Orsdxy

I have written a controller in Magento 2 that adds products to the logged in users account.

The controller is working properly however i am facing a slight issue.

You cannot add a product to your cart with a greater quantity than what is in stock. so you cannot add a quantity of 6 if there are only 5 in stock, this results in a 500 error. to get around this I am using this:

if($QuantityToAdd > $ProductStock){

   // throw error

}

else{

   // add to cart

}

and this is working fine for the scenario above.

however, this will also allow the user to add 4 products, and then try to add another 2 products separately. This will again result in a 500 error, stating:

main.ERROR: We don't have as many "XXXX" as you requested.

in the logs.

So I added a foreach, on the current cart items to get the quantity of that product already in the cart:

if(($QuantityToAdd + $QuantityInCart) > $ProductStock){

   // throw error

}

else{

   // add to cart

}

this solved my errors. However now the controller regularly times out as it will cycle the cart foreach within the add products for each, so if the user is trying to add 200 product variants and they already have 200 products in the cart, the controller will loop over 40,000 times.

200x200 = 40,000 loops

The quantities mentioned here are potentially at the lower end of possible usage.

To optimise this I have found a function:

if ($this->checkoutSession->create()->getQuote()->hasProductId($productId)) {

    //product is available in the cart

}

Without performing another foreach, or any kind of loop, is it possible to get the current quantity of the product in the cart, if the above if statement is true?

or alternatively,

$this->cart->addProduct($productToadd, $params);

is there a function that updates the product in the cart instead of adding the new quantity on to the existing quantity?

Thanks.

EDIT:

Foreach by request:

foreach($products as $purchase){

        $productSku = $purchase['Sku'];

        $qty = $purchase['Quantity'];



        $loadedProduct = $this->getProductBySku($productSku);



        $productStock = $this->stockRegistry->getStockItem($loadedProduct->getId());

        $manageStock = $productStock->getData('manage_stock');



        if($manageStock == "1"){

          $productQty = $productStock->getQty();

          $quantityInCart = 0;

          $items = $this->cart->getQuote()->getAllItems();

          $productId=$loadedProduct->getId();

          foreach ($items as $item) {

                if ($item->getProductId() == $productId) {

                  $quantityInCart = $quantityInCart + $item->getQty();

                }

            }

          if($productStock->getBackorders() > 1){

            if(($qty + $quantityInCart) > $productQty){

              $this->_messageManager->addError(__("Failed to add " . $purchase['Name'] . " - " .$purchase['Option'] . " " . $productQty . " available"));

              $return = $purchase['Name'] . " - " .$purchase['Option'] . " " . $productQty . " available";

              $proceed = false;

              $returnObject->success = false;

            }

          }

        }

      }

This foreach checks through each of the products the user is trying to add, if they are all fine, there is a second for each to add the products.