CORE DATA MIGRATION

Core_data_migration

//in AppDelegate.m

// Add this inside NSPersistenStoreCoordinator delegate
/* Note: NSPersistenStoreCoordinator delegate is automatically created if you create
 empty application and selected "use Core Data"

*/

NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
                             [NSNumber numberWithBool:YES],
                             NSMigratePersistentStoresAutomaticallyOption,
                             [NSNumber numberWithBool:YES],
                             NSInferMappingModelAutomaticallyOption
                             ,nil];



//On the same delegate edit this:

if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType 
   configuration:nil URL:storeURL options:nil error:&error])

//into . . . .

if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType 
   configuration:nil URL:storeURL options:options error:&error])