how to get child item object while adding to cart?

Question

I wanna put customize the code with qty while adding to cart product. For that I have created Plugin Magento\Quote\Model\Quote\Item and used addQty() method,but in this method I call quoteItem object. Below code working fine for simple product,but for configurable product it is not working.

Below I have created two files to customize code. I have created one plugin. Here is di.xml file code

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Quote\Model\Quote\Item">
        <plugin name="test_customizationquote_item" type="Test\CustomizationQuote\Plugin\Model\Quote\Item" sortOrder="10"/>
    </type>
</config>

workflow

At front store, when I select color of configurable product and click to add to cart button. It comes in addQty() method with requested qty. In this function I call quoteItem object,but this quoteItem object get parent item object or data rather than get child item. My goal is when before add to cart item, I need to check quantity of item,but quoteItem object fetch parent item object so I am unable to fetch child item stock qty. So How can I get child product object in addQty() function.

I have written addQty() function in below code. please check it

Then Here is my plugin code Item.php

<?php

namespace Test\CustomizationQuote\Plugin\Model\Quote;

use Magento\Framework\Registry;
use Magento\CatalogInventory\Api\StockRegistryInterface;
use Magento\Quote\Model\Quote\Item as QuoteItem;
use Magento\CatalogInventory\Model\Stock;

class Item
{
    /**
     * @var Registry
     */
    private $registry;

    /**
     * @var StockRegistryInterface
     */
    private $stockRegistry;

    /**
     * @param Registry $registry
     * @param StockRegistryInterface $stockRegistry
     */
    public function __construct(
        Registry $registry,
        StockRegistryInterface $stockRegistry
    ) {
        $this->registry = $registry;
        $this->stockRegistry = $stockRegistry;
    }

    public function beforeAddQty(QuoteItem $quoteItem, $qty)
    {
        $product = $quoteItem->getProduct(); // here I am getting configurable product object instead of child product object
        $stockItem = $this->stockRegistry->getStockItem($product->getId(), $product->getStore()->getWebsiteId());


        return [$qty];
    }
}

Answer 1

I suggest you try this:

$stockItem = $this->stockRegistry->getStockItem($product->getSku(), $product->getStore()->getWebsiteId());