3. Managed Object Model Migration
Anyone who has never made a mistake has never tried anything new.
Albert Einstein
In Chapter 2, “Managed Object Model Basics,” the fundamentals of managed object models were introduced, yet you were constrained to just one entity and a few attributes. The next logical step is to add more to the model; however, this requires a number of preliminary steps in order to prevent crashes caused by these changes. This chapter will show how to add model versions and model mappings, as well as demonstrate different migration techniques you can choose when upgrading a model.
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