Fatal error when replacing fuction output with a string using plugin

Question

I'm, learning magento development and trying to create a custom module in Magento 2.3.6 with page at localhost/magento236/lesson3/Page/view

The template file at Lesson3/Module/view/frontend/templates/homepage.phtml calls ViewModel function to output a friend's name from database

<?php
$viewModel = $this->getData('view_model');
$viewModel2 = $block->getViewModel();
echo ($viewModel->getFriendName(1));
?>

ViewModel is located at Lesson3/Module/ViewModel/Lesson3ViewModel.php Part of ViewModel with function to change looks like this

 public function getFriendName($id)
 {
 return $this->getFriendModel($id)->getData('name');
 }

It works fine, shows a name from database with specified ID.

I need to output instead of friend's name any string. So I try to do this with magento plugin interceptor.

Created di.xml at Lesson3/Module/etc/frontend/di.xml

<?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="Lesson3\Module\ViewModel\Lesson3ViewModel">
 <plugin name="Lesson3_Module" type="Lesson3\Module\Model\Plugin"
 sortOrder="1" />
 </type>
</config>

Created plugin class at Lesson3/Module/Model/Plugin.php

<?php 
namespace Lesson3\Module\Model;
class Plugin
{
 public function aftergetFriendName(
 Lesson3\Module\ViewModel\Lesson3ViewModel $product, $name
 ) {
 $name = "TEXT";
 return $name;
 }
}

Executed php bin/magento set:di:compile, ran php bin/magento setup:upgrade anf flushed cache php bin/magento cache:flush.

When accessing the page there is Fatal error: Uncaught TypeError: Argument 1 passed to Lesson3\Module\Model\Plugin::aftergetFriendName() must be an instance of Lesson3\Module\Model\Lesson3\Module\ViewModel\Lesson3ViewModel

Please specify to me what should I have done to make it work

• MOHIT GOHEL: After run php bin/magento set:di:compile run command, If's there is something permission issue like you do 777 permission on the generated folder then check, I hope it's working!
• Fadsa: I have reset Magento and now I'm getting Fatal error

Answer 1

Solved. Should be

 public function aftergetFriendName(
 \Lesson3\Module\ViewModel\Lesson3ViewModel $product, $name
 )

not

 public function aftergetFriendName(
 Lesson3\Module\ViewModel\Lesson3ViewModel $product, $name
 )