Occasionally getting wrongfully deleted objectNotifications

[roobiq]

Occasionally getting wrongfully deleted objectNotifications

[beloso]

Could this be related to #49 ?

[beloso]

[;2016-03-15 18:18:50.944 App[325:60047] *** Assertion failure in -[CYChatCollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:], /SourceCache/UIKit/UIKit-3347.44.2.2/UICollectionView.m:4072
(lldb) bt
* thread #1: tid = 0xea8f, 0x0000000196fc80a8 libobjc.A.dylib`objc_exception_throw, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x0000000196fc80a8 libobjc.A.dylib`objc_exception_throw
    frame #1: 0x00000001852fc0ec CoreFoundation`+[NSException raise:format:arguments:] + 116
    frame #2: 0x00000001861b0ed4 Foundation`-[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 112
    frame #3: 0x000000018a405a14 UIKit`-[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:] + 9932
    frame #4: 0x000000018a408828 UIKit`-[UICollectionView _performBatchUpdates:completion:invalidationContext:tentativelyForReordering:] + 352
  * frame #5: 0x00000001004e6198 App`-[UICollectionView(self=0x000000012f111000, _cmd="commitChangesWithCompletion:", completion=(CashYT`__74-[AppFetchedResultsControllerDelegator controllerDidChangeContent:]_block_invoke at CYChatViewFetchedResultsControllerDelegator.m:67)) commitChangesWithCompletion:] + 1308 at UICollectionView+NSFetchedResultsController.m:136
    frame #6: 0x000000010016bf94 App`-[AppFetchedResultsControllerDelegator controllerDidChangeContent:](self=0x0000000170234e40, _cmd="controllerDidChangeContent:", controller=0x00000001708702c0) + 292 at CYChatViewFetchedResultsControllerDelegator.m:67
    frame #7: 0x00000001004f0bc8 App`__112-[RBQFetchedResultsController calculateChangesWithAddedSafeObjects:deletedSafeObjects:changedSafeObjects:realm:]_block_invoke418(.block_descriptor=<unavailable>) + 248 at RBQFetchedResultsController.m:753
    frame #8: 0x000000010164cfd4 libdispatch.dylib`_dispatch_call_block_and_release + 24
    frame #9: 0x000000010164cf94 libdispatch.dylib`_dispatch_client_callout + 16
    frame #10: 0x0000000101651c28 libdispatch.dylib`_dispatch_main_queue_callback_4CF + 1864
    frame #11: 0x00000001852b3544 CoreFoundation`__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
    frame #12: 0x00000001852b15ec CoreFoundation`__CFRunLoopRun + 1492
    frame #13: 0x00000001851dcf74 CoreFoundation`CFRunLoopRunSpecific + 396
    frame #14: 0x000000018ec376fc GraphicsServices`GSEventRunModal + 168
    frame #15: 0x0000000189dded94 UIKit`UIApplicationMain + 1488
    frame #16: 0x00000001001bd420 App`main(argc=1, argv=0x000000016fd6f968) + 856 at main.m:41
    frame #17: 0x0000000197672a08 libdyld.dylib`start + 4
2016-03-15 18:19:40.483 App[325:60047] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of items in section 0.  The number of items contained in an existing section after the update (81) must be equal to the number of items contained in that section before the update (80), plus or minus the number of items inserted or deleted from that section (38 inserted, 32 deleted) and plus or minus the number of items moved into or out of that section (0 moved in, 0 moved out).'

Here is another crash log. it says that 32 items were deleted, while in fact only 1 was added.

[bigfish24]

@tiagoveloso that is really bizarre. I don't think it is related to #49

Can you verify all the areas that are creating a Realm transaction and calling the various notification methods for RBQRealmNotificationManager such as addObjectWithNotification:

What you can do too to debug is add your own debug block to RBQRealmNotificationManager:

[[RBQRealmNotificationManager defaultManager] addNotificationBlock:^(NSDictionary *entityChanges, RLMRealm *realm) {
    // You can inspect the entityChanges dictionary
    // The key is a string of the Realm object classname
    // The object is an instance of RBQEntityChangesObject
    RBQEntityChangesObject *objectChanges = entityChanges[@"CLASSNAME"];
    NSLog(@"Added Objects: %d", objectChanges.addedSafeObjects.count);
    NSLog(@"Deleted Objects: %d", objectChanges.deletedSafeObjects.count);
    NSLog(@"Changed Objects: %d", objectChanges.changedSafeObjects.count);
}];

If those counts are higher than 1 then your code is calling more notifications than necessary, but if not then there is a bug in RBQFRC.

[beloso]

This is weird, the notification block sees 1 added objects.

The debug log inside RBQFRC says there is 1 derived added objects.

The collection view says there are 2 added objects.

