In my cart observer, I block 1 item in the cart and then display a notification to the user something like "you could select just one item" the problem that it appears to be the error log Magento first then when I return to the home page. I find my message displayed. I just want to display it in my page and not also in the error log page or display it in the cart page without adding a second item of course.

Observer.php :

class Amir_Prince_Model_ObserverCountItemCart{
    public function limiter_panier(Varient_Event_Observer $observer) {

    $session = Mage::getSingleton('checkout/session');
    $quote = $session->getQuote();

    $message = 'You can select only one item.';
    // Mage::thrownewException($message); // the log error commented
    throw new Exception($message);// the frontend notification


You'll need to remove throw new Exception($message); to stop getting log messages in the exception log. Its also better to use the methods:

Mage::getSingleton(‘core/session’)->addNotice(‘Notice message’);
Mage::getSingleton(‘core/session’)->addError(‘Error message’); 
Mage::getSingleton(‘core/session’)->addWarning(‘Warning message’); 
Mage::getSingleton(‘core/session’)->addSuccess(‘Success message’);

Depending on how you want the message to appear.

  • This method i'll put it where ? in my observer ! i tried to replace: throw new Exception($message); with Mage::getSingleton(‘core/session’)->addNotice(‘Notice message’); but it doesnt work – Miroo Nov 4 '15 at 10:40
  • Is this an ajax action? If you refresh the page does the message show up? – rob3000 Nov 4 '15 at 11:22
  • When i replaced throw new Exception($message); with Mage::getSingleton(‘core/session’)->addNotice(‘Notice message’); I got an Error. No, I want to display it only once each time the user want to add a 2nd item to the cart , I am willing to display it in cart page. here is my process in 4 phases: 1)Index.phtml->2)Result.phtml->3)Cart.phtml->4)Checkout.phtml in phase 2)Result.phtml i do a action button to add to the cart. – Miroo Nov 4 '15 at 13:14
  • what was the error? – rob3000 Nov 5 '15 at 0:08
  • I verified my code, i havnt error now but my observer dont work, i mean : my observer dont block the add. – Miroo Nov 5 '15 at 10:33

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