how to pass parent record to relation manager bulkaction

BulkAction::make('Marquer comme réussi')
  ->color('info')
  ->deselectRecordsAfterCompletion()
  ->visible()
  ->action(function ($records) {
      foreach ($records as $record) {
           $record->update(['cert_code' => bin2hex(random_bytes(4))]);
       }
})