On Sep 2, 2009, at 4:51 AM, Ian Kennedy wrote:
Hi all,
How would I go about doing a one-time migration of application data
from an xml persistent store to a sqlite persistent store? i.e. the
model stays the same, the data is migrated, and the app uses the
sqlite store from there on out.
I've been unsuccessfully trying to do it inside of the
persistentStoreCoordinator method by working with the example from
here: http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/CoreData/Articles/cdUsingPersistentStores.html
Here is what I've tried, which doesn't migrate any data, just
provides me with an empty sqlite store:
http://pastie.textmate.org/602152
NSPersistentStore *xmlStore = [persistentStoreCoordinator
persistentStoreForURL:xmlUrl];
NSPersistentStore *sqliteStore = [persistentStoreCoordinator
migratePersistentStore:xmlStore toURL:sqliteUrl options:nil
withType:NSSQLiteStoreType error:&error];
persistentStoreCoordinator = [[NSPersistentStoreCoordinator
alloc] initWithManagedObjectModel: [self managedObjectModel]];
persistentStoreCoordinator is nil when you attempt the migration.
Code defensively! You should be checking that he xmlStore is non-nil
before attempting migration, that the sqliteStore is non nil after
migration and presenting the error if one occurs.
Thanks for any help,
Ian
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