core data migration

Remember to clean all your targets before trying again, to avoid the can’t merge models with two different entities named ‘Person’. error

Core Data migration 설정 후에 실행했는데

"avoid the can’t merge models with two different entities named 어쩌구" 에러 났을 때.

Clean 후 다시 실행하면 된다.

참고
* http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/CoreDataVersioning/Introduction/Introduction.html
* http://www.timisted.net/blog/archive/core-data-migration/