gistfile1.m

    // Grab the reference
    NSPersistentStoreCoordinator *persistentStoreCoordinator = [NSPersistentStoreCoordinator MR_defaultStoreCoordinator];
    
    // Get rid of stack reference first before deleting things or we may get a deadlock.
    [MagicalRecord cleanUp];

    // Tell persistent store coordinator to delete the stores it hangs onto
    for (NSPersistentStore *store in persistentStoreCoordinator.persistentStores) {
        NSError *error = nil;
        [persistentStoreCoordinator removePersistentStore:store error:&error];
        if (error) {
            return;
        } else {
        }
    }        
    
    // Get rid of persistent store file
    NSString *storeFilename = [MagicalRecord defaultStoreName];
    NSURL *storeFileURL = [NSPersistentStore MR_urlForStoreName:storeFilename];
    NSError *deletionError = nil;
    if ([[NSFileManager defaultManager] fileExistsAtPath:storeFileURL.path]) {
        if (![[NSFileManager defaultManager] removeItemAtURL:storeFileURL error:&deletionError]) {
            NSLog(@"Unresolved error deleting persistent store file: %@, %@", deletionError, [deletionError userInfo]);
            abort();
        }
    } else {
        DDLogError(@"There is no file at '%@'", storeFileURL);
        return;
    }

    // Re-initialize stack
    [MagicalRecord setupAutoMigratingCoreDataStack];