检测库存变化

我需要检测产品的库存水平何时发生变化。我使用cataloginventory_stock_item_save_after事件发生了一些成功，该事件在后端更改库存或在前端取消订单（通过Paypal）时触发，但从前端购买产品时不会触发。

我cataloginventory_stock_item_save_after喜欢这样的事件：

<global>
    <events>
        <cataloginventory_stock_item_save_after>
            <observers>
                <cataloginventory_stock_item_save_after_handler>
                    <type>model</type>
                    <class>stockchange/observer</class>
                    <method>stockChange</method>
                </cataloginventory_stock_item_save_after_handler>
            </observers>
        </cataloginventory_stock_item_save_after>
    </events>

<?php
class FashionBunker_StockChange_Model_Observer {
    public function stockChange(Varien_Event_Observer $observer) {

当客户购买商品时，我是否需要使用另一个事件来捕获库存变化，或者我迷上该事件的方式是否存在问题？

一段时间以前，我为此构建了一些东西，我不得不听取多个观察者的意见，因为并非所有的观察者都由目录库存的保存来处理，因此我必须遵循以下代码：

    <events>
        <cataloginventory_stock_item_save_commit_after>
            <observers>
                <genmato_stockupdate>
                    <class>genmato_stockupdate/observer</class>
                    <method>catalogInventorySave</method>
                </genmato_stockupdate>
            </observers>
        </cataloginventory_stock_item_save_commit_after>
        <sales_model_service_quote_submit_before>
            <observers>
                <genmato_stockupdate>
                    <class>genmato_stockupdate/observer</class>
                    <method>subtractQuoteInventory</method>
                </genmato_stockupdate>
            </observers>
        </sales_model_service_quote_submit_before>
        <sales_model_service_quote_submit_failure>
            <observers>
                <genmato_stockupdate>
                    <class>genmato_stockupdate/observer</class>
                    <method>revertQuoteInventory</method>
                </genmato_stockupdate>
            </observers>
        </sales_model_service_quote_submit_failure>
        <sales_order_item_cancel>
            <observers>
                <genmato_stockupdate>
                    <class>genmato_stockupdate/observer</class>
                    <method>cancelOrderItem</method>
                </genmato_stockupdate>
            </observers>
        </sales_order_item_cancel>
        <sales_order_creditmemo_save_after>
            <observers>
                <genmato_stockupdate>
                    <class>genmato_stockupdate/observer</class>
                    <method>refundOrderInventory</method>
                </genmato_stockupdate>
            </observers>
        </sales_order_creditmemo_save_after>
    </events>

在观察者中，以下代码：

public function catalogInventorySave(Varien_Event_Observer $observer)
{
    if ($this->isEnabled()) {
        $event = $observer->getEvent();
        $_item = $event->getItem();

        if ((int)$_item->getData('qty') != (int)$_item->getOrigData('qty')) {
            $params = array();
            $params['product_id'] = $_item->getProductId();
            $params['qty'] = $_item->getQty();
            $params['qty_change'] = $_item->getQty() - $_item->getOrigData('qty');
        }
    }
}

public function subtractQuoteInventory(Varien_Event_Observer $observer)
{
    if ($this->isEnabled()) {
        $quote = $observer->getEvent()->getQuote();
        foreach ($quote->getAllItems() as $item) {
            $params = array();
            $params['product_id'] = $item->getProductId();
            $params['sku'] = $item->getSku();
            $params['qty'] = $item->getProduct()->getStockItem()->getQty();
            $params['qty_change'] = ($item->getTotalQty() * -1);
        }
    }
}

public function revertQuoteInventory(Varien_Event_Observer $observer)
{
    if ($this->isEnabled()) {
        $quote = $observer->getEvent()->getQuote();
        foreach ($quote->getAllItems() as $item) {
            $params = array();
            $params['product_id'] = $item->getProductId();
            $params['sku'] = $item->getSku();
            $params['qty'] = $item->getProduct()->getStockItem()->getQty();
            $params['qty_change'] = ($item->getTotalQty());
        }
    }
}

