how to prevent a product be added to a cart?

Question

For certain reason, i have to prevent the users to add the product into the cart.

here is the event in config.xml

<events>
    <controller_action_predispatch_checkout_cart_add>
        <observers>
            <abc_findp>
                <type>model</type>
                <class>Abc_Findp_Model_Observer</class>
                <method>searchStock</method>
            </abc_findp>
        </observers>
    </controller_action_predispatch_checkout_cart_add>
</events>

Observer:

public function searchStock($observer) {

    //how to prevent a product be added to a cart?
    Mage::getSingleton('core/session')->addNotice('This product can't be added to shopping cart.');



} 

Or i need to use checkout_cart_product_add_after event, to remove the quote item after added into a cart?

Thanks.!

Answer 1

this is so funny method to solve the problem.

change to use checkout_cart_product_add_after and use in observer method

public function removeMessage ($observer) {
    $observer->_getSession()->getMessages(true);
}

this will prevent the product to be added into the cart and avoid the success message