Set related products programatically Magento 2

Set related products programatically Magento 2

$obj = \Magento\Framework\App\ObjectManager::getInstance();

        /** @var \Magento\Catalog\Model\Product $product */
        $productObject = $obj->get('Magento\Catalog\Model\Product');

        $product = $productObject->loadByAttribute('sku', 'Test Test');

        $linkDataAll = [];
        $skuLinks = "0012365,test1233,789456";
        $skuLinks = explode(",",$skuLinks);

        foreach($skuLinks as $skuLink) {
            //check first that the product exist
            $linkedProduct = $productObject->loadByAttribute("sku",$skuLink);
            if($linkedProduct) {
                /** @var  \Magento\Catalog\Api\Data\ProductLinkInterface $productLinks */
                $productLinks = $obj->create('Magento\Catalog\Api\Data\ProductLinkInterface');
                $linkData = $productLinks //Magento\Catalog\Api\Data\ProductLinkInterface
                    ->setSku($product->getSku())
                    ->setLinkedProductSku($skuLink)
                    ->setLinkType("related");
                $linkDataAll[] = $linkData;
            }

        }
        if($linkDataAll) {
            print(count($linkDataAll)); //gives 3
            $product->setProductLinks($linkDataAll);
        }
//        $product->save();

Using $product->save(); is deprecated and should be avoided. You should use the ProductRepositoryInterface to save the product.

And ofcourse, using the ObjectManager is bad behavior and should not be used on production environments.

Hi,
This code is working for me but when I added the related products with this code. Other up-sell and cross-sell removed issues. When I added the related, cross-sell, and up-sell together then only the last value inserted in the product.
Can you please guide me?

Hi,
This code is working for me but when I added the related products with this code. Other up-sell and cross-sell removed issues. When I added the related, cross-sell, and up-sell together then only the last value inserted in the product.
Can you please guide me?

pls use class Magento\Catalog\Api\Data\ProductLinkInterfaceFactory instead of Magento\Catalog\Api\Data\ProductLinkInterface