As iOS developers, we often build apps that store data persistently. Core Data is Apple's powerful framework for managing object graphs and persisting them to disk. It's a fantastic tool, but like any data persistence solution, it comes with a challenge: schema evolution. What happens when your app's data model changes after users have already started storing data with an older version of your app?
This is where Core Data migration comes into play. If you simply change your data model without telling Core Data how to handle the existing data,…
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