Magento 2.4 alter contact form post values using plugin afterExecute

Question

I am trying to use a plugin to alter the contact form post data by using the afterExecute method:

    public function afterExecute(\Magento\Contact\Controller\Index\Post $subject, $result)
    {
        $comment =  $subject->getRequest()->getParam('comment', false);
        $subject->getRequest()->setParam('comment', 'testing: '.$comment); // <--- this is not working and not changing the comment post value
        return $result;
    }

I just want to append/prepend a string to the comment (message) that is posted. But the above does not work and the comment post value is not changed. Thanks

Answer 1

use before plugin instead of after plugin.

public function beforeExecute(\Magento\Contact\Controller\Index\Post $subject)
{
    $comment =  $subject->getRequest()->getParam('comment', false);
    $subject->getRequest()->setParam('comment', 'testing: '.$comment); 
}

try this.

Answer 2

Try before plugin with below code

<?php
declare(strict_types=1);

namespace Vendor\MyModule\Plugin\Frontend\Magento\Contact\Controller\Index;

class Post
{

    public function beforeExecute(
        \Magento\Contact\Controller\Index\Post $subject
    ) {
        $comment =  $subject->getRequest()->getParam('comment', false);
        $subject->getRequest()->setParam('comment', 'testing: '.$comment);
        return;
    }
}