hi, i am assuming that you are describing this problem: you tap the Add button inTaskItemsView the addTask() function does indeed add a new Task to the list (var list: TaskList) the TaskItemsView does not update if that's the case, in TaskItemsView, you should do two things: define the list variable as @ObservedObject var list: TaskList. this makes the TaskItemsView responsive to changes in Core Data attributes of the list. after line 43 (list.addToItems(newTask)) add list.objectWillChange.send(). adding a new TaskItem to the list's NSSet of TaskItems is not seen as a change to a list attribute (its reference to the NSSet), so you need to signal a change to the list yourself. hope that helps, DMG

hi, your question made me realize i had something like this situation occurring as a very remote possibility in one of my projects. my solution (which works, as far as i have tested) is: when a detail view is initialized, record the id of the object you display (you do have an id: UUID? attribute on the object, yes?). with every .onAppear() of the DetailView, use a Core Data fetch to see whether you still have a CD object with that id. if no such object exists, then just dismiss the detail view right away. hope that helps, DMG

hi Bernhard, you could take a look at my ShoppingList14 project over on GitHub - https://www.github.com/delawaremathguy/ShoppingList14, where i (sort of) solve the problem of having two edit views open on the same CD object in two different tabs and "delete" the object in one of those views. i make sure that the second one goes away before it can be seen when returning to the other tab. you will find my comments about this situation in the file AddOrModifyItemView.swift. i can't say i know enough about using isFault, since it will be true when the object is deleted, but isDeleted will be false. on the other item you mentioned, about changing a property of a CD object Y that's associated via some relationship with a CD object X, no change has been made to the attributes of X (only to the underlying NSSet or NSOrderedSet for the relationship of X). so X never sees a change to one of the properties in Y. you can work around this; when a change is made to Y, find any and all X to which it is related and call X.objectWillChange.send(). you will find that i do this in ShoppingList14, and i have included some lengthy comments about this strategy, mostly for the case where X has computed properties that are based on the associated Ys (see Item+Extensions.swift and Location+Extensions.swift). hope that helps, DMG

hi, did you set NSPersistentHistoryTrackingKey and NSPersistentStoreRemoteChangeNotificationPostOptionKey, along with automaticallyMergesChangesFromParent and the mergePolicy? i use this code. guard let persistentStoreDescriptions = container.persistentStoreDescriptions.first else { fatalError("\(#function): Failed to retrieve a persistent store description.") } persistentStoreDescriptions.setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey) persistentStoreDescriptions.setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey) container.loadPersistentStores(completionHandler: { (storeDescription, error) in ... }) container.viewContext.automaticallyMergesChangesFromParent = true container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy there's also a recent article by Becky Hansmeyer (h ttps://beckyhansmeyer.com) that may be helpful. hope that helps, DMG

hi, instead of writing from = filter.criteria.from ?? "" to = filter.criteria.to ?? "" you should be writing _from = State(initialValue: filter.criteria.from ?? "") _to = State(initialValue: filter.criteria.to ?? "") this is a syntactic issue with @State: you need to initialize the property wrapper, not its value. hope that helps, DMG

hi, we do not see the definition of category in this view, but i am hoping that it would ideally be @ObservedObject var category: Category // not an optional, so reference category.CitemsArray in the ForEach you should know that changing a property of one of the category's associated items is not seen as a change to the category object itself, and it will not trigger a visual update of the view. when you do item.done.toggle() in the .onTapGesture, consider registering an explicit change on the category object with category.objectWillChange.send() hope that helps, DMG

hi, it may be as simple as not turning on history tracking. in my code, i usually have these lines right after creating the NSPersistentCloudKitContainer: // (1) Enable history tracking. this seems to be important when you have more than one persistent // store in your app (e.g., when using the cloud) and you want to do any sort of cross-store // syncing. See WWDC 2019 Session 209, "Making Apps with Core Data." guard let persistentStoreDescription = container.persistentStoreDescriptions.first else { fatalError("\(#function): Failed to retrieve a persistent store description.") } persistentStoreDescription .setOption(true as NSNumber, forKey: NSPersistentHistoryTrackingKey) persistentStoreDescription .setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey) hope that helps, DMG

hi, change the declaration var item: Item in DetailView to @ObservedObject var item: Item changes to the item will then trigger a view update for the DetailView. that should do it, i think. hope that helps, DMG

Yup, it's one year later, and things have changed. i did indeed find out that iCloud does not work with an Ordered relationship. in the end, there were only two, fixed image data objects i needed: one for a 48 by 48 image, and one for a 144 by 144 image. i just made them attributes of an Entity, rather than separate Entities via a relationship that are indexed 0 ... 1, with a reasonable compression value. i marked the attributes in Core Data as "Allows External Storage." if i run into problems in the future, i will come back to it (!) DMG

hi, since you are using NSPersistentCloudKitContainer, you might want to take a look at Apple's page on Linking Data Between Two Core Data Stores. this provides a mechanism so that you can load up what i think you are calling "base values" in a local store, separate from the store that is mirrored to iCloud. this would solve the problem of loading base values on one machine, moving them into the cloud, and then trying to figure out on a second device how to prevent them from being reloaded from iCloud. hope that helps, DMG

hi, i think you should take the error message as is and paste the string NSSecureUnarchiveFromDataTransformerName directly into the Transformer entry where it indicates "Value Transformer name". that will do it. as to what this means in the future: who knows? i doubt that it will go away. this has more to do with security rather than any feature that will be changing. as for best practices: transformable data is not directly searchable in Core Data. that doesn't mean that you cannot search by dates, pulling all records and then, one-by-one, examining its array of dates. it's just that Core Data cannot do it with a simple fetch. hope that helps, DMG

hi, you can certainly do a fetch directly with core data; but if you expect your class object to find out about changes in Core Data and act like you had a @FetchRequest, you would want to use an NSFetchedResultsController in your object to see changes over time. hope that helps, DMG

hi, why not simply write the predicate as NSPredicate(format: "clientId == %@", clientId! as CVarArg) // i would think the force unwrap would help here ? i have used this; it works. hope that helps, DMG

hi, your ViewModel simply needs to use an NSFetchedResultsController to hook into Core Data, and keep the array of Core Data objects that you would ordinarily define in the View (using @FetchRequest) as a @Published property. whenever the resultsController fires, update the array property. be sure your View keeps a reference to the ViewModel as an @ObservedObject. hope that helps, DMG

hi, the easiest, fastest way might just be to change the definition of numbers, so that the elements appears with the frequencies you like. since we're talking 1/20-ths here (multiples of 5%), give the array 20 elements: let numbers = ["1", "1", "2", "2", "2", "2", "3", "3", "3", "3", "3", "3", "4", "4", "4", "4", "4", "4", "4", "5"] if let pickedNumber = numbers.randomElement() { print(pickedNumber) } there are more general ways to do this, but keep it simple for now .. hope that helps, DMG