Magento 2 How to update SKU after saving product from admin panel?

Question

I want to update product sku after save product. I had used this event :- catalog_product_save_after In Observer,

public function execute(\Magento\Framework\Event\Observer $observer)
    {
        try {
            $productId = $observer->getProduct()->getId();
            $product = $observer->getProduct();

            $product = $observer->getProduct();       

            $sku = 'TestSku';
            $productFactory = $this->_objectManager->create('\Magento\Catalog\Model\ProductFactory');
            $otherproduct = $productFactory->create()->load($productId);
            $otherproduct->setSku($sku);
            $otherproduct->save();
       }
   }

But while saving product, it gives

No Data Found Error

Please help me to fix it.

Answer 1

It's not update because you are using catalog_product_save_after event. So, on product save again event will be call. So, You can use controller_action_catalog_product_save_entity_after or catalog_product_save_before event and You can update SKU like this below code :

<?php

namespace VendorName\ModuleName\Observer;

use Magento\Framework\Event\ObserverInterface;

class Productsaveafter implements ObserverInterface
{    
    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $_product = $observer->getProduct();  // you will get product object
        $_sku=$_product->getSku(); // check here you get sku or not.
        $_product->setData('sku','test');
        $_product->save();

    }   
}

Answer 2

catalog_product_save_before use this event but dont call save function