How do i get random Cross Sell Products?

Question

This is the piece of code that generates the cross products:

<?php $_helper = $this->helper('catalog/output'); ?>
<?php 
    $_product = $this->getProduct(); 
   // echo get_class($this); 
?>

<?php if($_crossSellProducts = $_product->getCrossSellProducts()): ?>

    <div class="crosssell">
        <h2><?php echo $this->__('Suntem mandri sa va prezentam clientii TRENDfurniture:') ?></h2>

        <ul id="crosssell-products-list">
        <?php foreach ($_crossSellProducts as $_item): ?>

            <?php  
            $_item = Mage::getModel('catalog/product')->load($_item->getId()); 
            ?>
            <li class="item">
                <a class="product-image" href="<?php echo $_item->getProductUrl() ?>" title="<?php echo $this->htmlEscape($_item->getName()) ?>">
                    <img src="<?php echo $this->helper('catalog/image')->init($_item, 'thumbnail'); ?>" alt="<?php echo $this->htmlEscape($_item->getName()) ?>" />
                </a>
            </li>

        <?php endforeach; ?>
        </ul>

        <script type="text/javascript">decorateList('crosssell-products-list', 'none-recursive')</script>
    </div>
<?php endif;?>

I tried to use:

 $_item ->getSelect()->order(new Zend_Db_Expr('RAND()'));                  
 $_item ->setPage(1, 4);

but with no result.This is the result of the get_class function : Mage_Catalog_Block_Product_View

Answer 1

create a function on view.php

    public function getCrosspro(){
        $product = $this->getProduct();
        /* @var $product Mage_Catalog_Model_Product */

        $itemCollection = $product->getCrossSellProductCollection()
            ->addAttributeToSelect(Mage::getSingleton('catalog/config')->getProductAttributes())
            ->setPositionOrder()
            ->addStoreFilter();

        Mage::getSingleton('catalog/product_visibility')->addVisibleInCatalogFilterToCollection($itemCollection);
            $itemCollection->getSelect()->order(new Zend_Db_Expr('RAND()')); 
            $itemCollection->setPage(1, 4);
         $itemCollection->load();

        foreach ($itemCollection as $product) {
            $product->setDoNotUseCategoryId(true);
        };

return $itemCollection
}

and change:

<?php if($_crossSellProducts = $_product->getCrossSellProducts()): ?>

to

<?php if($_crossSellProducts = $this->getCrosspro()): ?>

Answer 2

To implement custom logic for cross sell products, you can override the method getCrossSellProducts or call a method from your own class where do all the magic.

If you need just use the default logic, but sort products randomly each time you need to add sorting by rand before the collection is loaded, not after, as it has no effect.

Edit: Based on your code, apply sorting and limitation on $_crossSellProducts before the loop.

Answer 3

The cross-sell product collection can be obtained using this code:

$_crossSellProductCollection = $_product->getCrossSellProductCollection();

You'd then use that to set the random order and page size:

$_crossSellProductCollection->getSelect()->order(new Zend_Db_Expr('RAND()'));
$_crossSellProductCollection->setPage(1, 4);

Edit: You can then iterate over those products like so:

<?php foreach ($_crossSellProductCollection as $_item): ?>
    ...
<?php endforeach; ?>