Magento - Promotions don't apply to downloadable files prices

Question

Initial conditions:

Magento 1.7 installed (haven't tried with previous versions)
One (downloadable) product with multiple downloadable files, with prices added to the default product (let's say product that costs 50$ + 2 downloadable files, one free, the other an extra 50$ )
A new promotion (Catalog price rule) that applies to all products (let's say -20%)

More info about promotion:

Applies to all products, all groups, is active and applied, applies 'by percentage of original price', enable discount for subproducts -> Yes, stop further rule for processing -> No

Expected result:

Price for the product with the 50$ file: 80$ (80% from 100$)

Actual result:

Price for the product with the 50$ file: 90$ (80% from the initial 50$, and the full price for the downloadable file).

Conclusion:

The promotion doesn't apply to the extra prices that downloadable files have.

Question(s):

Is this the desired behavior for downloadable files? Or is this a bug ?
Any tips on how to modify the code (eventually create a module) to make it work as expected ? (Just tips, ie. what to extend)

Meabed Meabed · Accepted Answer · 2013-04-20T20:40:57

Links / downloadable files its not products entities ( so it doesn't have price_index table and it doesn't treated as products )

There is 2 Ways to apply promotion in products

Catalog Price Rules
Shopping Cart Price Rules

As your question stated that you used Catalog Price Rules I have solved your question using Catalog Price Rules.

Create Module and rewrite the Model

Mage_Downloadable_Model_Product_Type

======

<global>
    <models>
        <downloadable>
            <rewrite>
                <product_type>Web_Eproduct_Model_Downloadable_Product_Type</product_type>
            </rewrite>
        </downloadable>
    </models>
</global>

and the Code Below calculate the price of each Link on the fly ( even if you have more than one rule applied to the same product )

class Namespace_Modulename_Model_Downloadable_Product_Type extends Mage_Downloadable_Model_Product_Type {
    public function getLinks($product = null)
    {
        $product = $this->getProduct($product);
        $wId = Mage::app()->getWebsite()->getId();
        $gId = Mage::getSingleton('customer/session')->getCustomerGroupId();
        $catalogRules = Mage::getSingleton('catalogrule/resource_rule')->getRulesFromProduct('',$wId,$gId,$product->getId());

        /* @var Mage_Catalog_Model_Product $product */
        if (is_null($product->getDownloadableLinks())) {
            $_linkCollection = Mage::getModel('downloadable/link')->getCollection()
                ->addProductToFilter($product->getId())
                ->addTitleToResult($product->getStoreId())
                ->addPriceToResult($product->getStore()->getWebsiteId());
            $linksCollectionById = array();
            foreach ($_linkCollection as $link) {
                /* @var Mage_Downloadable_Model_Link $link */

                $link->setProduct($product);

                $link->setPrice($this->calcLinkPrice($catalogRules,$link->getPrice()));
                $linksCollectionById[$link->getId()] = $link;
            }
            $product->setDownloadableLinks($linksCollectionById);
        }
        return $product->getDownloadableLinks();
    }
    public function calcLinkPrice(array $rules = array(),$productPrice = 0 )
    {
        foreach($rules as $ruleData)
        {
            $productPrice = Mage::helper('catalogrule')->calcPriceRule(
                $ruleData['action_operator'],
                $ruleData['action_amount'],
                $productPrice);
        }
        return $productPrice;
    }
}

I have tested it and confirmed its working as you expect :)

Try it and let me know your thoughts :)

There is another way to achieve this if you will use Shopping Cart Price Rules i will post it later.

Magento - Promotions don't apply to downloadable files prices

2 Answers