On 2014 Jul 18, at 15:54, Rick Mann <rm...@latencyzero.com> wrote:

> Is it wrong to create relationships in 
> -createDestinationInstancesForSourceInstance:…?

Yes, it is wrong, according “Three Stage Migration” of the Core Data Model 
Versioning and Data Migration Programming Guide…

https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CoreDataVersioning/Articles/vmMigrationProcess.html#//apple_ref/doc/uid/TP40004399-CH6-SW8



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