How to get the related products for a product?

dmitrii_fediuk · January 24, 2016, 6:23am

You should use one of the following methods:

\Magento\Catalog\Model\Product::getRelatedProducts()

magento/magento2/blob/43e3fd79/app/code/Magento/Catalog/Model/Product.php#L1205-L1221


/**
 * Retrieve array of related products
 *
 * @return array
 */
public function getRelatedProducts()
{
    if (!$this->hasRelatedProducts()) {
        $products = [];
        $collection = $this->getRelatedProductCollection();
        foreach ($collection as $product) {
            $products[] = $product;
        }
        $this->setRelatedProducts($products);
    }
    return $this->getData('related_products');
}

\Magento\Catalog\Model\Product::getRelatedProductCollection()

github.com

magento/magento2/blob/43e3fd79/app/code/Magento/Catalog/Model/Product.php#L1240-L1250


/**
 * Retrieve collection related product
 *
 * @return \Magento\Catalog\Model\ResourceModel\Product\Link\Product\Collection
 */
public function getRelatedProductCollection()
{
    $collection = $this->getLinkInstance()->useRelatedLinks()->getProductCollection()->setIsStrongMode();
    $collection->setProduct($this);
    return $collection;
}

\Magento\Catalog\Model\Product::getRelatedProductIds()

github.com

magento/magento2/blob/43e3fd79/app/code/Magento/Catalog/Model/Product.php#L1223-L1238


/**
 * Retrieve related products identifiers
 *
 * @return array
 */
public function getRelatedProductIds()
{
    if (!$this->hasRelatedProductIds()) {
        $ids = [];
        foreach ($this->getRelatedProducts() as $product) {
            $ids[] = $product->getId();
        }
        $this->setRelatedProductIds($ids);
    }
    return $this->getData('related_product_ids');
}

A usage example:

github.com

magento/magento2/blob/43e3fd79/app/code/Magento/Catalog/Block/Product/ProductList/Related.php#L83-L99


$product = $this->_coreRegistry->registry('product');
/* @var $product \Magento\Catalog\Model\Product */


$this->_itemCollection = $product->getRelatedProductCollection()->addAttributeToSelect(
    'required_options'
)->setPositionOrder()->addStoreFilter();


if ($this->moduleManager->isEnabled('Magento_Checkout')) {
    $this->_addProductAttributesAndPrices($this->_itemCollection);
}
$this->_itemCollection->setVisibility($this->_catalogProductVisibility->getVisibleInCatalogIds());


$this->_itemCollection->load();


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