/**
  * Save the grid.
  *
  * @param GridBuilder $builder
  * @param array       $items
  */
 public function save(GridBuilder $builder, array $items = [])
 {
     $model = $builder->getGridModel();
     $items = $items ?: $builder->getRequestValue('items');
     foreach ($items as $index => $item) {
         /* @var EloquentModel $entry */
         $entry = $model->find($item['id']);
         $entry->{$builder->getGridOption('sort_column', 'sort_order')} = $index + 1;
         $entry->save();
     }
 }