Magento: limit product max quantity to 1 per order. quantity 2 = 2 orders

Question

Is it anyhow possible to limit specific products in Magento to a max quantity of one per order? This means the user can only order one product at a time. If he wants to orde

Answer 1

Take a look @ Magento Maximum Allowed Order Amount, you would have to create a custom module to add this feature.

Create an observer for sales_quote_save_before

    
        
            
                
                    
                        inchoo_maxorderamount/observer
                        enforceSingleOrderLimit
                    
                
            
        
    

In your observer

class Inchoo_MaxOrderAmount_Model_Observer
{
    private $_helper;
    public function __construct()
    {
        $this->_helper = Mage::helper('inchoo_maxorderamount');
    }
    /**
     * No single order can be placed over the amount of X
     */
    public function enforceSingleOrderLimit($observer)
    {
        if (!$this->_helper->isModuleEnabled()) {
            return;
        }
        $quote = $observer->getEvent()->getQuote();
        if ($quote->getCart()->getItemsCount() == 1) {

            Mage::getSingleton('checkout/session')->addError('limit only one product per order');
            Mage::app()->getFrontController()->getResponse()->setRedirect(Mage::getUrl('checkout/cart'));
            Mage::app()->getResponse()->sendResponse();
            exit;
        }
    }
}