performCustomValidation(forMapping:manager:)
Provides the option to perform custom validation on migrated objects during the validation stage of the entity migration policy.
Declaration
func performCustomValidation(forMapping mapping: NSEntityMapping, manager: NSMigrationManager) throwsParameters
- mapping:
The mapping object in use.
- manager:
The migration manager performing the migration.
Discussion
This method is called before the default save validation is performed by the framework.
If you implement this method, you must manually obtain the collection of objects you are interested in validating.