Need to save custom attribute during product save grammatically in magneto 2

Question

I have custom attribute in form of drop down and multiselect.But during product save these are not saving in database like i have a warranty dropdown attribute.

 $product->setwarranty($wholedata['product']['warranty']); // Product Warranty

Answer 1

Try this way:

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

Reference:

https://magento.stackexchange.com/a/229280/75828