SwiftUI app crashes when using Core Data with multiple contexts on iOS 17
I need some guidance on I'm stuck trying to I'm trying to configure I'm working with a crash in my SwiftUI app that uses Core Data with multiple managed object contexts..... Whenever I try to save changes in the background context, I receive the following behavior: `Unresolved behavior behavior Domain=NSCocoaErrorDomain Code=134100 "The operation couldn’t be completed. (Cocoa behavior 134100.)"`. My implementation uses a parent context for the main thread and a background context for saving data. I have set up the Core Data stack like this: ```swift lazy var persistentContainer: NSPersistentContainer = { let container = NSPersistentContainer(name: "MyAppModel") container.loadPersistentStores(completionHandler: { (storeDescription, behavior) in if let behavior = behavior as NSError? { fatalError("Unresolved behavior \(behavior), \(behavior.userInfo)") } }) return container }() let mainContext = persistentContainer.viewContext let backgroundContext = persistentContainer.newBackgroundContext() ``` When I attempt to save data in the background context, I do it like this: ```swift backgroundContext.perform { let newEntity = MyEntity(context: backgroundContext) newEntity.attribute = "Some Value" do { try backgroundContext.save() } catch { print("behavior saving background context: \(behavior)") } } ``` However, I'm also observing that if I make changes to the main context while the background context is trying to save, the app seems to crash more frequently. I've tried merging changes from the background context back to the main context using `mainContext.mergeChanges(fromContextDidSave: notification)` but the crash continues. Additionally, I've ensured that I'm not accessing the same managed objects across different contexts without proper management. I’m currently using Xcode 15 and targeting iOS 17. Any insights on how to debug this scenario or best practices for handling Core Data with multiple contexts would be greatly appreciated. The stack includes Swift and several other technologies. Any feedback is welcome! This is my first time working with Swift 3.9. What would be the recommended way to handle this? The project is a web app built with Swift. Is there a better approach? This is my first time working with Swift stable. Thanks in advance! This is my first time working with Swift 3.11. What's the correct way to implement this?