Magento 2 Cart – Add Product to Cart with Price 0 When Same Product in Cart

magento2

I'm trying add to cart a item with price 0 when I have this product added in the cart.

Example: I have in the cart the product with SKU: 0000123 with his current price: 2.00 with a new functionality of my web and now I want add the SKU: 0000123 with the price 0 but when i try add again with price 0 only modify the qty of the 1st item to 2

I have an Observer with the event checkout_cart_product_add_after

Question: How can I add the simple product with price 0 when i have the same product in the cart with his real price?

Best Answer

create events.xml on the following location.

app\code\Vendor\Extension\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="set_custom_price_after_add_to_cart" instance="Vendor\Extension\Observer\Customprice" />
    </event>
</config>

create Customprice.php on following location.

app\code\Vendor\Extension\Observer\Customprice.php

<?php

namespace Vendor\Extension\Observer;

use \Magento\Framework\Event\ObserverInterface;

class Customprice implements ObserverInterface
{
    public function execute(\Magento\Framework\Event\Observer $observer) {
        $item = $observer->getEvent()->getData('quote_item');

        // Get parent product if current product is child product
        $item = ($item->getParentItem()?$item->getParentItem():$item);

        //HERE YOU NEED TO CHECK IF PRODUCT EXIST INTO CART, THEN CHANGE PRICE OTHERWISE NOT.

        $price = 0; //Set Custom Price Here

        //Set custom price
        $item->setCustomPrice($price);
        $item->setOriginalCustomPrice($price);
        $item->getProduct()->setIsSuperMode(true);
    }
}

Related Solutions

Magento 2 – Set Custom Price of Product When Adding to Cart Code Not Working

Please use this even checkout_cart_product_add_after, and also I suggest you that

ObserverInterface has only one method which is execute, so write your code in this method.

And do not use parent Item because while you are adding to cart any item then price depend upon child item so the best way is to use directly that item object that you are getting. So best practice is to use that item itself.

And also return $this object at the end of your code inside execute method.

For eg: namespace Navin\Testcart\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\App\RequestInterface;

class CustomPrice implements ObserverInterface
{
    public function execute(\Magento\Framework\Event\Observer $observer) {

        $item=$observer->getEvent()->getData('quote_item');
        $product=$observer->getEvent()->getData('product');
        // here i am using item's product final price
        $price = $item->getProduct()->getFinalPrice()+10; // 10 is custom price. It will increase in product price.
        // Set the custom price
        $item->setCustomPrice($price);
        $item->setOriginalCustomPrice($price);
        // Enable super mode on the product.
        $item->getProduct()->setIsSuperMode(true);
        return $this;
    }

}

Hope this will help you. :)

Magento 2 – Fix Item Options Not Available Issue

Cart Quote Item Option data stored in the quote_item_option table. This table contains option_id, item_id, product_id, code and value fields.

I have to pass product_id, code and value data to the addOption function but missing to pass product_id. Refer the following code

$item = $observer->getQuoteItem();

    $additionalOptions = array();

    if ($additionalOption = $item->getOptionByCode('additional_options')){
        $additionalOptions = (array) unserialize($additionalOption->getValue());
    }

    $post = $this->_request->getParam('info');

    if(is_array($post)){
        foreach($post as $key => $value){
            if($key == '' || $value == ''){
                continue;
            }

            $additionalOptions[] = [
                'label' => $key,
                'value' => $value
            ];
        }
    }

    if(count($additionalOptions) > 0){
        $item->addOption(array(
            'product_id' => $item->getProductId(),//Missing data
            'code' => 'additional_options',
            'value' => serialize($additionalOptions)
        ));
    }

Best Answer

Related Solutions

Magento 2 – Set Custom Price of Product When Adding to Cart Code Not Working

Magento 2 – Fix Item Options Not Available Issue

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