On 2009 Mar 13, at 01:44, Ben Trumbull wrote:
-validateForDelete: is ... not intended to double as -canDelete or - isDeleteable.
When I first started using Core Data I had the mistaken impression that the various -[NSManagedObject validateXXXX] methods were hooks into which I could place my validation code or "business logic", and things would "just work". But after playing with it for awhile, all I was able to get was sheets dropping over my document windows when I tried to save, saying stuff like "The document could not be saved. Multiple validation errors occurred."
I didn't think my users would appreciate those sheets any more than I did :O So, instead I do all my validation and model adjustments elsewhere, in custom setters or in response to notifications.
I don't believe that the -[NSManagedObject validateXXXX] methods have much use to the application programmer.
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