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Created March 12, 2011 00:47
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How to make a managed object complain if it's being turned into a fault while KVO observers are still registered with it.
Raw
gistfile1.m
- (void)willTurnIntoFault;
{
[super willTurnIntoFault];
if ([self observationInfo])
{
NSLog(@"%@ has observers:\n%@", [self objectID], [self observationInfo]);
}
}
@jstoffer
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So, I know that this was posted quite a while ago, but I was just curious if you've ever run into any strange problems having this in your code? I just tried to insert this in all of my managed objects after finding one that was being observed after its context was destroyed. However, when I tried to run with this in all of my objects, I started crashing and don't quite understand why:

thread #3: tid = 0x76b3e, 0x000000010914fd7b libobjc.A.dylib`objc_release + 11, queue = 'NSManagedObjectContext 0x611000190cc0', stop reason = EXC_BAD_ACCESS (code=2, address=0x60406080018d)

  • frame #0: 0x000000010914fd7b libobjc.A.dylib`objc_release + 11
  • frame #1: 0x00000001091510b8 libobjc.A.dylib`(anonymous namespace)::AutoreleasePoolPage::pop(void*) + 488
  • frame #2: 0x00000001096889c6 CoreFoundation`_CFAutoreleasePoolPop + 22
  • frame #3: 0x0000000108041e89 Foundation`-[NSAutoreleasePool drain] + 153
  • frame #4: 0x00000001084d0e71 CoreData`-[_PFManagedObjectReferenceQueue _processReferenceQueue:] + 2065
  • frame #5: 0x000000010856de02 CoreData`__89-[NSManagedObjectContext(_NSInternalNotificationHandling) _registerAyncReferenceCallback]_block_invoke + 98
  • frame #6: 0x00000001084f6f17 CoreData`developerSubmittedBlockToNSManagedObjectContextPerform + 199
  • frame #7: 0x0000000102fcc97e libclang_rt.asan_iossim_dynamic.dylib`asan_dispatch_call_block_and_release + 302
  • frame #8: 0x000000010a18d49b libdispatch.dylib`_dispatch_client_callout + 8
  • frame #9: 0x000000010a173988 libdispatch.dylib`_dispatch_queue_drain + 2215
  • frame #10: 0x000000010a172ea9 libdispatch.dylib`_dispatch_queue_invoke + 601
  • frame #11: 0x000000010a175af2 libdispatch.dylib`_dispatch_root_queue_drain + 1420
  • frame #12: 0x000000010a175561 libdispatch.dylib`_dispatch_worker_thread3 + 111
  • frame #13: 0x000000010a4be4de libsystem_pthread.dylib`_pthread_wqthread + 1129
  • frame #14: 0x000000010a4bc341 libsystem_pthread.dylib`start_wqthread + 13

Have you ever seen anything like this? It's not showing any observers or anything at this point. It was simply adding that code to my objects.

Thanks,
Jaime

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