Magento 2 Override Magento Checkout Model Cart updateItems function

[ankurkinex]

I Need to Override updateItems function from \Magento\Checkout\Model\Cart Also need to pass my custom helper class in __construct arguments . This is my __construct function of override class

namespace Vendor\Module\Model;
use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\Checkout\Model\Session;
Class Cart extends \Magento\Checkout\Model\Cart
{
public function __construct(\Magento\Framework\Event\ManagerInterface $eventManager,
                            \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
                            \Magento\Store\Model\StoreManagerInterface $storeManager,
                            \Magento\Checkout\Model\ResourceModel\Cart $resourceCart, Session $checkoutSession, \Magento\Customer\Model\Session $customerSession, \Magento\Framework\Message\ManagerInterface $messageManager, \Magento\CatalogInventory\Api\StockRegistryInterface $stockRegistry, \Magento\CatalogInventory\Api\StockStateInterface $stockState, \Magento\Quote\Api\CartRepositoryInterface $quoteRepository, ProductRepositoryInterface $productRepository,
                            \Vendor\Module\Helper\Data $helper, array $data = []
                            )
{
    $this->helper = $helper;
    parent::__construct($eventManager, $scopeConfig, $storeManager, $resourceCart, $checkoutSession, $customerSession, $messageManager, $stockRegistry, $stockState, $quoteRepository, $productRepository, $data);

}
}

After this i run setup:upgrade,compile, static content deploy commands. Also remove all folders in var. But when i pass the argument in __construct function. It is not working. It displays blank page. When i remove my arguments from __construct function. then page is loading.

[Manish Mittal]

Hello @ankurkinex

Try this,

/**
* @param \Magento\Core\Helper\Data $helper
*/

public function __construct(\Magento\Core\Helper\Data $helper)
{
$this->helper = $helper;

}

Issue solved, Please kudos and Accept as Solution. Cheers coding

[Manish Mittal]

Hello @ankurkinex

For more details, please follow:

https://alanstorm.com/instantiating-and-injecting-helpers-in-magento-2/

Kudos and Accept Solution. Cheers coding

[ankurkinex]

I want to pass my module helper. It is causing issue.

[Manish Mittal]

Try below shared code:

use \Module_Namespace\Module_Name\Helper\Data;

public function __construct(Data $helper) {

               $this->helper = $helper;

       }

Kudos and Accept as a solution, if it work. Cheers coding

[ankurkinex]

@Manish Mittal

I tried this but still showing blank page. here is my code. please check.

namespace Vendor\Module\Model;
use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\Checkout\Model\Session;

Class Cart extends \Magento\Checkout\Model\Cart
{

    /**
     * @var \Vendor\Module\Helper\Data
     */
   private $helper;

    public function __construct(\Vendor\Module\Helper\Data $helper)
    {
        $this->helper = $helper;
    }

    public function updateItems($data)
    {
        foreach($data as $itemId=>$cartdetails)
        {

            $item = $this->_checkoutSession->getQuote()->getItemById($itemId);
            $product = $item->getProduct();
            $productid = $product->getId();
           // $productdetails = $this->productRepository->getById($productid);
            if(array_key_exists('warranty',$cartdetails))
            {
             //  $this->helper->CartUpdateCustomOption($itemId,$productid,$cartdetails['warranty']);
            }
        }
        return parent::updateItems($data); // TODO: Change the autogenerated stub
    }
}

[Manish Mittal]

Hello @ankurkinex

Still, you are using same "\Vendor\Module\Helper\Data $helper", Please remove this and use what I shared with you. 

[ankurkinex]

@Manish Mittal

This?

Try this,

/**
* @param \Magento\Core\Helper\Data $helper
*/

public function __construct(\Magento\Core\Helper\Data $helper)
{
$this->helper = $helper;

}

[Manish Mittal]

Yes if you want to use core helper then use this or if you want your custom helper then use other custom helpers which I shared in conversation.

[Rakesh Jesadiya]

You need to add parent class __construct() classname in your PHP file to use your custom helper in your PHP file,

Use below code,

<?php
namespace Vendor\Module\Model;

use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\Checkout\Model\Session;

Class Cart extends \Magento\Checkout\Model\Cart
{

    /**
     * @var \Vendor\Module\Helper\Data
     */
    private $helper;

    public function __construct(
        \Magento\Framework\Event\ManagerInterface $eventManager,
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Checkout\Model\ResourceModel\Cart $resourceCart,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Framework\Message\ManagerInterface $messageManager,
        \Magento\CatalogInventory\Api\StockRegistryInterface $stockRegistry,
        \Magento\CatalogInventory\Api\StockStateInterface $stockState,
        \Magento\Quote\Api\CartRepositoryInterface $quoteRepository,
        ProductRepositoryInterface $productRepository,
        \Vendor\Module\Helper\Data $helper,
        array $data = []
    ) {
        $this->helper = $helper;
        parent::__construct($eventManager,$scopeConfig,$storeManager,$resourceCart,$customerSession,$messageManager,$stockRegistry,$stockState,$quoteRepository,$productRepository,$data);
    }

    public function updateItems($data)
    {
        foreach($data as $itemId=>$cartdetails)
        {

            $item = $this->_checkoutSession->getQuote()->getItemById($itemId);
            $product = $item->getProduct();
            $productid = $product->getId();
           // $productdetails = $this->productRepository->getById($productid);
            if(array_key_exists('warranty',$cartdetails))
            {
             //  $this->helper->CartUpdateCustomOption($itemId,$productid,$cartdetails['warranty']);
            }
        }
        return parent::updateItems($data); // TODO: Change the autogenerated stub
    }
}

Run php bin/magento setup:di:compile command and check.