iphone - Core data problems on real device -

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i had problem in simulator - when want edit table in core data or create new table program using database fails every time start it. google problem , found solution - every time want change in tables have manually delete database. works fine nowadays license testing on real device, not know how works on real device. work company , maybe database expanding new tables, , not know how prevent in real device. admit strange problem, can me?

if change core data model during testing, can delete app simulator/device. in case xcode install new database on simulator/device when re-install app , app won't crash.

if app has been released in itunes , want change database, have implement data migration in app.

hope understood question right. please ask if have more questions.


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