|ReleasedLast Release||Dec 2014|
Maintained by Unclaimed.
TPMigrationManager class provides easy way for
There are two migration ways.
'Inferred mapping model migration' is an easy and fast migration way. You can use this way with migrateByInferredMappingModelWithOptions:completed: method.
Fot this way, you don't need to prepare any migration model. CoreData framework checks the differences between old and new model and tries to migrate automatically. It is Apple's recommendation. If model is not changed so much, you should use this way. For this migration way, you cannot terminate the migration process by cancel method and migrationProgress property is not changed at all.
'Specific mapping model migration' is a flexible migration way. You can use this way with migrateBySpecificMappingModelWithOptions:progress:completed: method.
With this way, you can convert any old model to new one by offering specific migration model by yourself. You can terminate the migration process anytime by cancel method, and migrationProgress property will be updated periodically.
Before starting migration, you should use migrationStatus for checking which migration way you can use in your environment.
During migration, temporary persistent store file is
created and the file is used for migration. After
migration completed, the temporary persistent overwites old
one. If migration is terminated by cancel method or failed
by error, old persistent remains as it is. If you'd like
to remain old persistent file, you can specify
option in migration method.
After completing the migration, the existing persistent
store is replaced to new one regardless of whether you use
option or not. If you already have a
NSManagedObjectContext object which is dedicated to old
persistent store, you have to recreate it for new store.
iOS 5 and above. You have to enable ARC.
Copy TPMigrationManager.h and TPMigrationManager.m in TPMigrationManager directory to your project.
See API document.
Copyright (c) 2013-2014 MIYOKAWA, Nobuyoshi (http://www.tempus.org/)
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