Well that was too easy. I even started off on the right track
yesterday before getting derailed.
This'll work:
- (id)initWithContentsOfURL:(NSURL *)absoluteURL ofType:(NSString
*)typeName error:(NSError **)outError
{
// Migrate? Optional, but it'd be good to check here if this
upgrade needs to happen.
NSError *error = nil;
NSURL *momURL = [NSURL fileURLWithPath:[MyDocument
pathForModelNamed:@"MyDocument 3"]];
NSManagedObjectModel *newMoM = [[NSManagedObjectModel alloc]
initWithContentsOfURL:momURL];
NSPersistentStoreCoordinator *psc =
[[NSPersistentStoreCoordinator alloc]
initWithManagedObjectModel:newMoM];
NSDictionary *optionsDictionary =
[NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES]
forKey:NSMigratePersistentStoresAutomaticallyOption];
id store = [psc addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:absoluteURL
options:optionsDictionary
error:&error];
if (nil == store) {
[[NSApplication sharedApplication] presentError:error];
}
// Migration has happened.
[psc release];
[newMoM release];
self = [super initWithContentsOfURL:absoluteURL ofType:typeName
error:outError];
return self;
}
This uses a pathForModelNamed method I ripped from Apple's MigrationV2
sample. It just hunts down the model's .mom file. "MyDocument 3" is
the latest version of the model.
The first section does the migration and leaves the original file
upgraded. Then, as normal, we call super to actually load the file.
There's no need to override configurePersistentStoreCoordinatorForURL
at all. I'll add some code using
isConfiguration:compatibleWithStoreMetadata: to check if the upgrade
is even needed, and that should wrap it up.
What a day.
Cheers,
Graham Perks.
http://www.asinglepixel.com
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