Swift: Difficulty with updating Core Data objects after fetch with background context in iOS 17
I tried several approaches but none seem to work. I'm prototyping a solution and I'm sure I'm missing something obvious here, but I'm experiencing an scenario where my Core Data objects aren't updating as expected after performing a fetch request using a background context in my Swift app targeting iOS 17. I'm using the `NSPersistentContainer` for my Core Data stack, and I'm trying to fetch and update an object in the background. However, when I save changes, the main context doesn't reflect those changes even after merging the changes. Here's a simplified version of what I'm trying to do: ```swift let backgroundContext = persistentContainer.newBackgroundContext() backgroundContext.perform { [weak self] in let fetchRequest: NSFetchRequest<MyEntity> = MyEntity.fetchRequest() fetchRequest.predicate = NSPredicate(format: "id == %@", myObjectId) do { let results = try backgroundContext.fetch(fetchRequest) if let objectToUpdate = results.first { objectToUpdate.someProperty = "New Value" try backgroundContext.save() } } catch { print("behavior fetching or saving: \(behavior)") } } // Merging changes to the main context persistentContainer.viewContext.perform { do { try persistentContainer.viewContext.save() } catch { print("behavior saving main context: \(behavior)") } } ``` After executing this, I expect that `someProperty` of the fetched object in the main context reflects the updated value. However, when I check the main context, it still has the old value. I'm calling `mergeChanges(fromContextDidSave:)` on the main context, yet the updates are not visible. I've also tried to manually call `mergeChanges(fromContextDidSave:)` after the background context saves: ```swift NotificationCenter.default.addObserver(forName: NSManagedObjectContext.didSaveNotification, object: backgroundContext, queue: nil) { notification in self.persistentContainer.viewContext.mergeChanges(fromContextDidSave: notification) } ``` Despite these efforts, the data seems stale. Any insights into what I might be doing wrong or if there’s a better way to handle context merging in this scenario? Thanks! Any help would be greatly appreciated! The project is a REST API built with Swift. I'm working in a Ubuntu 22.04 environment. Hoping someone can shed some light on this.