Magento 2 stop Magento updating the SKU on duplicate

Question

When I try to create a product with an SKU the same as one that already exists Magento allows the creation but changes the SKU to be xxx-1.

Is there a way to stop this?

Answer 1

The most inclusive way is probably to create a plugin for \Magento\Catalog\Model\ResourceModel\Product and do a beforeSave, and then query the database for any product with that sku and if it exists fail with an error message.

In a module's etc/di.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="\Magento\Catalog\Model\ResourceModel\Product">
        <plugin name="BeforeProductSave" type="MyNamespace\MyModule\Plugin\BeforeProductSave" />
    </type>
</config>

Then create the plugin php in app/code/MyNamespace/MyModule/Plugin/BeforeProductSave.php

<?php
namespace MyNamespace\MyModule\Plugin;

class BeforeProductSave {
    public function __construct(
        \Magento\Catalog\Api\ProductRepositoryInterface $product_repo
    ){
        $this->product_repo = $product_repo;
    }

    public function beforeSave($subject,$object){
        $sku = $object->getData('sku');//this might not work but there is a way to get sku somehow
        $product = $this->product_repo->get($sku);
        if($product->getId()){
            return $object;
        }
        else {
            die("Product $sku already exists");//you can add actual magento2 error handling after you have the rest working
        }
    }
}

I didn't test this code it's just templated from work I've done and by memory but it should at least get you started. You'll have to run setup:di:compile after you add this code to get it working and to test you'll have to create a product.

The nuclear option is to create a preference for the entire \Magento\Catalog\Model\ResourceModel\Product class and exend the \Magento\Catalog\Model\ResourceModel\Product in your preference and rewrite the save function.

Answer 2

It seems question is answered and programmatic solution exists but if anyone needs a quick plug and play addon then below Magento 2 extension should help

https://redchamps.com/product-sku-validator-magento-2-extension.html

Disclosure: This extension is developed by us and it is paid.