The last time I change my Core Data schema, I had to write a custom mapping 
model and classes. The automatic migration was able to find this class and use 
it to migrate the data.

Now I've made a new change, and it's unable to migrate data from the old 
version to this latest version.

Does the migration proceed in stages? That is, does it migrate version 5 -> 7 
by first migrating 5 -> 6 and then 6 -> 7? Or do I have to add yet another 
mapping model and classes to go from 5->7?

The change from 6->7 seems to be handled automatically without problems.

-- 
Rick Mann
rm...@latencyzero.com



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