wordpress-mobile/WordPress-iOS — pull request #2586 by astralbodies (2014-10-15 14:29:32+00:00)
Title: Implement iterative Core Data model upgrades

Closes #2357

ContextManager has been updated to use ALIterativeMigrator when the model in the persistent store doesn't match the current model version. This allows us to create mapping models for a single version upgrade and devices installing app versions that skip upgrades will still get the mapping model applied.

Unit tested the migrations as well - I'm fairly certain this is a solid solution.