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Core Data observer exception in 10.6

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Core Data observer exception in 10.6

Subject: Core Data observer exception in 10.6
From: David Sinclair <email@hidden>
Date: Sat, 29 Aug 2009 13:48:09 -0700

Hi,

In a Core Data-based app that works fine in 10.5.x, I now get an exception as follows in 10.6 when opening a document. It targets 10.5, and the same exception occurs when rebuilding on 10.6 (still targeting 10.5, but also when targeting 10.6).

I don't register or unregister any observers myself, and the exception occurs without touching any of my code. What's going on?

NSRangeException: Cannot remove an observer <NSKeyValueObservance 0x15476c0> for the key path "richText" from <TextEntity 0x1546380> because it is not registered as an observer. 1 +[NSException raise:format:arguments:] (in CoreFoundation) + 136 2 +[NSException raise:format:] (in CoreFoundation) + 58 3 -[NSObject(NSKeyValueObserverRegistration) _removeObserver:forProperty:] (in Foundation) + 765 4 -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:] (in Foundation) + 176 5 -[NSKeyValueNestedProperty object:didRemoveObservance:recurse:] (in Foundation) + 544 6 -[NSObject(NSKeyValueObserverRegistration) _removeObserver:forProperty:] (in Foundation) + 453 7 -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:] (in Foundation) + 176 8 -[_NSModelObservingTracker _registerOrUnregister:observerNotificationsForModelObject:] (in AppKit) + 228 9 -[_NSModelObservingTracker clearAllModelObjectObserving] (in AppKit) + 341 10 -[_NSModelObservingTracker setIndexReferenceModelObjectArray:clearAllModelObjectObserving:] (in AppKit) + 51 11 -[NSArrayController _setObjects:] (in AppKit) + 196 12 -[NSArrayController _arrangeObjectsWithSelectedObjects:avoidsEmptySelection:operationsMask:useBasis :] (in AppKit) + 510 13 -[NSArrayController rearrangeObjects] (in AppKit) + 133 14 -[NSArrayController observeValueForKeyPath:ofObject:change:context:] (in AppKit) + 338 15 NSKeyValueDidChange (in Foundation) + 377 16 -[NSObject(NSKeyValueObservingPrivate) _didChangeValuesForKeys:] (in Foundation) + 565 17 _PFFaultHandlerFulfillFault (in CoreData) + 1921 18 _PFFaultHandlerLookupRow (in CoreData) + 1573 19 -[NSFaultHandler fulfillFault:withContext:] (in CoreData) + 39 20 _PF_FulfillDeferredFault (in CoreData) + 193 21 _sharedIMPL_pvfk_core (in CoreData) + 65 22 -[NSManagedObject(_PFDynamicAccessorsAndPropertySupport) _genericValueForKey:withIndex:flags:] (in CoreData) + 79 23 -[NSManagedObject valueForKey:] (in CoreData) + 244 24 -[NSKeyValueNestedProperty object:didAddObservance:recurse:] (in Foundation) + 240 25 -[NSObject(NSKeyValueObserverRegistration) _addObserver:forProperty:options:context:] (in Foundation) + 812 26 -[NSObject(NSKeyValueObserverRegistration) addObserver:forKeyPath:options:context:] (in Foundation) + 565 27 -[_NSModelObservingTracker _registerOrUnregister:observerNotificationsForKeyPath:ofModelObject:] (in AppKit) + 134 28 -[_NSModelObservingTracker _registerOrUnregister:observerNotificationsForModelObject:] (in AppKit) + 228 29 -[_NSModelObservingTracker _startObservingModelObject:] (in AppKit) + 418 30 -[_NSModelObservingTracker startObservingModelObjectsAtReferenceIndexes:] (in AppKit) + 333 31 -[NSArrayController _arrangeObjectsWithSelectedObjects:avoidsEmptySelection:operationsMask:useBasis :] (in AppKit) + 510 32 -[NSArrayController setContent:] (in AppKit) + 889 33 -[NSArrayController(NSManagedController) _performFetchWithRequest:merge:error:] (in AppKit) + 501 34 -[NSObjectController(NSManagedController) fetchWithRequest:merge:error:] (in AppKit) + 209 35 -[NSObjectController(NSManagedController) _executeFetch:didCommitSuccessfully:actionSender:] (in AppKit) + 106 36 _NSSendCommitEditingSelector (in AppKit) + 339 37 -[NSController _controllerEditor:didCommit:contextInfo:] (in AppKit) + 216 38 __invoking___ (in CoreFoundation) + 29 39 -[NSInvocation invoke] (in CoreFoundation) + 136 40 -[NSInvocation invokeWithTarget:] (in CoreFoundation) + 72 41 __NSFireDelayedPerform (in Foundation) + 537 42 __CFRunLoopRun (in CoreFoundation) + 6846

Immediately after that exception is a related one, which sounds more helpful, but still doesn't make sense to me:

