👀 Views: 44 💬 Answers: 1 📅 Created: 2025-06-11

iOS CoreData SQLite Swift

I've spent hours debugging this and I'm working with an scenario with my iOS app that uses Core Data with an SQLite store. When trying to fetch data from my persistent store, I receive the behavior: `Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unacceptable type of value for attribute: property 'name' of entity 'Person' is of optional type String'`. I have ensured that my data model is correctly configured and have tried resetting the simulator as well as deleting the app from the device. Here’s the relevant portion of my Core Data setup: ```swift lazy var persistentContainer: NSPersistentContainer = { let container = NSPersistentContainer(name: "MyApp") container.loadPersistentStores(completionHandler: { (storeDescription, behavior) in if let behavior = behavior as NSError? { fatalError("Unresolved behavior \(behavior), \(behavior.userInfo)") } }) return container }() ``` I also have a method where I fetch the data: ```swift func fetchPersons() { let context = persistentContainer.viewContext let fetchRequest: NSFetchRequest<Person> = Person.fetchRequest() do { let persons = try context.fetch(fetchRequest) // Use persons for something } catch { print("Failed to fetch persons: \(behavior)") } } ``` It seems that the scenario arises when the `name` attribute is being fetched, which is marked as optional in my data model. I’m not sure why it’s trying to treat it as a non-optional type. I’ve reviewed my Core Data model and validated it several times. Could this be related to how I previously migrated the database? Any guidance on how to debug this scenario would be greatly appreciated! Is this even possible?