Update all quote items with qty 1 in magento2

Question

I am trying to update all the quote item qty as soon as we navigated to the cart page.

by using below code.

$quote = $this->checkoutSession->getQuote();
$quoteItems = $quote->getAllVisibleItems();
                foreach($quoteItems as $item) {
                        $productSku = $item->getSku();
                        $item->setQty(1);
                        $item->save();
                }

The above code working fine if we run from the script for or from any of the controller file.

I am looking for code to implement in event and observers,

Is there any event for this, once navigated to cart page i need update qty for each item as 1.

Can anyone suggest which event is worth for it.

Thanks

Answer 1

You can use the Controller dispatch event of Cart page controller_action_predispatch_checkout_cart_index.

On this event fire an observer and update the Cart Qty.

Observer

<?php

namespace StackExchange\Magento\Observer\CheckoutCart;
use Magento\Checkout\Model\Session as CheckoutSession;
use Magento\Framework\Exception\LocalizedException;

class UpdateQty implements \Magento\Framework\Event\ObserverInterface
 {
    /**
     * @var \Magento\Quote\Api\CartRepositoryInterface
     */
    protected $quoteRepository;
    /**
     * @var CheckoutSession
     */
    private $checkoutSession;
    /**
     * @var \Psr\Log\LoggerInterface
     */
    private $logger;

    public function __construct(
     \Psr\Log\LoggerInterface $logger,
     CheckoutSession $checkoutSession,
     \Magento\Quote\Api\CartRepositoryInterface $quoteRepository

    ) {
        $this->checkoutSession = $checkoutSession;
        $this->logger = $logger;
    }
    /**
     * Execute observer
     *
     * @param \Magento\Framework\Event\Observer $observer
     * @return void
     */
    public function execute(
        \Magento\Framework\Event\Observer $observer
    ) {
        $this->logger->debug(__METHOD__);
        $quote = $this->checkoutSession->getQuote();
        $quoteItems = $quote->getAllVisibleItems();
        if(!count($quoteItems) <= 0){
            return  $this;
        }
        try {

            foreach($quoteItems as $item) {
                    $productSku = $item->getSku();
                    $item->setQty(1);
                    $item->save();
            }
           $this->quoteRepository->save($quote); 
        } catch (LocalizedException $e) {
            $this->logger->critical($e->getMessage());
        } catch (\Exception $e) {
            $this->logger->critical($e->getMessage());
        }

    }

}