停止添加到购物车并在Magento中向用户提供消息

Question

我已经成功地在Magento中建立了一个观察者,它结合了自定义的添加到购物车事件.现在,在某种情况下,我需要停止添加到购物车事件(或者甚至将其删除？),并向用户发送消息.

目前,此产品设置为允许每个订单的最大数量为1.如果用户尝试添加超过1,Magento将显示错误消息并阻止将该项添加到购物车.

屏幕截图:[link] http://cl.ly/image/3V2C2j1S0f37

理想情况下,我想模仿观察者的相同功能,但我完全不知道如何解决这个问题,因为我是Magento的新手.

我读过我需要抛出异常.但是当我这样做时,它只是把我带到了一个错误页面.想知道我是否需要以某种方式添加此修改版本:

Mage::helper('cataloginventory')->__('The maximum quantity allowed for purchase is %s.', '<span class="sku-failed-qty" id="sku-stock-failed-' . $item->getId() . '">' . ($item->getQtyMaxAllowed()  * 1) . '</span>');

任何帮助或指针将不胜感激.

Answer 1

您可以尝试以下方法.这将检查数量是否大于1.如果是这种情况,那么我们将数量更新为1.我们还添加通知消息,以便用户了解数量变化.

<checkout_cart_product_add_after>
<observers>
    <company_module_name>
        <type>singleton</type>
        <class>Company_Module_Model_Observer</class>
        <method>checkItem</method>
    </company_module_name>
</observers>

public function checkItem($obj) {       
    //check if qty is more then 1
    if($obj->getProduct()->getQty() > 1) {
    //set notice to inform the visitor that there is a maximum
    Mage::getSingleton('core/session')->addNotice('The maximum quantity allowed for purchase is 1.');

    //get the event 
    $event = $obj->getEvent();

    //get the product we have added
    $product = $event->getProduct();

    //get the quote item
    $quoteItem = $event->getQuoteItem();

    //change the qty to 1 allowed
    $quoteItem->setQty(1);

    //recalc totals
    $quoteItem->getQuote()->collectTotals();

    //save the item
    $quoteItem->getQuote()->save();
}

=====编辑======

另一种选择是:

<controller_action_predispatch_checkout_cart_add>
    <observers>
        <aquait_aquait_name>
            <type>singleton</type>
            <class>Aquait_Aquait_Model_Observer</class>
            <method>checkfunction</method>
        </aquait_aquait_name>
    </observers>
</controller_action_predispatch_checkout_cart_add>


public function checkfunction($observer) 
{
    if ($observer->getEvent()->getControllerAction()->getFullActionName() == 'checkout_cart_add') {
        $productId = Mage::app()->getRequest()->getParam('product');
        $product = Mage::getModel('catalog/product')->load($productId);
        if (Mage::app()->getRequest()->getParam('qty') > 1) {
            Mage::getSingleton('core/session')->addNotice('The maximum quantity allowed for purchase is 1.');
            Mage::app()->getResponse()->setRedirect($product->getProductUrl());
        }
    }

}