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    Preventing a product from being added to cart in magento

    Updated 25 December 2017

    This article is aimed towards preventing a product from being added to cart. For this we will have to call an observer.
    So we can either use observer ‘checkout_cart_product_add_after‘ or ‘controller_action_predispatch_sales_order_reorder‘.





    Now after adding an observer we need to write the action which we are going to perform, i.e, preventing a product from being added to cart. We can achieve this by using either of the following 2 ways:

    class Webkul_Module_Model_Observer {
        public function functionName($observer) {
            if($condition) {
                Mage::throwException(Mage::helper('module')->__('Quantity not available'));
                // OR
                Mage::getSingleton('core/session')->addNotice('Quantity not available');
                $observer->getControllerAction()->setFlag('', Mage_Core_Controller_Varien_Action::FLAG_NO_DISPATCH, true);

    In place of $condition we need to put the condition due to which the product will not be added to cart.
    And that’s it.
    Happy coding.

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