php - How to prevent adding same product to cart more then one time in magento -


i new in magento development. dont want user add product more once cart.if he/she need change qty of product he/she need change mycart page add cart button allow once add product, after when he/she clicks on add cart button must "it added cart if want change quantity please go mycart".

for example can see www.flipkart.com.

have at:

product -> inventory -> maximum qty allowed in shopping cart

system -> configuration -> inventory -> maximum qty allowed in shopping cart

have @ customize magento using event/observer.

events use, example: checkout_cart_update_items_before , checkout_cart_product_add_after

also i'd suggest looking atthe: /app/code/core/mage/checkout/model/cart.php other events might helpful.

in file also, you'll find code like:

$this->getcheckoutsession()->adderror(   mage::helper('checkout')->__('some of requested products unavailable.') );

which use displaying the error message customer.


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