescription, insertIntoManagedObjectContext context: NSManagedObjectContext!) { self.init(entity: entity, insertIntoManagedObjectContext: context) self.text = text self.isCorrect = isCorrect } which would be called as let newAlternative = Alternative(text: “third platform”, isCorrect: true, entity: entityDescription, insertIntoManagedObjectContext: managedObjectContext) In addition, you could also move … Read more

CoreData could not fulfill a fault for

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Hmm. Are you properly implementing concurrency following this guide? The problem you are seeing is a common one when using core data across multiple threads. Object was deleted in your “background context”, while then it’s being accessed by another context. Calling [context processPendingChanges] on your background context after the delete but before the save may … Read more

Core-Data iPhone: could not locate an NSManagedObjectModel

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Ok. Placing the following code inside of the RootViewController’s viewDidLoad eliminates the error: if (managedObjectContext == nil) { managedObjectContext = [(CoreDataBooksAppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext]; NSLog(@”After managedObjectContext: %@”, managedObjectContext); } I found someone with a similar problem here on SO: link text As Aryeh pointed out in that post: “In short you are trying to … Read more

Why Xcode does not show index options for CoreData entities and attributes?

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As @tomharrington said, the solution is in the WWDC 2017 video: Indexing stuff begins at 10:32 and the demo at 16:40. It’s still possible to create and index via Xcode9: First, select your entity, long-click on the + (Add Entity), and select Add Fetch Index. Then, name your index appropriately, the select the property you … Read more

Setting an NSManagedObject relationship in Swift

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As of Xcode 7 and Swift 2.0 (see release note #17583057), you are able to just add the following definitions to the generated extension file: extension PersonModel { // This is what got generated by core data @NSManaged var name: String? @NSManaged var hairColor: NSNumber? @NSManaged var parents: NSSet? // This is what I manually … Read more

Subclass.fetchRequest() Swift 3.0, extension not really helping 100%?

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The reason this is happening is there are two methods named fetchRequest in your Person class: first is in your model subclass (Person) with return type NSFetchRequest<Person> second is in NSManagedObject with return type NSFetchRequest<NSFetchRequestResult> That’s actually why it is ambiguous, compiler does not know which out of 2 you refer to. If you rename … Read more

Core Data’s NSPrivateQueueConcurrencyType and sharing objects between threads

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When you use NSPrivateQueueConcurrencyType you need to do anything that touches that context or any object belonging to that context inside the -performBlock: method. Your code above is illegal since you’re passing those objects back to the main queue. The new API helps you in solving this, though: You create one context that’s associated with … Read more

How to use Core Data’s ManagedObjectModel inside a framework?

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I’m a bit late for flohei’s issue, but hopefully this helps anybody else who wanders by. It is possible to get this to work without having to perform script-fu to copy resources around! By default Apple’s Core Data template gives you something like this: lazy var managedObjectModel: NSManagedObjectModel = { let modelURL = NSBundle.mainBundle().URLForResource(“MyCoreDataModel”, withExtension: … Read more

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