How to Set Conditions to Restrict Adding Products in Magento 2

Product management becomes tricky when you want to sell products with the conditions. Some of the examples are allowing to add only one product in the cart, adding only one product from each category, only adding one product type in the cart, no two products can be added with each other and many other rules. To apply such rules, you have to Set Conditions to Restrict Adding Products in Magento 2 and work on cart conditions and events.

Here, I’ve come up with the custom code to set conditions to restrict adding Magento 2 products to the shopping cart. The only thing you have to do is define the condition as per your requirement.

Steps to Set Conditions to Restrict Adding Products in Magento 2:

1. Create event.xml in etc folder
   
   <?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="controller_action_predispatch_checkout_cart_add"> <observer name="restrict_sales_model_cart_add_before" instance="Vendor\Extension\Observer\Cartadd"/> </event> </config>

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   <?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="controller_action_predispatch_checkout_cart_add">         <observer name="restrict_sales_model_cart_add_before" instance="Vendor\Extension\Observer\Cartadd"/>     </event> </config>

2. Create Cartadd.php file under the Observer folder
   
   <?php namespace Vendor\Extension\Observer; use Magento\Framework\Event\ObserverInterface; use Magento\Framework\App\Response\RedirectInterface; use Magento\Checkout\Model\Cart; use Magento\Framework\Message\ManagerInterface; use Magento\Framework\App\RequestInterface; use Magento\Catalog\Model\Product; use Magento\Framework\App\Http\Context as customerSession; class Cartadd implements ObserverInterface{ protected $cart; protected $messageManager; protected $redirect; protected $request; protected $product; protected $customerSession; public function __construct(RedirectInterface $redirect, Cart $cart, ManagerInterface $messageManager, RequestInterface $request, Product $product, customerSession $session){ $this->redirect = $redirect; $this->cart = $cart; $this->messageManager = $messageManager; $this->request = $request; $this->product = $product; $this->customerSession = $session; } public function execute(\Magento\Framework\Event\Observer $observer){ $postValues = $this->request->getPostValue(); $cartItemsCount = $this->cart->getQuote()->getItemsCount(); //your code to restrict add to cart if (condtion) { $observer->getRequest()->setParam('product', false); $this->messageManager->addErrorMessage(__('error msg . ')); } } }

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   <?php   namespace Vendor\Extension\Observer;   use Magento\Framework\Event\ObserverInterface; use Magento\Framework\App\Response\RedirectInterface; use Magento\Checkout\Model\Cart; use Magento\Framework\Message\ManagerInterface; use Magento\Framework\App\RequestInterface; use Magento\Catalog\Model\Product; use Magento\Framework\App\Http\Context as customerSession;   class Cartadd implements ObserverInterface{     protected $cart;     protected $messageManager;     protected $redirect;     protected $request;     protected $product;     protected $customerSession;       public function __construct(RedirectInterface $redirect, Cart $cart, ManagerInterface $messageManager,  RequestInterface $request, Product $product, customerSession $session){         $this->redirect = $redirect;         $this->cart = $cart;         $this->messageManager = $messageManager;         $this->request = $request;         $this->product = $product;         $this->customerSession = $session;     }       public function execute(\Magento\Framework\Event\Observer $observer){             $postValues = $this->request->getPostValue();             $cartItemsCount = $this->cart->getQuote()->getItemsCount();             //your code to restrict add to cart             if (condtion) {                 $observer->getRequest()->setParam('product', false);                 $this->messageManager->addErrorMessage(__('error msg . '));         }     } }

With the above method, you can control inventory and set conditions to restrict adding Magento 2 products by the users in the front end!

Or, you could simply use the Magento 2 Call for Price extension to restrict customers to add products to the cart and instead call you for inquiring about pricing. The extension will hide the product prices and the “Add to Cart” button.

Let me know your doubts and questions in the comments section. Also, let me know how this code has helped and which conditions you have set to restrict adding Magento 2 products.

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Thanks 🙂