Question

I’m working with a Core Data project in iOS 4.1 (targeting 3.1). When I add a Data Model version I get the dreaded “Can’t merge models with two different entities named xxx” error.” Cleaning Targets does not help. Deleting the build directory does not help. The only thing that solves the issue is deleting the previously installed version of the app and installing fresh, which defeats the entire purpose of versioning and data migration.

I’ve got another project that’s successfully using this process and they share the same code libraries I’ve put together for handling Core Data. I cannot figure out what could be hanging up the one project.

I based my Core Data code on, Grouchal’s answer on this link text and Jeff Lamarche’s link text. In troubleshooting I’ve poured over these as well as other, similar articles on the net. Most people with this issue seem to have had good luck with “Clean All Targets.” But I’m striking out.

Any suggestions?

Answer 1

I discovered that a 3rd party library I was using was creating it’s own CoreData data store and was using the “merge models” method or data model management.
I contacted the vendor and the helpfully fixed the situation.