Using mergedModelFromBundles: and versioning (CoreData)
- by charlax
Hi everybody,
I'm trying to use the migration feature in CoreData. I've followed the Apple Documentation. I have a problem in the following method:
/**
Returns the managed object model for the application.
If the model doesn't already exist, it is created by merging all of the models found in the application bundle.
*/
- (NSManagedObjectModel *)managedObjectModel {
if (managedObjectModel != nil) {
return managedObjectModel;
}
/*
* NSInvalidArgumentException', reason: '*** -[NSCFArray insertObject:atIndex:]: attempt to insert nil'
* 2010-02-17 16:27:15.338 Patrimoine[3037:207]
*/
managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain];
return managedObjectModel;
}
It appears that there is the same problem on http://iphonedevelopment.blogspot.com/2009/09/core-data-migration-problems.html
Yet I did choose the method Apple suggests, by using the menu option "Add Model Version".
Do you have any idea?
