a2-4.swift

//MARK: CRUD
func insertTodoItem( name: String, finished: Bool ) -> ToDoItem? {
    guard let toDoItem = NSEntityDescription.insertNewObject(forEntityName: "ToDoItem", into: backgroundContext) as? ToDoItem else { return nil }
    toDoItem.name = name
    toDoItem.finished = finished

    return toDoItem
}

func fetchAll() -> [ToDoItem] {
    let request: NSFetchRequest<ToDoItem> = ToDoItem.fetchRequest()
    let results = try? persistentContainer.viewContext.fetch(request)
    return results ?? [ToDoItem]()
}

func remove( objectID: NSManagedObjectID ) {
    let obj = backgroundContext.object(with: objectID)
    backgroundContext.delete(obj)
}

func save() {
    if backgroundContext.hasChanges {
        do {
            try backgroundContext.save()
        } catch {
            print("Save error \(error)")
        }
    }

}