MC-41911: Decimal quantity is converted to integer value when updated

Author: tsviklinskyi

app/code/Magento/Checkout/Controller/Cart/Add.php

@@ -6,9 +6,11 @@
  */
 namespace Magento\Checkout\Controller\Cart;
 
+use Magento\Checkout\Model\Cart\RequestQuantityProcessor;
 use Magento\Framework\App\Action\HttpPostActionInterface as HttpPostActionInterface;
 use Magento\Catalog\Api\ProductRepositoryInterface;
 use Magento\Checkout\Model\Cart as CustomerCart;
+use Magento\Framework\App\ObjectManager;
 use Magento\Framework\App\ResponseInterface;
 use Magento\Framework\Controller\ResultInterface;
 use Magento\Framework\Exception\NoSuchEntityException;
@@ -25,6 +27,11 @@ class Add extends \Magento\Checkout\Controller\Cart implements HttpPostActionInt
      */
     protected $productRepository;
 
+    /**
+     * @var RequestQuantityProcessor
+     */
+    private $quantityProcessor;
+
     /**
      * @param \Magento\Framework\App\Action\Context $context
      * @param \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
@@ -33,6 +40,7 @@ class Add extends \Magento\Checkout\Controller\Cart implements HttpPostActionInt
      * @param \Magento\Framework\Data\Form\FormKey\Validator $formKeyValidator
      * @param CustomerCart $cart
      * @param ProductRepositoryInterface $productRepository
+     * @param RequestQuantityProcessor|null $quantityProcessor
      * @codeCoverageIgnore
      */
     public function __construct(
@@ -42,7 +50,8 @@ public function __construct(
         \Magento\Store\Model\StoreManagerInterface $storeManager,
         \Magento\Framework\Data\Form\FormKey\Validator $formKeyValidator,
         CustomerCart $cart,
-        ProductRepositoryInterface $productRepository
+        ProductRepositoryInterface $productRepository,
+        ?RequestQuantityProcessor $quantityProcessor = null
     ) {
         parent::__construct(
             $context,
@@ -53,6 +62,8 @@ public function __construct(
             $cart
         );
         $this->productRepository = $productRepository;
+        $this->quantityProcessor = $quantityProcessor
+            ?? ObjectManager::getInstance()->get(RequestQuantityProcessor::class);
     }
 
     /**
@@ -99,6 +110,7 @@ public function execute()
                         \Magento\Framework\Locale\ResolverInterface::class
                     )->getLocale()]
                 );
+                $params['qty'] = $this->quantityProcessor->prepareQuantity($params['qty']);
                 $params['qty'] = $filter->filter($params['qty']);
             }
 

app/code/Magento/Checkout/Model/Cart/RequestQuantityProcessor.php

@@ -8,7 +8,6 @@
 namespace Magento\Checkout\Model\Cart;
 
 use Magento\Framework\Locale\ResolverInterface;
-use Zend_Locale_Data;
 
 /**
  * Cart request quantity processor
@@ -60,17 +59,18 @@ public function process(array $cartData): array
      */
     public function prepareQuantity($quantity)
     {
-        $symbols = Zend_Locale_Data::getList($this->localeResolver->getLocale(),'symbols');
+        $formatter = new \NumberFormatter($this->localeResolver->getLocale(), \NumberFormatter::CURRENCY);
+        $decimalSymbol = $formatter->getSymbol(\NumberFormatter::DECIMAL_SEPARATOR_SYMBOL);
 
         if (is_array($quantity)) {
             foreach ($quantity as $key => $qty) {
-                if (strpos((string)$qty, '.') !== false && $symbols['decimal'] !== '.') {
-                    $quantity[$key] = str_replace('.', $symbols['decimal'], $qty);
+                if (strpos((string)$qty, '.') !== false && $decimalSymbol !== '.') {
+                    $quantity[$key] = str_replace('.', $decimalSymbol, $qty);
                 }
             }
         } else {
-            if (strpos((string)$quantity, '.') !== false && $symbols['decimal'] !== '.') {
-                $quantity = str_replace('.', $symbols['decimal'], (string)$quantity);
+            if (strpos((string)$quantity, '.') !== false && $decimalSymbol !== '.') {
+                $quantity = str_replace('.', $decimalSymbol, (string)$quantity);
             }
         }