2016-03-16 12:37:52.006 App[553:308024] Added Objects:   1
2016-03-16 12:37:52.006 App[553:308024] Deleted Objects: 0
2016-03-16 12:37:52.006 App[553:308024] Changed Objects: 0
2016-03-16 12:37:52.029 App[553:308024] 0 Derived Inserted Sections
2016-03-16 12:37:52.029 App[553:308024] 0 Derived Deleted Sections
2016-03-16 12:37:52.029 App[553:308024] 1 Derived Added Objects
2016-03-16 12:37:52.029 App[553:308024] 0 Derived Deleted Objects
2016-03-16 12:37:52.030 App[553:308024] 0 Derived Moved Objects
2016-03-16 12:37:52.169 CashYT[553:307234] *** Assertion failure in -[CYChatCollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering: /SourceCache/UIKit/UIKit-3347.44.2.2/UICollectionView.m:4072
(lldb) bt
* thread #1: tid = 0x4b022, 0x0000000196fc80a8 libobjc.A.dylib`objc_exception_throw, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x0000000196fc80a8 libobjc.A.dylib`objc_exception_throw
    frame #1: 0x00000001852fc0ec CoreFoundation`+[NSException raise:format:arguments:] + 116
    frame #2: 0x00000001861b0ed4 Foundation`-[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 112
    frame #3: 0x000000018a405a14 UIKit`-[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:] + 9932
    frame #4: 0x000000018a408828 UIKit`-[UICollectionView _performBatchUpdates:completion:invalidationContext:tentativelyForReordering:] + 352
  * frame #5: 0x00000001004739b8 App`-[UICollectionView(self=0x000000014f0e7e00, _cmd="commitChangesWithCompletion:", completion=(CashYT`__74-[AppFetchedResultsControllerDelegator controllerDidChangeContent:]_block_invoke at CYChatViewFetchedResultsControllerDelegator.m:67)) commitChangesWithCompletion:] + 1308 at UICollectionView+NSFetchedResultsController.m:136
    frame #6: 0x0000000100100b8c App`-[AppFetchedResultsControllerDelegator controllerDidChangeContent:](self=0x0000000174629a60, _cmd="controllerDidChangeContent:", controller=0x0000000175876780) + 292 at CYChatViewFetchedResultsControllerDelegator.m:67
    frame #7: 0x000000010047e3e8 App`__112-[RBQFetchedResultsController calculateChangesWithAddedSafeObjects:deletedSafeObjects:changedSafeObjects:realm:]_block_invoke418(.block_descriptor=<unavailable>) + 248 at RBQFetchedResultsController.m:753
    frame #8: 0x00000001015ccfd4 libdispatch.dylib`_dispatch_call_block_and_release + 24
    frame #9: 0x00000001015ccf94 libdispatch.dylib`_dispatch_client_callout + 16
    frame #10: 0x00000001015d1c28 libdispatch.dylib`_dispatch_main_queue_callback_4CF + 1864
    frame #11: 0x00000001852b3544 CoreFoundation`__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
    frame #12: 0x00000001852b15ec CoreFoundation`__CFRunLoopRun + 1492
    frame #13: 0x00000001851dcf74 CoreFoundation`CFRunLoopRunSpecific + 396
    frame #14: 0x000000018ec376fc GraphicsServices`GSEventRunModal + 168
    frame #15: 0x0000000189dded94 UIKit`UIApplicationMain + 1488
    frame #16: 0x0000000100152018 App`main(argc=1, argv=0x000000016fddb968) + 856 at main.m:41
    frame #17: 0x0000000197672a08 libdyld.dylib`start + 4
2016-03-16 12:38:21.013 App[553:307234] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of items in section 0.  The number of items contained in an existing section after the update (659) must be equal to the number of items contained in that section before the update (658), plus or minus the number of items inserted or deleted from that section (2 inserted, 0 deleted) and plus or minus the number of items moved into or out of that section (0 moved in, 0 moved out).'
*** First throw call stack:
(0x1852fc22c 0x196fc80e4 0x1852fc0ec 0x1861b0ed4 0x18a405a14 0x18a408828 0x1004739b8 0x100100b8c 0x10047e3e8 0x1015ccfd4 0x1015ccf94 0x1015d1c28 0x1852b3544 0x1852b15ec 0x1851dcf74 0x18ec376fc 0x189dded94 0x100152018 0x197672a08)
libc++abi.dylib: terminating with uncaught exception of type NSException

[bigfish24]

@tiagoveloso can you provide the code that implements the RBQFRC delegate?

[beloso]

@bigfish24 Can I send you the sample code outside Github? Is it ok if I send you a snippet to your realm email?

[bigfish24]

@tiagoveloso feel free to email me at [email protected]

[inPhilly]

Did you find the solution for this issue?