The model used to open the store is incompatible with the one used to create the store

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Deleting the app is sometimes not the case! Suggest, your app has already been published! You can’t just add new entity to the data base and go ahead – you need to perform migration!

For those who doesn’t want to dig into documentation and is searching for a quick fix:

  1. Open your .xcdatamodeld file
  2. click on Editor
  3. select Add model version…
  4. Add a new version of your model (the new group of datamodels added)
  5. select the main file, open file inspector (right-hand panel)
  6. and under Versioned core data model select your new version of data model for current data model
  7. THAT’S NOT ALL ) You should perform so called “light migration”.
  8. Go to your AppDelegate and find where the persistentStoreCoordinator is being created
  9. Find this line if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error])
  10. Replace nil options with @{NSMigratePersistentStoresAutomaticallyOption:@YES, NSInferMappingModelAutomaticallyOption:@YES} (actually provided in the commented code in that method)
  11. Here you go, have fun!

P.S. This only applies for lightweight migration. For your migration to qualify as a lightweight migration, your changes must be confined
to this narrow band:

  • Add or remove a property (attribute or relationship).
  • Make a nonoptional property optional.
  • Make an optional attribute nonoptional, as long as you provide a default value.
  • Add or remove an entity.
  • Rename a property.
  • Rename an entity.

For Swift 4

coordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: url, options: [NSMigratePersistentStoresAutomaticallyOption: true, NSInferMappingModelAutomaticallyOption: true])

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