Open Radar

 
Which area are you seeing an issue with?
Core Data API

Is this Feedback related to a Lab, Engineering Session, or Forum Topic from WWDC20?
Yes, an Engineering Session

Please provide the session title:
Core Data: Sundries and maxims

I noticed the new constants shown on the slide at 13:44 in the video for this session wwdc2020_10017_hd.mp4 aren't working correctly and I figured out why.

// new notification constant
let a1 = NSManagedObjectContext.didChangeObjectsNotification
print(a1)
        
outputs:
NSNotificationName(_rawValue: NSManagedObjectContextObjectsDidChangeNotification)

Which looks ok but in fact the string is wrong, meaning observing the notification doesn't work. To see the correct string we can output the old version of the constant:

        // old notification constant
        let a2 = NSNotification.Name.NSManagedObjectContextObjectsDidChange
        print(a2)

NSNotificationName(_rawValue: NSObjectsChangedInManagingContextNotification)

As you can see the correct string is "NSObjectsChangedInManagingContextNotification" and observing this does work.

Also, it appears all of the other new constants need fixed too.