Set group id is equal to 2 for wholesale customer registration in Magento 2

Question

Hello everyone I want to set group_id = 2 for wholesale customer registration.
I have to override the registration form in view/registration.phtml and also written

<input type="hidden" name="group_id" id="group_id" value="2" />

I have also created the observer

Magneto\WholesaleCustomer\Observer\Customer\RegisterSuccess.php

<?php 


 namespace Magneto\WholesaleCustomer\Observer\Customer;

 use Magento\Customer\Api\CustomerRepositoryInterface;




 class RegisterSuccess implements 
\Magento\Framework\Event\ObserverInterface {

 /**
 * @var CustomerRepositoryInterface
 */
 //added by me
private $customerRepository;

public function __construct(
    \Magento\Framework\App\RequestInterface $request,
     CustomerRepositoryInterface $customerRepository
    )
{
    $this->_request = $request;
    $this->customerRepository = $customerRepository;
}
//ends here
public function execute(
    \Magento\Framework\Event\Observer $observer
){      

    $id = $observer->getEvent()->getCustomer()->getId();
    $customer = $this->customerRepository->getById($id);

     $group_id = $this->_request->getParam('group_id');

    $customer->setGroupId($group_id);

    $this->customerRepository->save($customer);

}
}

But the group id is coming 1 in the database I want to set it as 2 in database.

Answer 1

You need to first create event.xml file for your observer Vendor\Module\etc\frontend\events.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="customer_register_success">
        <observer name="persistent" instance="Vendor\Module\Observer\ChangeCustomerGroupId" />
    </event>
</config>

and create observer after that Vendor\Module\Observer\ChangeCustomerGroupId.php

<?php

namespace Vendor\Module\Observer;

use Magento\Framework\Event\ObserverInterface;

class ChangeCustomerGroupId implements ObserverInterface
{

    protected $_customerRepositoryInterface;
    protected $_request;

    public function __construct(
        \Magento\Customer\Api\CustomerRepositoryInterface $customerRepositoryInterface,
        \Magento\Framework\App\RequestInterface $request,
    ) {
        $this->_customerRepositoryInterface = $customerRepositoryInterface;
        $this->_request = $request;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $customer = $observer->getEvent()->getCustomer();
        if ($customer->getGroupId() == 1) {
            $postData = $this->_request->getPost();
            $customer->setGroupId($postData["group_id"]);
            $this->_customerRepositoryInterface->save($customer);;
        }
    }
}