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in xcode 3 when you added a data model (a .xcdatamodel file) you had an option to choose existing classes to create entities from.
how do you do this in xcode 4?
i found this excellent tutorial (http://wiresareobsolete.com/wordpress/2009/12/adding-core-data-existing-iphone-projects/) which covers pretty much everything on adding core data to an existing project, the only thing that is missing (because it is from 2009) is an answer to my question..
In your datamodel click an Entity. Then go to File-> New File -> Core Data -> NSManageObject subclass.