When come to circular reference, it comes with risk of memory leaking, by not using a weak keyword. For instance :- Memory leak without using weak class Human { deinit { print("bye bye from Human") } init(_ pet: Pet) {…
Context I am working on a feature, that allows users to add Components to CoreData. Those Components are obviously NSManagedObjects inserted and saved into a Context. In addition, I also want to give the user a variety of predefined Components.…
I have this core data issue: *** -[NSKeyedUnarchiver decodeObjectForKey:]: value for key (id) is not an object. This will become an error in the future. First I would like to describe what I am trying to do: I perform a…
I posted this question: SwiftUI: deleting Managed Object from cell view crashes app? as I worked on trying to understand why it crashes, I tried to change the model Item to have timestamp NON-optional: extension Item { @nonobjc public class…
I have came across 2 demo CoreData projects, which involves transaction history. Both are using viewContext.setQueryGenerationFrom(.current) when they initialize their CoreData stack. FireballWatch demo from raywenderlich The demo is picked from https://www.raywenderlich.com/14958063-modern-efficient-core-data The author is trying to demonstrate, how to…
My app uses CoreData. One of the entities is final class ViewItem: NSManagedObject { // … } During unit tests, I am trying to execute the following fetch request: let viewItemFetchRequest = NSFetchRequest<ViewItem>(entityName: "ViewItem") as viewContext.performAndWait { do { let…
I have created Core Data database, and it has an entity called Item. If I want to create an instance of Item and add it to the database, I create it using Item(context: ). How can I create an instance…
I'm trying to implement this solution: Combine, Publishers, and Core Data but I'm getting the following error: Here is my implantation: class DataModel: ObservableObject { @Published var customers: [Task] = [] private var cancellables = Set<AnyCancellable>() init(viewContext: NSManagedObjectContext) { CDPublisher(request:…
I am storing images in Core Data as binary data, and showing them in another view via a LazyVGrid to replicate a CollectionView in UIKit. However, performance seems to be really choppy/poor on scroll and was wondering if there's any…
Currently, our app provides a backup functionality to user, where she can perform snapshot backup of app database. We are using migratePersistentStore to achieve such functionality. After running migratePersistentStore, we will execute other I/O operations. Some of the I/O operations…