In this blog, we are going to show you how to create a product attribute using the latest Declarative

Schema “data patch “.

A Data patch is a class that stores instructions for data modification. Using a data patch we can add custom product attributes in Magento 2 by creating a PHP file.

Once you Create the file AddCustomProductAttribute.php in this directory .  app/code/VenderName/ModuleName/ Setup/Patch/Data/. and paste the below code :

AddCustomProductAttribute.php

<?php
namespace VenderName\ModuleName\Setup\Patch\Data;
 
use Magento\Eav\Setup\EavSetup;
use Magento\Eav\Setup\EavSetupFactory;
use Magento\Framework\Setup\Patch\DataPatchInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
use Magento\Framework\Setup\ModuleContextInterface;

class AddCustomProductAttribute implements DataPatchInterface
{
    protected $_eavSetupFactory;
	
	protected $_moduleDataSetup;
    
    /**
     * @param ModuleDataSetupInterface $_moduleDataSetup
     */
  
    public function __construct(
		EavSetupFactory $_eavSetupFactory, 
		ModuleDataSetupInterface $_moduleDataSetup
	){
        $this->eavSetupFactory = $_eavSetupFactory;
		$this->_moduleDataSetup = $_moduleDataSetup;
    }
  
    public function apply()
    {
        $eavSetup = $this->eavSetupFactory->create(array('setup' => $this->_moduleDataSetup));
        
        $eavSetup->addAttribute(
            \Magento\Catalog\Model\Product::ENTITY,
            'indexfollow_enable',
            array(
                'group' => 'Index Follow',
                'type' => 'text',
                'backend' => '',   
                'frontend' => '',
                'label' => 'Enable Index Follow',
                'input' => 'boolean',
                'class' => 'indexfollow_enable',
                'source' => \Magento\Eav\Model\Entity\Attribute\Source\Boolean::class,
                'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_GLOBAL,
                'visible' => true,
                'required' => false,
                'user_defined' => true,
                'default' => '',
                'searchable' => false,
                'filterable' => false,
                'comparable' => false,
                'visible_on_front' => false,
                'used_in_product_listing' => true,
                'unique' => false,                
            )    
        );
    }
	
	/**
	* {@inheritdoc}
	*/
	public static function getDependencies()
	{
		return array();
	}

	/**
	* {@inheritdoc}
	*/
	public function getAliases()
	{
		return array();
	}

	/**
	* {@inheritdoc}
	*/
	public static function getVersion()
	{
		return ‘1.0.0'}
}

after will running the below command :

• php -dmemory_limit=2G bin/magento setup:upgrade
• php -dmemory_limit=2G bin/magento setup:static-content:deploy -f -j
• php -dmemory_limit=2G bin/magento cache:flush

Now, you can see in the eav_attribute table that your custom product attribute was created successfully using the data patch.

If you have any questions let me know in the comment section.

Thank you!