Core Data viewContext not receiving updates from newBackgroundContext() with NSFetchedResultsController

Question

In my application, I have a NSFetchedResultsController to load Core Data objects in a UITableView. The fetch request associated with this FRC uses the new vie

Answer 1

Not worked for me, So I changed save block from

self.persistentContainer.performBackgroundTask { (context) ... }

to

self.persistentContainer.newBackgroundContext().performAndWait { ... }

and of corse setting true automaticallyMergesChangesFromParent to make auto merge work.

lazy var viewContext: NSManagedObjectContext = {
    self.persistentContainer.viewContext.automaticallyMergesChangesFromParent = true
    self.presistentContainer.viewContext.mergePolicy = NSMergePolicy.mergeByPropertyObjectTrump
    return self.persistentContainer.viewContext
}()

I don't know why the context from performBackgroundTask not merged to viewContext.