Add custom column filter in customer grid collection in Magento 2

Hello Friends!!!
In this article, we will learn how we can add custom attributes or custom column filters in customer grid collection at the admin end.

To customize the customer grid collection, we need to follow the below steps:

Step1. Create a di.xml file inside the app/code/Vendor/Module/etc/ directory. And add the below-mentioned code in this file.

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <preference for="Magento\Customer\Model\ResourceModel\Grid\Collection" type="Vendor\Module\Model\ResourceModel\CustomerGrid\Collection"/>
</config>

Step2. Create Collection.php file inside the app/code/Vendor/Module/Model/ResourceModel/CustomerGrid/ directory.

<?php
namespace Vendor\Module\Model\ResourceModel\CustomerGrid;

use Magento\Customer\Model\ResourceModel\Customer;
use Magento\Customer\Ui\Component\DataProvider\Document;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\Data\Collection\Db\FetchStrategyInterface as FetchStrategy;
use Magento\Framework\Data\Collection\EntityFactoryInterface as EntityFactory;
use Magento\Framework\Event\ManagerInterface as EventManager;
use Magento\Framework\Locale\ResolverInterface;
use Magento\Framework\Stdlib\DateTime\TimezoneInterface;
use Magento\Framework\View\Element\UiComponent\DataProvider\SearchResult;
use Psr\Log\LoggerInterface as Logger;

/**
 * Customer Grid Collection Class
 */
class Collection extends \Magento\Customer\Model\ResourceModel\Grid\Collection
{

    /**
     * @param EntityFactory $entityFactory
     * @param Logger $logger
     * @param FetchStrategy $fetchStrategy
     * @param EventManager $eventManager
     * @param ResolverInterface $localeResolver
     * @param \Magento\Backend\Model\Auth\Session $adminSession
     * @param string $mainTable
     * @param string $resourceModel
     * @param TimezoneInterface|null $timeZone
     */
    public function __construct(
        EntityFactory $entityFactory,
        Logger $logger,
        FetchStrategy $fetchStrategy,
        EventManager $eventManager,
        ResolverInterface $localeResolver,
        \Magento\Backend\Model\Auth\Session $adminSession,
        $mainTable = 'customer_grid_flat',
        $resourceModel = Customer::class,
        TimezoneInterface $timeZone = null
    ) {
        $this->adminSession = $adminSession;
        parent::__construct(
            $entityFactory,
            $logger,
            $fetchStrategy,
            $eventManager,
            $localeResolver,
            $mainTable,
            $resourceModel,
            $timeZone
        );
    }

    /**
     * @inheritdoc
     */
    protected function _initSelect()
    {
        parent::_initSelect();

        if (!is_null($this->adminSession->getUser())) {
            $roleName = $this->adminSession->getUser()->getRole()->getRoleName();
            $userId = $this->adminSession->getUser()->getId();
            if ($userId && $roleName != "Administrator") {
                //added filter for user_id custom column
                $this->getSelect()->where("main_table.user_id=$userId");
            }
        }
        
        return $this;
    }
}

Now, see the result at the admin end in customer grid collection.

Hope this will be helpful.
Thanks 🙂