How To Create Plugin Using Custom Module in Magento / Adobe Commerce 2.x

The following below steps to create custom module using plugin

Step [1] – Nominate Module Name ::

_{Syntax as below}

_{Namespace_Modulename =Mage2db_John}

_{Magento2 Root Directory / app /code / Mage2db / John}

Step [2] – Create a module’s registration file :: This file name is registration.php & used to registered module.

_{File Path as below}

_{Magento2 Root Directory / app /code / Mage2db / John / registration.php}

_{Write below code in registration.php}

_{<?php

\Magento\Framework\Component\ComponentRegistrar::register(
    \Magento\Framework\Component\ComponentRegistrar::MODULE,
    'Mage2db_John',
    __DIR__
);}

Step [3] – Create a module’s naming configuration file :: This file name is module.xml & used to define module name

_{File Path as below}

_{Magento2 Root Directory / app /code / Mage2db / John / etc / module.xml}

_{Write below code in module.xml}

_{<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
<module name="Mage2db_John" setup_version="1.0.0"/> 
</config>}

Step [4] – Create a di.xml file to define Preference

_{File Path as below}

_{Magento2 Root Directory / app /code / Mage2db / John / etc / di.xml}

_{Write below code in di.xml to define Preference}

_{<?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">
        <plugin name="change_product_price"      type="Mage2db\John\Plugin\Product" sortOrder="1" />
    </type>

    <type name="Magento\Checkout\Model\Cart">
        <plugin name="change_product_quantity"   type="Mage2db\John\Plugin\Cart" sortOrder="1" />
    </type>
</config>}

Step [5] – After Plugin

Create a product.php file

_{File Path as below}

_{Magento2 Root Directory / app /code / Mage2db / John / Plugin / Product.php}

Write below code in product.php to extend core functionality of Product Model (to increase product price)

_{<?php
namespace Mage2db\John\Plugin;

class Product
{
	public function afterGetPrice(\Magento\Catalog\Model\Product $productprice, $result){
		$result += 100;
		return $result	; 
	}
}}

Step [6] – Before Plugin

Create a cart.php file

_{File Path as below}

_{Magento2 Root Directory / app /code / Mage2db / John / Plugin / cart.php}

Write below code in cart.php to extend core functionality of cart model (to increase added product quantity)

_{<?php 

namespace Mage2db\John\Plugin;

class Cart
{
	public function beforeAddProduct(\Magento\Checkout\Model\Cart $productInfo, $productcartqty = null)
	{
		$productcartqty['qty'] = 10; 
		return array($productInfo, $productcartqty);
	}
}}

Step [7] – Finally run below CLI command & changes would be reflected as below

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