Get product attribute value on category page - Magento2

Question

We want to load the product attribute value on the category page, of all attributes with a value "Yes" of label "is_featured". We create the following code in the list.phtml, but this really slows down the category list page.

Is there a better/faster way to load these product values?

<?php $attributes = $_product->getAttributes();
foreach($attributes as $a)
{
    if ($a->getData('is_featured') && $a->getFrontend()->getValue($_product) != NULL){
    echo '<li><span class="">' . $a->getFrontend()->getValue($_product). '</span></li>';
    }
}
?>

Answer 1

Following best practice we have 2 ideal options. A Before Plugin or a Preference Override.

Path of Core file: vendor/magento/module-catalog/Model/Product/Type/AbstractType.php

Function to modify: public function getSetAttributes($product)

Examples:

Before Plugin

    public function beforeGetSetAttributes(
        AbstractType $subject,
        Product $product
    ) {
        // Check if custom logic should be applied
        if (!$product->hasData('_cache_instance_product_set_attributes')) {
            // Load only featured attributes for the product's attribute set ID
            $attributeCollection = $this->attributeCollectionFactory->create()
                ->setEntityTypeFilter($product->getResource()->getTypeId())
                ->addFieldToFilter('attribute_set_id', $product->getAttributeSetId())
                ->addFieldToFilter('is_featured', 1)
                ->setOrder('attribute_id', 'ASC');

            

            // Cache the filtered attributes
            $product->setData('_cache_instance_product_set_attributes', $attributeCollection->load());
        }
    }

Preference Override:

use Magento\Catalog\Model\Product\Type\AbstractType as MagentoAbstractType;
use Magento\Catalog\Model\Product;
use Magento\Eav\Model\ResourceModel\Entity\Attribute\CollectionFactory as AttributeCollectionFactory;

class CustomType extends MagentoAbstractType
{
    protected $attributeCollectionFactory;

    public function __construct(
        \Magento\Catalog\Model\ProductFactory $productFactory,
        \Magento\Framework\Event\ManagerInterface $eventManager,
        \Magento\Eav\Model\Config $eavConfig,
        \Magento\Framework\Module\Manager $moduleManager,
        AttributeCollectionFactory $attributeCollectionFactory
    ) {
        parent::__construct($productFactory, $eventManager, $eavConfig, $moduleManager);
        $this->attributeCollectionFactory = $attributeCollectionFactory;
    }

    public function getSetAttributes($product)
    {
        // Check if custom logic should be applied
        if (!$product->hasData('_cache_instance_product_set_attributes')) {
            // Load all attributes for the product's attribute set ID
            $attributeCollection = $this->attributeCollectionFactory->create()
                ->setEntityTypeFilter($product->getResource()->getTypeId())
                ->addFieldToFilter('attribute_set_id', $product->getAttributeSetId())
                ->addFieldToFilter('is_featured', 1)
                ->setOrder('attribute_id', 'ASC');

            $product->setData('_cache_instance_product_set_attributes', $setAttributes);
        }
        return $product->getData($this->_cacheProductSetAttributes);


    }

If this is a universal change (loading of any type of attribute collection) then you're better off doing a preference override here:

Path vendor/magento/module-eav/Model/Config.php

Function protected function _initAttributes($entityType)