Magento 2: add existing attribute to product

Question

I have a question, is there a way to add existing attributes to new product? I have some attributes already created in my admin panel and want to add them programmatically , I guess there should be something like this in Product Factory

$_product->setAttribute("Attribute or value of the attribute");

Answer 1

You can use below method to update product attribute value.

$product = $this->productRepository->getById($productId);
$product->setData($attributeCode, $attributeValue2);
$this->productRepository->save($product);

Also, if you want $objectManager method to create a script. You can do it by following below code snippet.

<?php

use Magento\Framework\App\Bootstrap;
require __DIR__ . '/app/bootstrap.php';

$bootstrap = Bootstrap::create(BP, $_SERVER);

$obj = $bootstrap->getObjectManager();

// Set the state. You can also set "adminhtml"
$state = $obj->get('Magento\Framework\App\State');
$state->setAreaCode('frontend');

// Get the first product of a collection
$products = $obj->get('Magento\Catalog\Model\ResourceModel\Product\Collection');
foreach ($products as $p) {
    $p->setData($attributeCode, $attributeValue);
    $p->getResource()->saveAttribute($p, $attributeCode);
}

Hope it helps!!!