Hướng dẫn tạo 1 Adjustments và các type khá hay của promotion Drupal 8

Hướng dẫn tạo 1 Adjustments

<?php
public function process(OrderInterface $order)
  {
    foreach ($order->getItems() as $order_item) {
      // SetAdjustment to empty initially.
      $order_item->setAdjustments([]);
      $product_variation = $order_item->getPurchasedEntity();
      $default_product_variation_id = $order_item->getPurchasedEntityId();
      if (!empty($product_variation)) {
        $product_id = $product_variation->get('product_id')
          ->getValue()[0]['target_id'];
        $product = Product::load($product_id);
        $product_type = $product->get('type')->getValue()[0]['target_id'];
        $quantity = $order_item->getQuantity();
        $product_title = $product->getTitle();
        if ($product_type == 'default') {
          $product_price = $order_item->getUnitPrice();
          $product_unit_price = $product_price->getNumber();
          if ($product_unit_price < 20 && $quantity <= 10) {
            $new_adjustment = $product_unit_price;
          }
          elseif ($product_unit_price < 20 && $quantity > 10) {
            $new_adjustment = ($product_unit_price * 10) / $quantity;
          }
          else {
            continue;
          }
          $adjustments = $order_item->getAdjustments();
          // Apply custom adjustment.
          $adjustments[] = new Adjustment([
            'type' => 'custom_adjustment',
            'label' => 'Discounted Price - ' . $product_title,
            'amount' => new Price('-' . $new_adjustment, 'USD'),
          ]);
          $order_item->setAdjustments($adjustments);
        //  $order_item->save();
          $adjustments;
        }
      }
    }
  }

Các type khá hay của promotion Drupal 8

  $promotions = $promotion_storage->loadMultiple($result);
  foreach ($promotions as $promotion) {
    $needs_save = FALSE;
    $needs_disable = FALSE;

    $conditions = $promotion->getConditions();
    $order_item_conditions = array_filter($conditions, function ($condition) {
      /** @var \Drupal\commerce\Plugin\Commerce\Condition\ConditionInterface $condition */
      return $condition->getEntityTypeId() == 'commerce_order_item' && $condition->getPluginId() != 'order_item_quantity';
    });
    $condition_map = [
      'order_item_product' => 'order_product',
      'order_item_product_type' => 'order_product_type',
      'order_item_variation_type' => 'order_variation_type',
    ];
    $condition_items = $promotion->get('conditions')->getValue();

    $known_order_item_offers = [
      'order_item_fixed_amount_off',
      'order_item_percentage_off',
    ];
    $offer = $promotion->getOffer();
    $offer_item = $promotion->get('offer')->first()->getValue();

    // Transfer order item conditions to the offer.
    if ($offer->getEntityTypeId() == 'commerce_order_item') {
      // Modify the offer item directly to be able to upgrade offers that
      // haven't yet been converted to extend OfferItemPromotionOfferBase.
      $offer_item['target_plugin_configuration']['conditions'] = [];
      foreach ($order_item_conditions as $condition) {
        $offer_item['target_plugin_configuration']['conditions'][] = [
          'plugin' => $condition->getPluginId(),
          'configuration' => $condition->getConfiguration(),
        ];
      }
      $needs_save = TRUE;
    }

    // The promotion is using a custom offer, disable it so that it can
    // get updated.
    if (!in_array($offer->getPluginId(), $known_order_item_offers)) {
      $needs_disable = TRUE;
    }

    // Convert known order item conditions to order conditions.
    if ($order_item_conditions) {
      foreach ($condition_items as $condition_item) {
        if (array_key_exists($condition_item['target_plugin_id'], $condition_map)) {
          $condition_item['target_plugin_id'] = $condition_map[$condition_item['target_plugin_id']];
          $needs_save = TRUE;
        }
      }
    }

    // Drop unknown order item conditions.
    $conditions = $promotion->getConditions();
    $order_item_conditions = array_filter($conditions, function ($condition) {
      /** @var \Drupal\commerce\Plugin\Commerce\Condition\ConditionInterface $condition */
      return $condition->getEntityTypeId() == 'commerce_order_item' && $condition->getPluginId() != 'order_item_quantity';
    });
    foreach ($order_item_conditions as $condition) {
      foreach ($condition_items as $index => $condition_item) {
        if ($condition_item['target_plugin_id'] == $condition->getPluginId()) {
          unset($condition_items[$index]);
          $needs_save = TRUE;
          // An unrecognized offer was dropped, but because the offer applies
          // to the order, wasn't transferred there. Disable the promotion
          // to allow the merchant to double check the new configuration.
          if ($offer->getEntityTypeId() == 'commerce_order') {
            $needs_disable = TRUE;
          }
        }
      }
    }

    if ($needs_disable) {
      $disabled[] = $promotion->label();
      $promotion->setEnabled(FALSE);
    }
    if ($needs_save) {
      $promotion->set('offer', $offer_item);
      $promotion->set('conditions', array_values($condition_items));
      $promotion->save();
    }
  }

  $sandbox['current_count'] = 25;
  if ($sandbox['current_count'] >= $sandbox['total_count']) {
    $sandbox['#finished'] = 1;
  }
  else {
    $sandbox['#finished'] = ($sandbox['total_count'] - $sandbox['current_count']) / $sandbox['total_count'];
  }
}

$condition = $promotion->Id()->getConditions();
        
$coupon = $order->get('coupons')->first()->get('entity')->getTarget()->getValue();