NSInternalInconsistencyException: Cannot remove an observer <NSArrayController 0x1452df0> for the key path "text.richText" from <ChapterEntity 0x1487b40>, most likely because the value for the key "text" has changed without an appropriate KVO notification being sent. Check the KVO-compliance of the ChapterEntity class. 1 +[NSException raise:format:arguments:] (in CoreFoundation) + 136 2 +[NSException raise:format:] (in CoreFoundation) + 58 3 -[NSKeyValueNestedProperty object:didRemoveObservance:recurse:] (in Foundation) + 457 4 -[NSObject(NSKeyValueObserverRegistration) _removeObserver:forProperty:] (in Foundation) + 453 5 -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:] (in Foundation) + 176 6 -[_NSModelObservingTracker _registerOrUnregister:observerNotificationsForModelObject:] (in AppKit) + 228 7 -[_NSModelObservingTracker clearAllModelObjectObserving] (in AppKit) + 341 8 -[_NSModelObservingTracker setIndexReferenceModelObjectArray:clearAllModelObjectObserving:] (in AppKit) + 51 9 -[NSArrayController _setObjects:] (in AppKit) + 196 10 -[NSArrayController _arrangeObjectsWithSelectedObjects:avoidsEmptySelection:operationsMask:useBasis :] (in AppKit) + 510 11 -[NSArrayController rearrangeObjects] (in AppKit) + 133 12 -[NSArrayController observeValueForKeyPath:ofObject:change:context:] (in AppKit) + 338 13 NSKeyValueDidChange (in Foundation) + 377 14 -[NSObject(NSKeyValueObservingPrivate) _didChangeValuesForKeys:] (in Foundation) + 565 15 _PFFaultHandlerFulfillFault (in CoreData) + 1921 16 _PFFaultHandlerLookupRow (in CoreData) + 1573 17 -[NSFaultHandler fulfillFault:withContext:] (in CoreData) + 39 18 _PF_FulfillDeferredFault (in CoreData) + 193 19 _sharedIMPL_pvfk_core (in CoreData) + 65 20 -[NSManagedObject(_PFDynamicAccessorsAndPropertySupport) _genericValueForKey:withIndex:flags:] (in CoreData) + 79 21 -[NSManagedObject valueForKey:] (in CoreData) + 244 22 -[NSKeyValueNestedProperty object:didAddObservance:recurse:] (in Foundation) + 240 23 -[NSObject(NSKeyValueObserverRegistration) _addObserver:forProperty:options:context:] (in Foundation) + 812 24 -[NSObject(NSKeyValueObserverRegistration) addObserver:forKeyPath:options:context:] (in Foundation) + 565 25 -[_NSModelObservingTracker _registerOrUnregister:observerNotificationsForKeyPath:ofModelObject:] (in AppKit) + 134 26 -[_NSModelObservingTracker _registerOrUnregister:observerNotificationsForModelObject:] (in AppKit) + 228 27 -[_NSModelObservingTracker _startObservingModelObject:] (in AppKit) + 418 28 -[_NSModelObservingTracker startObservingModelObjectsAtReferenceIndexes:] (in AppKit) + 333 29 -[NSArrayController _arrangeObjectsWithSelectedObjects:avoidsEmptySelection:operationsMask:useBasis :] (in AppKit) + 510 30 -[NSArrayController setContent:] (in AppKit) + 889 31 -[NSArrayController(NSManagedController) _performFetchWithRequest:merge:error:] (in AppKit) + 501 32 -[NSObjectController(NSManagedController) fetchWithRequest:merge:error:] (in AppKit) + 209 33 -[NSObjectController(NSManagedController) _executeFetch:didCommitSuccessfully:actionSender:] (in AppKit) + 106 34 _NSSendCommitEditingSelector (in AppKit) + 339 35 -[NSController _controllerEditor:didCommit:contextInfo:] (in AppKit) + 216 36 __invoking___ (in CoreFoundation) + 29 37 -[NSInvocation invoke] (in CoreFoundation) + 136 38 -[NSInvocation invokeWithTarget:] (in CoreFoundation) + 72 39 __NSFireDelayedPerform (in Foundation) + 537 40 __CFRunLoopRun (in CoreFoundation) + 6846 41 CFRunLoopRunSpecific (in CoreFoundation) + 452 42 CFRunLoopRunInMode (in CoreFoundation) + 97 43 RunCurrentEventLoopInMode (in HIToolbox) + 392 44 ReceiveNextEventCommon (in HIToolbox) + 354 45 BlockUntilNextEventMatchingListInMode (in HIToolbox) + 81 46 _DPSNextEvent (in AppKit) + 847 47 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] (in AppKit) + 156 48 -[NSApplication run] (in AppKit) + 821 49 NSApplicationMain (in AppKit) + 574 50 main (in Narrator) (main.m:14)


ChapterEntity is:

@interface ChapterEntity : NSManagedObject
{
}

@property(copy) NSString *name;
@property(copy) NSImage *tableImage;
@property(assign) TextEntity *text;
@property(assign) DocumentEntity *document;

@end


@implementation ChapterEntity

@dynamic name, tableImage, text, document;

- (void)awakeFromInsert;
{
    [super awakeFromInsert];

NSManagedObjectContext *managedObjectContext = [self managedObjectContext];

self.tableImage = [NSImage imageNamed:@"GenericDocument"]; self.text = [NSEntityDescription insertNewObjectForEntityForName:@"Text" inManagedObjectContext:managedObjectContext]; }

@end

But the exception occurs even if I comment out the contents of - awakeFromInsert.

And TextEntity has just dynamic properties, no code.

Any ideas?

--

David Sinclair, Dejal Systems, LLC - email@hidden
Dejal blog - http://www.dejal.com/blog/
Cocoa code - http://www.dejal.com/developer/
Twitter - http://twitter.com/dejal/


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