ios - Coredata-「NSObjectInaccessibleException-CoreDataは障害を実行できませんでした」

Question

iOSアプリに問題があり、次のエラーが発生します。

“NSObjectInaccessibleException - CoreData could not fulfill a fault”

データベースを更新するとき、私は別のスレッドからそれを行い、そのスレッドにこのメソッドがあります：

@interface UpdateDatabase : NSOperation

@property (nonatomic,copy) NSString *name;

@end

@implementation UpdateDatabase

- (void)mergeChanges:(NSNotification *)notification
{
    AppDelegate *appController = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    NSManagedObjectContext *mainContext = [appController managedObjectContext];

// Merge changes into the main context on the main thread
[mainContext performSelectorOnMainThread:@selector(mergeChangesFromContextDidSaveNotification:) 
                              withObject:notification
                           waitUntilDone:YES];  
}


- (void)main {

    AppDelegate *appController = (AppDelegate *)[[UIApplication sharedApplication] delegate];

    self.managedObjectContext = [[NSManagedObjectContext alloc] init];
    [self.managedObjectContext setUndoManager:nil];
    [self.managedObjectContext setPersistentStoreCoordinator: [appController persistentStoreCoordinator]];

    // Register context with the notification center
    NSNotificationCenter *nc = [NSNotificationCenter defaultCenter]; 
    [nc addObserver:self
           selector:@selector(mergeChanges:) 
               name:NSManagedObjectContextDidSaveNotification
             object:self.managedObjectContext];

    [self checkForUpdate:self.name];

}

- (NSFetchedResultsController *)fetchedResultsController
{
    if (__fetchedResultsController != nil) {
        return __fetchedResultsController;
    }

    // Set up the fetched results controller.
    // Create the fetch request for the entity.
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    // Edit the entity name as appropriate.
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Serial" inManagedObjectContext:self.managedObjectContext];
    [fetchRequest setEntity:entity];

    // Set the batch size to a suitable number.
    [fetchRequest setFetchBatchSize:20];

    // Edit the sort key as appropriate.
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"sectionNumber" ascending:NO];
    NSArray *sortDescriptors = [NSArray arrayWithObjects:sortDescriptor, nil];

    [fetchRequest setSortDescriptors:sortDescriptors];

    // Edit the section name key path and cache name if appropriate.
    // nil for section name key path means "no sections".
    NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:@"sectionNumber" cacheName:nil];
    aFetchedResultsController.delegate = self;
    self.fetchedResultsController = aFetchedResultsController;

    NSError *error = nil;
    if (![self.fetchedResultsController performFetch:&error]) {
        /*
        Replace this implementation with code to handle the error appropriately.

        abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. 
        */
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }

    return __fetchedResultsController;
} 

- (void)checkForUpdate:(NSString *)name 
{
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];

    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Serial" inManagedObjectContext:self.managedObjectContext];

    [fetchRequest setEntity:entity];
    //Controllo prima che la serie di cui voglio fare l'aggiornamento non sia in download, e non stia facendo già un aggiornamneto (caso mai per qualche strana ragione non ne siano partiti 2), prendo solo le altre.
    [fetchRequest setPredicate:[NSPredicate predicateWithFormat:@"%K == %@", @"serialName",self.name]];
    NSError *error;

    NSArray *fetchedObjects = [self.managedObjectContext executeFetchRequest:fetchRequest error:&error];

    for (NSManagedObject *info in fetchedObjects) {
        //i update the object
    }

    if (![self.managedObjectContext save:&error]) {
        // Replace this implementation with code to handle the error appropriately.
        // abort() causes the application to generate a crash log and terminate.
        // You should not use this function in a shipping application, although it may be useful
        // during development. If it is not possible to recover from the error, display an alert
        // panel that instructs the user to quit the application by pressing the Home button.
        //
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }
}
@end

そして、コアデータデータベースのすべての要素に対して新しいnsoperationを起動し、UITableViewがあるビューで、次のようになります。

    - (NSFetchedResultsController *)fetchedResultsController
{
    if (__fetchedResultsController != nil) {
        return __fetchedResultsController;
    }

    // Set up the fetched results controller.
    // Create the fetch request for the entity.
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    // Edit the entity name as appropriate.
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Serial" inManagedObjectContext:self.managedObjectContext];
    [fetchRequest setEntity:entity];

    // Set the batch size to a suitable number.
    [fetchRequest setFetchBatchSize:20];

    // Edit the sort key as appropriate.
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"sectionNumber" ascending:NO];

    NSSortDescriptor *numberDayDescriptor = [[NSSortDescriptor alloc] initWithKey:@"numberOfDays" ascending:YES];
    NSSortDescriptor *serialNameDescriptor = [[NSSortDescriptor alloc] initWithKey:@"serialName" ascending:YES];
    NSArray *sortDescriptors = [NSArray arrayWithObjects:sortDescriptor,numberDayDescriptor,serialNameDescriptor, nil];

    [fetchRequest setSortDescriptors:sortDescriptors];

    // Edit the section name key path and cache name if appropriate.
    // nil for section name key path means "no sections".
    NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:@"sectionNumber" cacheName:@"Master"];
    aFetchedResultsController.delegate = self;
    self.fetchedResultsController = aFetchedResultsController;

    NSError *error = nil;
    if (![self.fetchedResultsController performFetch:&error]) {
        /*
        Replace this implementation with code to handle the error appropriately.

        abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. 
        */
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }

    return __fetchedResultsController;
}    

- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller
{
    [self.tableView beginUpdates];
}

- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
       atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type
{
    switch(type) {
        case NSFetchedResultsChangeInsert:
            [self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeDelete:
            [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}

- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
   atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
  newIndexPath:(NSIndexPath *)newIndexPath
{
    UITableView *tableView = self.tableView;

    switch(type) {
        case NSFetchedResultsChangeInsert:
            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeDelete:
            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeUpdate:
            [self configureCell:[tableView cellForRowAtIndexPath:indexPath] atIndexPath:indexPath];
            break;

        case NSFetchedResultsChangeMove:
            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath]withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
    [self.tableView endUpdates];
}

アプリがクラッシュする場合とクラッシュしない場合がありますが、このエラーを処理するにはどうすればよいですか？私はSOでこの問題に関するいくつかの質問を読みました、そして誰かがfetchbatchsizeとキャッシュを削除することについて話します、あなたはどう思いますか？どこが間違っているの？

編集：

コードを編集しました。