I want to set custom price programmatically to the product Magento 2

Question

I want to set the custom price for the product programmatically.In my current code , the customer create programmatically and set the products to the newly created customer.But i want set all product with the custom price. My code is working properly with the default product price but i want set the products with the custom price.Please see my code.

<?php
/**
 *
 * Copyright © 2015 Detailcommerce. All rights reserved.
 */
namespace Mp\Accountmanager\Controller\Accountmanager;

class Amsave extends \Magento\Framework\App\Action\Action
{
    protected $_messageManager;
    protected $cart;
    protected $product;
    protected $resultPageFactory;
    protected $customerRepositoryInterface;
    protected $quoteModel;
    protected $productRepository;
    protected $cartManagementInterface;
    protected $cartRepositoryInterface;
    protected $storeManager;

    public function __construct(
        \Magento\Framework\App\Action\Context $context, 
        \Magento\Framework\Message\ManagerInterface $messageManager,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory,
        \Magento\Customer\Api\CustomerRepositoryInterface $customerRepositoryInterface,
        \Magento\Quote\Model\Quote $quoteModel,
         \Magento\Quote\Api\CartManagementInterface $cartManagementInterface,
         \Magento\Quote\Api\CartRepositoryInterface $cartRepositoryInterface,
        \Magento\Catalog\Api\ProductRepositoryInterface $productRepository,
        \Magento\Catalog\Model\Product $product,
        \Magento\Checkout\Model\Cart $cart) {
        parent::__construct($context);
        $this->_messageManager = $messageManager;
        $this->storeManager = $storeManager;
        $this->resultPageFactory = $resultPageFactory;
        $this->cart = $cart;
        $this->_customerRepositoryInterface = $customerRepositoryInterface;
        $this->cartManagementInterface = $cartManagementInterface;
        $this->quoteModel = $quoteModel;
        $this->cartRepositoryInterface = $cartRepositoryInterface;
        $this->productRepository = $productRepository;
        $this->product = $product;
    }
    public function execute()
    {
        $post = $this->getRequest()->getParams();

        $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
        $storeManager = $objectManager->get('\Magento\Store\Model\StoreManagerInterface');
        $state = $objectManager->get('\Magento\Framework\App\State');

        $customerFactory = $objectManager->get('\Magento\Customer\Model\CustomerFactory');

        $websiteId = $storeManager->getWebsite()->getWebsiteId();

        $store = $storeManager->getStore();  // Get Store ID

        $storeId = $store->getStoreId();

        $customer = $objectManager->create('Mp\Accountmanager\Model\Accountmanager');





                    $cartId = $this->cartManagementInterface->createEmptyCart(); //Create empty cart
                    $quote = $this->cartRepositoryInterface->get($cartId); // load empty cart quote
                    $quote->setStoreId($this->storeManager->getStore()->getId());
                    $customer= $this->_customerRepositoryInterface->getById($customer_new->getId());
                    $quote->setCurrency();
                    $quote->assignCustomer($customer);

                    if($customerSession->getProcuctIdsSm() != NULL)
                    {
                    $products_array = $customerSession->getProcuctIdsSm();
                    $products_array = explode(',', $products_array);
                    }
                    $qty = 1;
                    $params = array();
                    foreach ($products_array as $value) 
                                 {

                     $params['qty'] = 1;//product quantity
                      $params['price'] = 153;//product price   
                    $_product = $this->productRepository->getById($value);    
                    $quote->addProduct($_product,$params);    
                    }

                    $quote->collectTotals()->save();


            $this->messageManager->addSuccessMessage(__("Please check your inbox..."));

    $this->_redirect('checkout/cart');
}
}

When i use this code i got the error like "We found an invalid request for adding product to quote."

Please help me....Thanks!!!

Answer 1

Try the following code to update price

    foreach ($products_array as $value) {
        $params['qty'] = 1;//product quantity
        $_product = $this->productRepository->getById($value);
        $_product->setPrice(153);
        $_product->setBasePrice(153);
        $quote->addProduct($_product,$params); 
    }                   

Answer 2

You can achieve this with the observer.

First create events.xml file in folder ‘test/Hello/etc/frontend’ and use event ‘checkout_cart_product_add_after’.

<?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="customprice" instance="test\Hello\Observer\CustomPrice" />
    </event>
</config>

Now create CustomPrice.php file in Observer folder.

    <?php
        /**
         * test Hello CustomPrice Observer
         *
         * @category    test
         * @package     test_Hello
         * @author      test 
         *
         */
        namespace test\Hello\Observer;

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

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

      $reqeustParams = $this->_request->getParams();
        $customproducttype = $reqeustParams['custom_product_type'];
if($customproducttype == "custom_product_type"){
                $item = $observer->getEvent()->getData('quote_item');         
                $item = ( $item->getParentItem() ? $item->getParentItem() : $item );
                $price = 100; //set your price here
                $item->setCustomPrice($price);
                $item->setOriginalCustomPrice($price);
                $item->getProduct()->setIsSuperMode(true);
            }

        }
}

You can pass some custom parameter while adding the product to the cart.

$params['qty'] = 1;//product quantity
$params['custom_product_type'] = "test" ;//product price   
$_product = $this->productRepository->getById($value);  

Answer 3

You need to add $item->save(); after $item->getProduct()->setIsSuperMode(true);