Re: CoreData issue when updating a file format
Re: CoreData issue when updating a file format
- Subject: Re: CoreData issue when updating a file format
- From: SA Dev <email@hidden>
- Date: Wed, 11 May 2005 14:01:08 -0400
Well, your argument can be applied to CoreData in general as well
- how can they know what we're going to model? They don't; they
simply provide a generic-enough system for us to use. The same
should've been done for making model versioning easier. That's the
crux of the argument.
On May 11, 2005, at 1:56 PM, James Dessart wrote:
Right, however the semantics of migrations are very application
specific. You have both models, and you try to load a file first with
the new model, if that fails you load it with the old model, then use
your application specific migration path. How can Apple know, in
advance, what data you want to migrate?
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