Handling unreadable CoreData storage

gistfile1.m

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {
    if (__persistentStoreCoordinator != nil) {
        return __persistentStoreCoordinator;
    }

    NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"database.sqlite"];
    NSError *error = nil;

    @try {
        __persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:self.managedObjectModel];
    } @catch (NSException *e) {
        NSLog(@"EXCEPTION: %@", e);
    }
    if ([__persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error] == nil) {
        NSLog(@"Deleting unreadable %@", storeURL);

        error = nil;
        [[NSFileManager defaultManager] removeItemAtURL:storeURL error:&error];
        if (error != nil) {
            NSLog(@"Unable to delete %@\n%@\n%@", storeURL, error, [error userInfo]);
            abort();
        }

        if ([self.persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error] == nil) {
            NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
            abort();
        }
    }

    return __persistentStoreCoordinator;
}