Quote item price changes

Question

Can someone suggest if there is any function to update the quote item tables price columns

(custom_price,original_custom_price,row_total,qty,price,base_price,row_total,base_row_total,price_incl_tax,base_price_incl_tax,row_total_incl_tax,base_row_total_incl_tax etc)

changes internally rather than calculating and updating each column manually?

When a product price change happens, the quote details are not changing. I was trying to add code for the same while checking out, where mini cart details were not getting updated.

Answer 1

You can update cart item price using customer login observer. While customer login the cart item will updated with new price.

app/code/Vendor/Customer/etc/frontend/events.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="customer_login">
        <observer name="vendor_customer_customer_login" instance="Vendor\Customer\Observer\CustomerloginObserver" />
    </event>
</config>

app/code/Vendor/Customer/Observer/CustomerloginObserver.php

namespace Vendor\Customer\Observer;

use Magento\Catalog\Model\Product;
use Magento\Checkout\Model\Cart;
use Magento\Checkout\Model\Session as CheckoutSession;
use Magento\Customer\Model\Address;
use Magento\Customer\Model\Customer;
use Magento\Customer\Model\Session;
use Magento\Framework\Event\ObserverInterface;
use Magento\Quote\Api\CartRepositoryInterface;
use Magento\Quote\Model\Quote\Item;

/**
 * Class CustomerloginObserver
 * 
 */
class CustomerloginObserver implements ObserverInterface {

    /**
     * @var Session
     */
    protected $customerSession;

    /**
     * @var Customer
     */
    protected $customer;

    /**
     * @var Cart
     */
    protected $cart;

    /**
     * @var CheckoutSession
     */
    protected $checkoutSession;

    /**
     * @var Product
     */
    protected $_product;

    /**
     * @var Item
     */
    protected $quoteFactory;

    /**
     * @var CartRepositoryInterface
     */
    protected $quoteRepository;

    /**
     * @var Address
     */
    protected $address;

    /**
     * CustomerloginObserver constructor.
     * @param Session $customerSession
     * @param Customer $customer
     * @param Cart $cart
     * @param CheckoutSession $checkoutSession
     * @param Product $_product
     * @param Item $quoteFactory
     * @param CartRepositoryInterface $quoteRepository
     */
    public function __construct(
        Session $customerSession,
        Customer $customer,
        Cart $cart,
        CheckoutSession $checkoutSession,
        Product $_product,
        Item $quoteFactory,
        CartRepositoryInterface $quoteRepository,
        Address $address
    ) {
        $this->customer = $customer;
        $this->customerSession = $customerSession;
        $this->cart = $cart;
        $this->address = $address;
        $this->checkoutSession = $checkoutSession;
        $this->_product = $_product;
        $this->quoteFactory = $quoteFactory;
        $this->quoteRepository = $quoteRepository;
    }

    /**
     * @param \Magento\Framework\Event\Observer $observer
     */
    public function execute(\Magento\Framework\Event\Observer $observer) {


        $id = $this->customerSession->getCustomerId();
        // check session is active or not.

        if ($session) {

            $itemId = 0;
            $qty = 0;
            $quoteId = 0;
            $sessionItems = $this->checkoutSession->getQuote()->getAllItems();

            foreach ($sessionItems as $session_item) {
                $qty = (int) $session_item['qty'];
                $productId = $session_item['product_id'];
                $product = $this->_product->load($productId);
                $setcustomprice = $this->checkoutSession->getQuote()->getItemById($session_item['item_id']);
                $uom = $product->getUom();

                    if ($price > 0) {
                        $customprice = $this->checkoutSession->getQuote()->getItemById($session_item['item_id']);
                        $customprice->setCustomPrice($price);
                        $customprice->setOriginalCustomPrice($price);
                        $customprice->save();
                        $quoteId = $session_item['quote_id'];
                    }
                }
            }

            if ($quoteId) {
                $quote = $this->quoteRepository->get($quoteId);
                $this->quoteRepository->save($quote->collectTotals());
            }
        }
}

Answer 2

First create a module using free module creator tool called silk software

Magento 2 Module Creator Tool Using Silk Software

and enable using following commands below.

 1. php bin/magento module:enable Tw_Cart
 2. php bin/magento setup:upgrade
 3. php bin/magento setup:di:compile
 4. php bin/magento setup:static-content:deploy

create events.xml in the path:- app/code/Tw/Cart/etc/frontend/events.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="checkout_cart_product_add_after">
        <observer name="Tw_Cart_Addtocart_Customprice" instance="TW\Cart\Observer\CustomPrice" />
    </event>
</config>

create CustomPrice.php in the path: app/code/Tw/Cart/Observer/ & keep the below code

<?php
    namespace TW\Cart\Observer;
    use Magento\Framework\Event\ObserverInterface;
    use Magento\Framework\App\RequestInterface;
    use Psr\Log\LoggerInterface;
    class CustomPrice implements ObserverInterface
    {

    public function execute(\Magento\Framework\Event\Observer $observer) 
    {
            $writer = new \Zend\Log\Writer\Stream(BP.'/var/log/stackexchange.log');
            $logger = new \Zend\Log\Logger();
            $logger->addWriter($writer);
            /* Code here */
            $quote_item = $observer->getEvent()->getQuoteItem();
            $price = 400; //set your price here
            $quote_item->setCustomPrice($price);
            $quote_item->setOriginalCustomPrice($price);
            $quote_item->getProduct()->setIsSuperMode(true);
            $logger->info("success !!!!");
    }

}