Handling Multiple Simultaneous Core Data Fetch Requests in iOS 17 with SwiftUI
I'm migrating some code and I'm experimenting with I'm having trouble managing multiple simultaneous Core Data fetch requests in my SwiftUI application targeting iOS 17... I have a view that needs to display data from different entities based on user input, but when I trigger multiple fetch requests at once, I'm encountering unexpected behavior where some results are not displayed correctly or are duplicated. My current implementation uses the following code: ```swift @FetchRequest(entity: Entity1.entity(), sortDescriptors: []) var entity1Items: FetchedResults<Entity1> @FetchRequest(entity: Entity2.entity(), sortDescriptors: []) var entity2Items: FetchedResults<Entity2> var body: some View { VStack { List(entity1Items) { item in Text(item.name) } List(entity2Items) { item in Text(item.title) } } } ``` I've also set up my Core Data stack using the NSPersistentContainer, and I'm using a DispatchQueue to handle each fetch request. However, I'm seeing errors like "Unresolved error Error Domain=NSCocoaErrorDomain Code=134020" when trying to invoke an update or a fetch after a few rapid changes in the UI. To try and resolve this, I've implemented some throttling logic to prevent too many requests from firing off simultaneously, but I still see inconsistent data. I'm unsure if the FetchRequest is the right approach since it seems to be re-triggering and causing issues when the view updates. Should I be utilizing Combine's publishers to manage these requests more effectively? Any advice or suggestions on best practices for handling this in SwiftUI would be greatly appreciated. My development environment is Windows. Any help would be greatly appreciated! I'm on Ubuntu 22.04 using the latest version of Swift. I'm open to any suggestions. What's the best practice here? Cheers for any assistance!