Magento 2: Changing Price of Product in Controller doesn't work at the moment!

Question

I tried to change the Price of my Products like this:

Controller.php:

[EDIT]

   <?php

namespace MassiveArt\ShoppingCart\Controller\Index;

use Magento\Catalog\Model\ProductFactory;
use Magento\Checkout\Model\Cart;
use Magento\Framework\App\Action\Action;
use Magento\Framework\App\Action\Context;
use Magento\Framework\Controller\Result\JsonFactory;
use Magento\Framework\Data\Form\FormKey;

class Index extends Action
{
    /**
     * @var FormKey
     */
    protected $formKey;

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

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

    /**
     * @var ProductFactory
     */
    protected $productFactory;

    /**
     * Constructor.
     *
     * @param Context                         $context
     * @param \Magento\Checkout\Model\Session $checkoutSession
     * @param \Magento\Customer\Model\Session $customerSession
     * @param JsonFactory                     $resultJsonFactory
     * @param FormKey                         $formKey
     * @param Cart                            $cart
     * @param ProductFactory                  $productFactory
     */
    public function __construct(
        Context $context,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Customer\Model\Session $customerSession,
        JsonFactory $resultJsonFactory,
        FormKey $formKey,
        Cart $cart,
        ProductFactory $productFactory
    ) {
        $this->checkoutSession = $checkoutSession;
        $this->customerSession = $customerSession;
        $this->formKey = $formKey;
        $this->resultJsonFactory = $resultJsonFactory;
        $this->cart = $cart;
        $this->productFactory = $productFactory;
        parent::__construct($context);
    }

    public function execute()
    {
        try {

            // Set result data and pass back
            $result = $this->resultJsonFactory->create();


            $allItems = $this->checkoutSession->getQuote()->getAllVisibleItems();
            foreach ($allItems as $item) {
                $item = ( $item->getParentItem() ? $item->getParentItem() : $item );
                $price = 100; //set your price here
                $item->setCustomPrice($price);
                $item->setOriginalCustomPrice($price);
                $item->setSubtotal($price);
                $item->getProduct()->setIsSuperMode(true);
            }
            $this->checkoutSession->setTotalsCollectedFlag(false);
            $this->checkoutSession->getQuote()->save();
            $this->checkoutSession->getQuote()->setTotalsCollectedFlag(false);
            $this->setTotalsCollectedFlag(false);

            $result->setData(['message' => __("Products added succesfully")]);

            return $result;
        } catch (\Exception $e) {
            $result->setData(['error' => __($e->getMessage())]);
            return $result;
        }
    }
}

(EDIT) With the new code the price changes, but the subtotal not! As you can see here:

Thanks in advance!

Answer 1

I get it, I think you are in the right way, but I think you have to save the quote. If you take a look on this class : \Magento\Checkout\Controller\Cart\Add you can see at Line 114 :

$this->cart->addProduct($product, $params);
            if (!empty($related)) {
                $this->cart->addProductsByIds(explode(',', $related));
            }

            $this->cart->save();

I change the price from the event which is called at the end of the addProduct() method, and Magento saves the cart at the end. So in your case, you have to save the quote in your controller.

Answer 2

I did a snippet which allows you to change the price. Actually, it changes the price after you add product in your basket. In other words, it changes the prices of your items in your quote. https://gist.github.com/0-Sony/d9d2ea792b5533bfeaff28827e6f207a

Hope it helps.

Answer 3

You want to update the row total and not the subtotal, use method $item->setRowTotal() or $item->setBaseRowTotal(). Also, it might help to add $item->save() before the end of the loop.

Subtotal is the order/cart subtotal.

Answer 4

@felix,You need to set setSubtotal() for a quote. Set Subtotal outside for loop.

$subTotal = $cart->getQuote()->setSubtotal($price);
$this->checkoutSession->getQuote()->save();

like this

foreach ($allItems as $item) {
                $item = ( $item->getParentItem() ? $item->getParentItem() : $item );
                $price = 100; //set your price here
                $item->setCustomPrice($price);
                $item->setOriginalCustomPrice($price);
                $item->getProduct()->setIsSuperMode(true);
            }
            $subtotalprice=100;
            $subTotal = $cart->getQuote()->setSubtotal($subtotalprice);
            $this->checkoutSession->setTotalsCollectedFlag(false);
            $this->checkoutSession->getQuote()->save();

Note: Code Tested

Answer 5

For Upadate cart price you have to use Model cart instead checkout session. Load item from cart and update it.

<?php 
$items = $this->cart->getQuote()->getAllItems(); //Magento\Checkout\Model\Cart $cart
foreach($items as $item) {

    $item = $this->cart->getQuote()->getItemById($item->getId());
    if (!$item) {
      continue;
    }

    $price = 100;
    $item->setCustomPrice($price);
    $item->setOriginalCustomPrice($price);
    $item->getProduct()->setIsSuperMode(true);
    $item->save();           
}
$this->cart->save();
?>

Answer 6

Try below code:

you need to modify process() function for your requirement.

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

/**
     * Quote item discount calculation process
     *
     * @param AbstractItem $item
     * @return $this
     */
    public function process(AbstractItem $item)
    {
        $item->setDiscountAmount(0);
        $item->setBaseDiscountAmount(0);
        $item->setDiscountPercent(0);
        $itemPrice = $this->getItemPrice($item);
        if ($itemPrice < 0) {
            return $this;
        }

        $appliedRuleIds = $this->rulesApplier->applyRules(
            $item,
            $this->_getRules($item->getAddress()),
            $this->_skipActionsValidation,
            $this->getCouponCode()
        );
        $this->rulesApplier->setAppliedRuleIds($item, $appliedRuleIds);
        /*Your custom code START here*/
        $item = ( $item->getParentItem() ? $item->getParentItem() : $item );
        $price = 499; //set your price here
        $item->setCustomPrice($price);
        $item->setOriginalCustomPrice($price);
        $item->getProduct()->setIsSuperMode(true);
        //echo "sku: ".$item->getSku()."=== Name: ".$item->getName();die;
        /* Your custom code END here */
        return $this;
    }

NOTE: Don't modify magento core files. Create plugin for this.

I hope it will help...!!!