How to remove a core data persistent store

Question

I need to delete my persistent store (doing it object by object is not practical because I have over 100,000 objects). I\'ve tried this:

- (IBAction)resetDatabas         


        

Answer 1

Here is how I do a "reset data" function in several apps:

- (void)reset {
  // Release CoreData chain
  [_managedObjectContext release];
  _managedObjectContext = nil;
  [_managedObjectModel release];
  _managedObjectModel = nil;
  [_persistentStoreCoordinator release];
  _persistentStoreCoordinator = nil;

  // Delete the sqlite file
  NSError *error = nil;
  if ([fileManager fileExistsAtPath:_storeURL.path])
    [fileManager removeItemAtURL:_storeURL error:&error];
  // handle error...
}

Basically I just release the CoreData chain, then delete the persistentStore file. That's what you are trying to do, without using removePersistentStore, which I do not care since I will just rebuild the persistentStore coordinator later. Then at next core data call the chain is rebuilt transparently using singleton-lazy-style constructors like :

- (NSManagedObjectModel *) managedObjectModel {
  if (!_managedObjectModel)
    _managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain];
  return _managedObjectModel;
}