Magento – Update item custom quantity and salable quantity value after place order in Magento 2

event-observermagento2pluginsales-orderstock

I need to decrease purchased item saleable quantity with custom value (x* ordered_qty) after place order in Magento 2.Right now I'm using the following observer and class to update the quantity of purchased items.

Event Xml

    <event name="sales_order_place_after">
       <observer name="Update_customstock" instance="Company\MyMoudle\Observer\UpdateStock" />
   </event>

Observer Class

class UpdateStock implements ObserverInterface
{


    public function execute(\Magento\Framework\Event\Observer $observer)
    {

     $orderData = $observer->getEvent()->getOrder();
     $orderItems = $orderData->getAllVisibleItems();
               foreach($orderItems as $item) {
                      if($flag_variable) {
                $stockItem->setIsInStock(true);
                $stockItem->setQty($new_qty);
               $this->stockRegistry->updateStockItemBySku($item->getSku(), $stockItem);
                     }
        }
    }

}

Issue

But it's deceasing salable quantity double of my sent value and quantity also updating as sent value.

What I need

I need if the order is placed then only the decrease the salable quantity and once the shipment is created then decrease the quantity.

Please suggest any solution with a plugin or observer.

Best Answer

Use the following event global scope. Ex. VendorName/ModuleName/etc/events.xml


checkout_submit_all_after

For Paypal payment method, use the following:


paypal_express_place_order_success

Related Solutions

Is It Possible to Update Order Item Price and Total After Order is Placed

I think you can do this just like you would modify any other model instance

$item = Mage::getModel('sales/order_item')->load(id here)l
$item->setPrice(40)->setBasePrice(40)->save();

then

$order = Mage::getModel('sales/order')->load(order id here);
$order->setSubtotal(70)->setBaseSubtotal(70);
$order->setDiscountAmount(7)->setBaseDiscountAmout(7);
$order->setGrandTotal(63)->setBaseGrandTotal(63);
$order->save();

You might also need to change other values like tax, subtotal_incl_tax and others.

But this is a bad practice and you should not do it. It is better just to cancel the order and create a new one.

Magento 1.9 – How to Decrement Product Quantity After Order Placement

Finally i find out a solution for this.Below shows the function in Observer.php

public function updateQuantity($observer)
    {
        $roleId     = Mage::getSingleton('customer/session')->getCustomerGroupId();
        $userrole   = Mage::getSingleton('customer/group')->load($roleId)->getData('customer_group_code');
        $userrole   = strtolower($userrole);
        $orderId    = Mage::getSingleton('checkout/session')->getLastRealOrderId();
        $order      = Mage::getModel('sales/order')->load($orderId, 'increment_id');
        $ordered_items = $order->getAllItems();            

        if ($userrole == "retailer") {
            foreach ($ordered_items as $item) {
                //item detail                
                $orderedQty = $item->getQtyOrdered(); //ordered qty of item
                $totalQty = $item->getProduct()->getStockItem()->getQty();
                $actualQty = $totalQty + $orderedQty;
                $batchQty = $item->getProduct()->getBatchQty();
                $newQty = $actualQty-$orderedQty*$batchQty;                
                Mage::getModel('cataloginventory/stock_item')
                   ->loadByProduct($item->getProductId())
                   ->setQty($newQty)
                   ->save();
            }
        }
}

Config.xml file i have did this.

<checkout_onepage_controller_success_action>
            <observers>
                <Appmerce_MultiplesOfX_model_observer>
                    <class>Appmerce_MultiplesOfX_model_observer</class>
                    <method>updateQuantity</method>
                </Appmerce_MultiplesOfX_model_observer>
            </observers>
</checkout_onepage_controller_success_action>

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