$q = $this->xpdo->newQuery('msProduct', array('parent' => $this->get('category_id')));
  $q->select('id');
  if ($q->prepare() && $q->stmt->execute()) {
    $products = $q->stmt->fetchAll(PDO::FETCH_COLUMN);
    $productIds = implode(',', $products);
    $key = $this->getOne('Option')->get('key');
    $key = $this->xpdo->quote($key);
    if (count($products) > 0) {
      $sql = "DELETE FROM {$this->xpdo->getTableName('msProductOption')} WHERE `product_id` IN ({$productIds}) AND `key`={$key};";
      $stmt = $this->xpdo->prepare($sql);
      $stmt->execute();
      $stmt->closeCursor();
    }
  }