Magento – Add product to cart with different price using observer

cartevent-observerpriceproductshopping-cart

I currently have an observer which watches for when a product is added to the shopping cart (checkout_cart_product_add_after) and applies a custom price from the product view page. This works fine but I need for it to add a separate version of the same product to the cart if the price is different from any of the current ones. E.g. so the user can buy 1x $400 item, 2x $300 item.

Can this be done ? Currently using a simple product as nothing varies other than the price.

Here is my observer function

public function applyCustomPrice($observer)
{

    $item = $observer->getQuoteItem();

    if ($item->getParentItem()) {
        $item = $item->getParentItem();
    }

    $product = $observer->getProduct();
    $max = $product->getMaxprice();
    if($max) {
        $max = $max * 1;
    } else {
        $max = 500;
    }

    $new_price = Mage::app()->getRequest()->getPost('priceInput');

    if($new_price > $max) {
        $item->getQuote()->removeItem($item->getId());
        $message = 'You must enter a value lower than $'.$max;

        //todo: could try _dataSaveAllowed

        Mage::throwException($message);
        return;
    }

    if(!is_null($new_price) && $this->isCurrency($new_price)) {
        $item->setCustomPrice($new_price);
        $item->setOriginalCustomPrice($new_price);
        $item->getProduct()->setIsSuperMode(true);
    }
}

function isCurrency($number)
{
    return preg_match("/^[0-9]+(?:\.[0-9]{1,2})?$/", $number);
}

Best Answer

This is not quite answering your question, but have you explored using sales rules instead of a coded solution? Go to the magento backend, click through to Promotions -> Shopping Cart Price Rules.

Related Solutions

Magento – How to Add Product to Cart Programmatically via Observer

these are observer maches with your requirement.

sales_quote_add_item
sales_quote_product_add_after
checkout_cart_product_add_after
checkout_cart_add_product_complete
checkout_cart_update_item_complete
checkout_cart_update_items_before
checkout_cart_update_items_after
checkout_cart_save_before
checkout_cart_save_after
checkout_cart_product_update_after
sales_quote_product_add_after

Refer these links for events in magento

API – How to Add Product to Cart with Custom Price

The solution for me was to create a new API method, which allows to set the prices of the products in the cart. The function is based on the cart_product.remove function.

public function setCustomPrice($quoteId, $productsData, $store = null)
{
    $quote = $this->_getQuote($quoteId, $store);
    if (empty($store)) {
        $store = $quote->getStoreId();
    }

    $productsData = $this->_prepareProductsData($productsData);
    if (empty($productsData)) {
        $this->_fault('invalid_product_data');
    }

    $errors = array();
    foreach ($productsData as $productItem) {
        if (isset($productItem['product_id'])) {
            $productByItem = $this->_getProduct($productItem['product_id'], $store, "id");
        } else if (isset($productItem['sku'])) {
            $productByItem = $this->_getProduct($productItem['sku'], $store, "sku");
        } else {
            $errors[] = Mage::helper('checkout')->__("One item of products do not have identifier or sku");
            continue;
        }

        try {
            /** @var $quoteItem Mage_Sales_Model_Quote_Item */
            $quoteItem = $this->_getQuoteItemByProduct($quote, $productByItem,
                $this->_getProductRequest($productItem));
            if (is_null($quoteItem->getId())) {
                $errors[] = Mage::helper('checkout')->__("One item of products is not belong any of quote item");
                continue;
            }

            if(isset($productItem['price'])){
                $quoteItem->setCustomPrice($productItem['price']);
                $quoteItem->setOriginalCustomPrice($productItem['price']);
                $quoteItem->getProduct()->setIsSuperMode(true);
                $quoteItem->save();
            }

        } catch (Mage_Core_Exception $e) {
            $errors[] = $e->getMessage();
        }
    }

    if (!empty($errors)) {
        $this->_fault("remove_product_fault", implode(PHP_EOL, $errors));
    }

    try {
        $quote->collectTotals()->save();
    } catch (Exception $e) {
        $this->_fault("remove_product_quote_save_fault", $e->getMessage());
    }

    return true;
}

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