protected function _prepareData()
{
$limit = Mage::getStoreConfig('recommender/relatedproducts/numberofupsellproducts');
/* @var $product Mage_Catalog_Model_Product */
$product = Mage::registry('product');
// A bit of a hack, but return an empty collection if user selected 0 recommendations to show in config
if ($limit < 1) {
$this->_itemCollection = $product->getRelatedProductCollection();
$this->_itemCollection->load();
$this->_itemCollection->clear();
return $this;
}
// Get manual links
// Set link source to automated CommerceStack recommendations
$linkModel = $product->getLinkInstance();
$linkModel->useLinkSourceManual();
parent::_prepareData();
$unionLinkedItemCollection = $this->_itemCollection;
$numRecsToGet = $limit;
if (!is_null($unionLinkedItemCollection)) {
$numRecsToGet = $limit - count($unionLinkedItemCollection);
}
if ($numRecsToGet > 0) {
// Figure out if we should use a category filter
$constrainCategory = Mage::getStoreConfig('recommender/relatedproducts/constraincategory');
$currentCategory = Mage::registry('current_category');
if (is_object($currentCategory)) {
$productCategory = $currentCategory;
}
if (is_null($currentCategory)) {
// This could be a recently viewed or a search page. Try to get category collection and arbitrarily use first
/* @var $currentProduct Mage_Catalog_Model_Product */
$currentProduct = Mage::registry('current_product');
if (is_object($currentProduct)) {
$currentCategory = $currentProduct->getCategoryCollection();
$productCategory = $currentCategory->getFirstItem();
$currentCategory = $productCategory;
}
}
$useCategoryFilter = !is_null($currentCategory) && $constrainCategory;
// Set link source to automated CommerceStack recommendations
$linkModel = $product->getLinkInstance();
$linkModel->useLinkSourceCommerceStack();
$upsellSource = Mage::getStoreConfig('recommender/relatedproductsadvanced/upsellsource');
}
while ($numRecsToGet > 0) {
if ($upsellSource == 'related') {
$linkedItemCollection = $product->getRelatedProductCollection()->addAttributeToSelect('required_options')->setGroupBy()->setPositionOrder()->addStoreFilter();
} elseif ($upsellSource == 'crosssell') {
$linkedItemCollection = $product->getCrossSellProductCollection()->setGroupBy()->setPositionOrder()->addStoreFilter();
}
$linkedItemCollection->getSelect()->limit($numRecsToGet);
if ($useCategoryFilter) {
$linkedItemCollection->addCategoryFilter($currentCategory);
}
if (!is_null($unionLinkedItemCollection)) {
$linkedItemCollection->addExcludeProductFilter($unionLinkedItemCollection->getAllIds());
}
Mage::getResourceSingleton('checkout/cart')->addExcludeProductFilter($linkedItemCollection, Mage::getSingleton('checkout/session')->getQuoteId());
$this->_addProductAttributesAndPrices($linkedItemCollection);
Mage::getSingleton('catalog/product_visibility')->addVisibleInCatalogFilterToCollection($linkedItemCollection);
$linkedItemCollection->load();
// Add new source linked items to existing union of linked items
if (is_null($unionLinkedItemCollection)) {
$unionLinkedItemCollection = $linkedItemCollection;
} else {
foreach ($linkedItemCollection as $linkedProduct) {
$unionLinkedItemCollection->addItem($linkedProduct);
}
}
if (!is_null($unionLinkedItemCollection)) {
$numRecsToGet = $limit - count($unionLinkedItemCollection);
}
// Go up a category level for next iteration
$currentCategory = $currentCategory->getParentCategory();
if (is_null($currentCategory->getId())) {
break;
}
}
// If we still don't have enough recommendations fill out the remaining with randoms.
$currentCategory = $productCategory;
while ($numRecsToGet > 0) {
$randCollection = Mage::getResourceModel('catalog/product_collection');
Mage::getModel('catalog/layer')->prepareProductCollection($randCollection);
$randCollection->getSelect()->order('rand()');
$randCollection->addStoreFilter();
$randCollection->setPage(1, $numRecsToGet);
$randCollection->addIdFilter(array_merge($unionLinkedItemCollection->getAllIds(), array($product->getId())), true);
Mage::getSingleton('catalog/product_visibility')->addVisibleInCatalogFilterToCollection($randCollection);
if ($useCategoryFilter) {
$randCollection->addCategoryFilter($currentCategory);
}
foreach ($randCollection as $linkedProduct) {
$unionLinkedItemCollection->addItem($linkedProduct);
}
if (!$useCategoryFilter) {
break;
}
// We tried everything
if (!is_null($unionLinkedItemCollection)) {
$numRecsToGet = $limit - count($unionLinkedItemCollection);
}
// Go up a category level for next iteration
$currentCategory = $currentCategory->getParentCategory();
if (is_null($currentCategory->getId())) {
break;
}
}
$this->_itemCollection = $unionLinkedItemCollection;
/**
* Updating collection with desired items
*/
Mage::dispatchEvent('catalog_product_upsell', array('product' => $product, 'collection' => $this->_itemCollection, 'limit' => $this->getItemLimit()));
foreach ($this->_itemCollection as $product) {
$product->setDoNotUseCategoryId(true);
}
// We need to reset the link source to manual here so as not to break
// grouped products
$linkModel->useLinkSourceManual();
return $this;
}