public function cancelOrderItem(Varien_Event_Observer $observer)
{
    if ($this->isEnabled()) {
        $item = $observer->getEvent()->getItem();
        $qty = $item->getQtyOrdered() - max($item->getQtyShipped(), $item->getQtyInvoiced()) - $item->getQtyCanceled();
        $params = array();
        $params['product_id'] = $item->getProductId();
        $params['sku'] = $item->getSku();
        $params['qty'] = $item->getProduct()->getStockItem()->getQty();
        $params['qty_change'] = $qty;
    }
}

public function refundOrderInventory(Varien_Event_Observer $observer)
{
    if ($this->isEnabled()) {
        $creditmemo = $observer->getEvent()->getCreditmemo();
        foreach ($creditmemo->getAllItems() as $item) {
            $params = array();
            $params['product_id'] = $item->getProductId();
            $params['sku'] = $item->getSku();
            $params['qty'] = $item->getProduct()->getStockItem()->getQty();
            $params['qty_change'] = ($item->getQty());
       }
    }
}

希望这是您想要的东西。

您无法使用与库存项目模型相关的任何事件，因为Magento使用优化的SQL查询来一次减少所有订购项目的库存，从而绕过该模型。

我改写了Mage_CatalogInventory_Model_Stock添加其他事件的位置来解决此问题：

<?php
/**
 * Add events to observe stock qty change
 * 
 * @author Fabian Schmengler
 *
 */
class SGH_ShippingExpress_Model_CatalogInventory_Stock
    extends Mage_CatalogInventory_Model_Stock
{
    const EVENT_CORRECT_STOCK_ITEMS_QTY_BEFORE = 'cataloginventory_stock_item_correct_qty_before';
    const EVENT_CORRECT_STOCK_ITEMS_QTY_AFTER = 'cataloginventory_stock_item_correct_qty_after';

    /**
     * (non-PHPdoc)
     * @see Mage_CatalogInventory_Model_Stock::registerProductsSale()
     */
    public function registerProductsSale($items)
    {
        Mage::dispatchEvent(self::EVENT_CORRECT_STOCK_ITEMS_QTY_BEFORE, array(
            'stock'     => $this,
            'items_obj' => (object)array('items' => &$items),
            'operator'  => '-'
        ));
        $result = parent::registerProductsSale($items);
        Mage::dispatchEvent(self::EVENT_CORRECT_STOCK_ITEMS_QTY_AFTER, array(
            'stock'          => $this,
            'items'          => $items,
            'fullsave_items' => $result,
            'operator'       => '-'
        ));
        return $result;
    }
    /**
     * (non-PHPdoc)
     * @see Mage_CatalogInventory_Model_Stock::revertProductsSale()
     */
    public function revertProductsSale($items)
    {
        Mage::dispatchEvent(self::EVENT_CORRECT_STOCK_ITEMS_QTY_BEFORE, array(
            'stock'     => $this,
            'items_obj' => (object)array('items' => &$items),
            'operator'  => '+'
        ));
        $result = parent::revertProductsSale($items);
        Mage::dispatchEvent(self::EVENT_CORRECT_STOCK_ITEMS_QTY_AFTER, array(
            'stock'          => $this,
            'items'          => $items,
            'fullsave_items' => $result,
            'operator'       => '+'
        ));
        return $result;
    }
}

然后观察者cataloginventory_stock_item_correct_qty_after可以看起来像这样：

    /**
     * @var $items array array($productId => array('qty'=>$qty, 'item'=>$stockItem))
     */
    $items = $observer->getItems();
    foreach ($items as $productId => $item) {
        $stockItem = $item['item'];
        $product = $stockItem->getProduct();

        // Do anything you need with $stockItem and $product here

    }

我建议不要进行繁重的处理或进行额外的数据库调用（例如，这对于检测产品是否缺货是必要的），而应将产品添加到由cronjob处理的队列中，以最大程度地减少额外的加载时间。用户。