Magento 2 - setCustomPrice() does not work after Quote Item Update

Question

I've been struggling with this issue for the past few weeks now.

My goal is to set a custom price for an item after I edit them on Cart.

Basically, I'm using an observer on the event checkout_cart_update_item_complete, and on that observer I eventually do the following:

$item->setCustomPrice($price);
$item->setOriginalCustomPrice($price);
$item->getProduct()->setIsSuperMode(true);
$item->save();

Where $item is the new quote item after the update (check Magento\Checkout\Controller\Cart\UpdateItemOptions.php) and $price is my custom price.

After this, the quote item price gets the value of 0, even though the custom_price field on database is actually the value that I wanted.

Any help is appreciated :)

Answer 1

Try to write your custom code under process() function.

vendor\magento\module-sales-rule\Model\Validator.php

/**
     * Quote item discount calculation process
     *
     * @param AbstractItem $item
     * @return $this
     */
    public function process(AbstractItem $item)
    {
     ..............
     ..............
     $price = 50;
     $item->setCustomPrice($price);
     $item->setOriginalCustomPrice($price);
     $item->getProduct()->setIsSuperMode(true);
     ..............
     ..............

    }

NOTE: Don't use $item->save() once and try.

I hope it help..!!