I'm having a problem trying to upgrade an existing store of a Core
Data database to a newer model that simply has 1 additional attribute
property in an entity. This is not a document based app. Also, not
sure if this is significant, but the xcdatamodel and all related files
are stored in a framework.
First off, the code for setting my store URL is the following (hope
this is readable):
_objectModel = [NSManagedObjectModel mergedModelFromBundles:[NSArray
arrayWithObject:[NSBundle bundleForClass:[self class]]]];
_dataStoreCoordinator = [[NSPersistentStoreCoordinator alloc]
initWithManagedObjectModel:_objectModel];
BOOL newDatabase = NO;
_storeURL = [storeURL retain];
if([[NSFileManager defaultManager] fileExistsAtPath:[storeURL path]]
== NO)
{
newDatabase = YES;
}
NSError* error = nil;
NSDictionary *optionsDictionary =[NSDictionary dictionaryWithObject:
[NSNumber numberWithBool:YES]
forKey:NSMigratePersistentStoresAutomaticallyOption];
[_dataStoreCoordinator addPersistentStoreWithType:NSXMLStoreType
configuration:nil
URL:_storeURL
options:optionsDictionary
error:&error];
if(error)
{
NSLog(@"Error while adding persistent store: %@",error);
}
_context = [[NSManagedObjectContext alloc] init];
[_context setPersistentStoreCoordinator:_dataStoreCoordinator];
_dataStore = [_dataStoreCoordinator persistentStoreForURL:_storeURL];
_loaded = YES;
if(newDatabase)
{
[_context save:&error];
}
I tried to go about this two different ways. One was was to include
only the newer model file and the mapping file to the build. However,
the error I get is:
Error while adding persistent store: Error Domain=NSCocoaErrorDomain
Code=134140 UserInfo=0x3c9030 "Persistent store migration failed,
missing mapping model."
However, when I include all three files (both model and the mapping),
it seems like it's trying to merge the two and ignore the mapping file
altogether. The error I get is:
*** Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: 'Can't merge models with two
different entities named 'SomePrivateEntityName''
At first I thought it might have been the first line in my code that's
trying to do the merging. However, when I try to initialize the
ManagedObjectModel with [[NSManagedObjectModel alloc]
initWithContentsOfURL:[NSURL URLWithString:@"thePath"]], it gives me
the following error:
*** Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: 'Cannot create an
NSPersistentStoreCoordinator with a nil model'
I'm about 85% sure I specified the path right, but not sure if that'll
actually fix my problem.
Any guidance or suggestions would be appreciated.
Thanks,
Vadim Lozko
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