How do I delete all objects from my persistent store in Core Data?

Question

Hi all, I have Core Data working in my app. So, I fetch an XML file, parse the data into model objects and insert them into core data. They are saved in the persistent store and I can access them when I relaunch the app. However, I want to be able to refresh the data in the persistent store at will, so I need to first remove existing objects from the store. Is there a straight-forward method for this?

Thanks

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I found this solution:

[managedObjectContext lock];
[managedObjectContext reset];//to drop pending changes
if ([persistentStoreCoordinator removePersistentStore:persistentStore error:&error])
{
NSURL* storeURL = [NSURL fileURLWithPath:[self pathForPersistentStore]];
[[NSFileManager defaultManager] removeFileAtPath:[storeURL path] handler:nil];
[self addPersistentStore];//recreates the persistent store
}
[managedObjectContext unlock];

Answer 1

You could loop through all objects and delete them by doing this:

[managedObjectContext deleteObject:someObject];

If you want to remove all objects it is probably fastest to delete the store and then recreate the CoreData stack.

Answer 2

The fastest way to ditch everything is to send your managed object context the reset message.

Answer 3

Trash your data file and remake it.