How do I migrate Core Data models?

When working with Core Data in Swift, migrating your Core Data models can be a crucial step as your application's requirements evolve. Migration allows your app to adapt to changes in the model without losing existing data, ensuring backwards compatibility.

There are two main types of migration in Core Data: lightweight migration and custom migration. Lightweight migration is suitable for simple model changes, while custom migration is necessary for more complex changes that require finer control.

Here’s a basic example of how to set up a lightweight migration in Swift:

// Set up the persistent store coordinator with the options let options = [NSMigratePersistentStoresAutomaticallyOption: true, NSInferMappingModelAutomaticallyOption: true] let persistentStoreCoordinator = NSPersistentStoreCoordinator(managedObjectModel: managedObjectModel) do { try persistentStoreCoordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: storeURL, options: options) } catch { // Handle the error fatalError("Unresolved error \(error)") }

core data migration swift core data lightweight migration custom migration persistent store coordinator

Related Questions

How do I avoid rehashing overhead with std::set in multithreaded code?

How do I find elements with custom comparators with std::set for embedded targets?

How do I erase elements while iterating with std::set for embedded targets?

How do I provide stable iteration order with std::unordered_map for large datasets?

How do I reserve capacity ahead of time with std::unordered_map for large datasets?

How do I erase elements while iterating with std::unordered_map in multithreaded code?

How do I provide stable iteration order with std::map for embedded targets?

How do I provide stable iteration order with std::map in multithreaded code?

How do I avoid rehashing overhead with std::map in performance-sensitive code?

How do I merge two containers efficiently with std::map for embedded targets?