Magento2-Send email notification to main admin when price changed by admin

Question

I want to send eamil notification to main admin, for modification avail in price by any admin.

Please help,

Thank You in advance.

Answer 1

You should use the around plugin for your requirement. around plugin should be used on afterSave($object) method of \Magento\Catalog\Model\Product\Attribute\Backend\Price class.

This class has been assigned as backend_model to product prices attributes so when product prices will be updated this backend_model class will be called.

So below given code will be useful to you to send the email when value of price attribute will be changed.

FILE: Kartik\PriceUpdate\etc\adminhtml\di.xml

<?xml version="1.0" ?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Catalog\Model\Product\Attribute\Backend\Price">
        <plugin name="send_email_when_price_change" type="Kartik\PriceUpdate\Plugin\Product\Attribute\Backend\PricePlugin"/>
    </type>
</config>

FILE: Kartik\PriceUpdate\Plugin\Product\Attribute\Backend\PricePlugin.php

<?php
namespace Kartik\PriceUpdate\Plugin\Product\Attribute\Backend;

class PricePlugin
{
    const PRICE_ATTRIBUTE = 'price';

    /**
     * @param \Magento\Catalog\Model\Product\Attribute\Backend\Price $subject
     * @param callable $proceed
     * @param $object
     * @return mixed
     */
    public function aroundAfterSave(\Magento\Catalog\Model\Product\Attribute\Backend\Price $subject, callable $proceed, $object)
    {
        $result = $proceed($object);
        $attributeCode = $subject->getAttribute()->getAttributeCode();

        if ($attributeCode == self::PRICE_ATTRIBUTE) {
            if ($object->hasData($attributeCode)) {
                $originalData = $object->getOrigData($attributeCode);
                $newData = $object->getData($attributeCode);

                if ($originalData !== $newData) {
                    // implement your email logic here
                }
            }
        }
        return $result;
    }
}

Plugin is always better option while implementing this type of requirement. If plugin is not helpful then only you should move to different solution.

Answer 2

You should be able to hook in to the catalog_product_save_after event to create an observer, & look at $observer->getProduct()->getData() to see the new data. You can compare a specific number of fields (eg: price, special_price) by checking getData() vs getOrigData()

There's a more complete answer here which should hold up for Magento 2.3.