On Aug 12, 2008, at 7:38 PM, Graham Perks wrote:
I have model versions 1, 2, and 3, 3 being the latest.
Obviously I need a mapping file to upgrade 2 -> 3.
But for upgrades of v1, should the mapping file be 1 -> 3 direct, or
1 -> 2 and Core Data will do a two-step upgrade?
Creating a mapping from 1->3 is the best option for performance
considerations, alternatively you can use a while loop that checks if
the store file is an old version and applies any available mapping to
get it to the next step.
The latter would be simplest, having Core Data automatically chain
upgrades. Is that how it's supposed to work?
No, there isn't any support for automatic chaining. It doesn't scale
particularly well.
Cheers,
Graham Perks.
http://www.asinglepixel.com
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