Fatal Error: 'Uncaught Error: Call to a member function setCustomPrice() on boolean magento 2.3

Question

Here i am trying to add product to the cart using customerId and productId without customer logged in, it's working fine but its not adding custom Price to that product,please guide me if you have any idea related it.

Error "Fatal Error: 'Uncaught Error: Call to a member function setCustomPrice() on boolean" because function $this->getProductQuote($product); returning false.

 <?php
    namespace Vendor\Module\Model;

    use Vendor\Module\Api\CustomerServiceInterface;
    use Magento\Catalog\Model\ResourceModel\Product\CollectionFactory as ProductCollection;
    use Magento\Catalog\Model\ProductFactory as ProductFactory;
    use Magento\Store\Model\StoreManagerInterface as StoreManager;

    class Customerservice implements CustomerServiceInterface
    {

        private $productCollection;

        private $ProductFactory;

        protected $_storeManager;

        protected $_product;

        protected $_customerserviceFactory;


        protected $_customerRepositoryInterface;

        protected $_quoteModel;


        protected $_productRepository;

        protected $_cartManagementInterface;

        protected $_cartRepositoryInterface;

        protected $_cart;

        protected $_customer;
        protected $checkoutSession;
        protected $customerSession;

        protected $formKey;   

        public function __construct(ProductCollection $productCollection,
        ProductFactory $ProductFactory,
        \Magento\Catalog\Model\Product $product,
        \Vendor\Module\Model\CustomerserviceFactory $customerserviceFactory,
        \Magento\Checkout\Model\Cart $cart,
        \Magento\Customer\Api\CustomerRepositoryInterface $customerRepositoryInterface,
        \Magento\Quote\Model\Quote $quoteModel,
        \Magento\Catalog\Api\ProductRepositoryInterface $productRepository,
        \Magento\Quote\Api\CartManagementInterface $cartManagementInterface,
        \Magento\Quote\Api\CartRepositoryInterface $cartRepositoryInterface,
        StoreManager $_storeManager,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Customer\Model\Customer $customer,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Framework\Data\Form\FormKey $formKey)
        {

            $this->productCollection = $productCollection;
            $this->ProductFactory = $ProductFactory;
            $this->_storeManager = $_storeManager;
            $this->_customerserviceFactory = $customerserviceFactory;
            $this->_product = $product;
            $this->_customerRepositoryInterface = $customerRepositoryInterface;
            $this->_quoteModel                   = $quoteModel;
            $this->_productRepository            = $productRepository;
            $this->_cartManagementInterface = $cartManagementInterface;
            $this->_cartRepositoryInterface = $cartRepositoryInterface;
            $this->_cart = $cart;
            $this->_customer = $customer;
            $this->checkoutSession = $checkoutSession;
            $this->customerSession = $customerSession;

            $this->formKey = $formKey;
        }

        public function customerservice($params) {

            $customerId = 13;
            $productId = 82;   
            $customprice = 160;
            try {

                    $params = array(
                    'form_key' => $this->formKey->getFormKey(),
                    "product" => $productId,
                    "qty" => 1,
                    "price" => $customprice
                    ); 

                    $request = new \Magento\Framework\DataObject();
                    $request->setData($params); 
                    $customerData = $this->_customerRepositoryInterface->getById($customerId);
                    $quote_data    = $this->_quoteModel->loadByCustomer($customerData);

                    if (!$quote_data->getId()) {
                        $quote_data->setCustomer($customerData); //error line here
                        //$quote_data->setIsActive(1);
                        $quote_data->setStoreId($this->_storeManager->getStore()->getId());
                    }
                    $quote_data->setCustomer($customerData);
                    //$product = $this->_productRepository->getById($productId);
                    $product = $this->ProductFactory->create()->load($productId);
                    $quote_data->addProduct($product, $request);
                    $customerEmail = $customerData->getEmail();

                    $this->_customer->setWebsiteId(1); 
                    $customer = $this->_customer->loadByEmail($customerEmail); 
                    $this->customerSession->setCustomerAsLoggedIn($customer);

                    $product = $this->ProductFactory->create()->load($productId);

                    if ($this->customerSession->isLoggedIn()) {
                        $item = $this->getProductQuote($product);
                        $item->setCustomPrice($customPrice); // setting custom price
                        $item->setOriginalCustomPrice($customPrice);
                        $item->getProduct()->setIsSuperMode(true);
                        $this->_cart->save();
                    }
                        $quote_data->collectTotals()->save(); 
                    if($this->customerSession->getId()) {
                        $this->customerSession->logout();

                    }  
                    $quote_data->collectTotals()->save(); 
                    echo json_encode("product added");
                    } catch (\Exception $ex) {
                print_r($ex->getMessage()); exit;
            }

        }

        public function getProductQuote($product) {
            $quote = $this->checkoutSession->getQuote();        
            $cartItems = $quote->getItemByProduct($product);        
            return $cartItems;
        }


    }   

Answer 1

I guess you need to check if the addProduct() is adding the product to cart.

You can also try the following way

$quoteItem = $quote_data->addProduct($product, $request);
$quoteItem->setCustomPrice($customPrice);
$quoteItem->setOriginalCustomPrice($customPrice);