Delete CoreData store file in the event of a model mismatch

gistfile1.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  ...
  // Get the path for our model (in this case it's named 'cache')
  NSURL *url = [[NSBundle mainBundle] URLForResource:@"cache" withExtension:@"momd"];
  NSPersistentStoreCoordinator *psc = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[[NSManagedObjectModel alloc] initWithContentsOfURL:url]]; /* get a coordinator */
  NSString *sourceStoreType = nil;/* type for the source store, or nil if not known */ ;
  NSString *path = [NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES) firstObject];
  // Figure out the full path where our store is located
  path = [path stringByAppendingFormat:@"/%@/Cache", [[[[NSBundle mainBundle] bundleIdentifier] componentsSeparatedByString:@"."] lastObject]];
  NSURL *sourceStoreURL = [NSURL fileURLWithPath:path]; /* URL for the source store */ ;
  NSError *error = nil;
  
  NSDictionary *sourceMetadata = [NSPersistentStoreCoordinator metadataForPersistentStoreOfType:sourceStoreType
                                                                                            URL:sourceStoreURL
                                                                                          error:&error];
  
  if (sourceMetadata == nil) {
    NSLog(@"Error checking migration validity");
  } else {
    if (![[psc managedObjectModel] isConfiguration:nil compatibleWithStoreMetadata:sourceMetadata]) {
      // A migration is needed.
      // Delete CoreData store
      NSFileManager *manager = [NSFileManager defaultManager];
      NSArray *paths = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES);
      NSString *directory = [[paths lastObject] stringByAppendingPathComponent:[[[[NSBundle mainBundle] bundleIdentifier] componentsSeparatedByString:@"."] lastObject]];
      NSArray *files = [manager contentsOfDirectoryAtPath:directory error:nil];
      NSError *error;
      for(NSString *filename in files) {
        [manager removeItemAtPath:[directory stringByAppendingPathComponent:filename] error:&error];
        if(error) {
          // handle error
        }
      }
    }
  }
  ...
}