How to override a method in a vendor module?

Question

Hi so i wrote this code to override a method in the woom cmstree module. But it seems like, something is wrong and i have used an entire day to figure it out, without any success.

My Vendor/MyModule/Block/Widget/Children.php

<?php

namespace Vendor\MyModule\Block\Widget;

class Children extends \Woom\CmsTree\Block\Widget\Children

{

protected $belongsToMenu = "";

public function prepareLinks($treeChildren, $first = false)
{
    $html = '';

    some random code

    return $html;
}
}

My etc/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">
    <preference for="Woom\CmsTree\Block\Widget\Children" type="Vendor\MyModule\Block\Widget\Children" />
</config>

So this is how i did it. And i of course got the registration file and module.xml

But when i go to the page where this widget is used i get this error

[2021-03-04 20:56:22] main.CRITICAL: Error: Class 'Vendor\Mymodule\Block\Widget\Children' not found in /home/sonose2/public_html/generated/code/Vendor/Mymodule/Block/Widget/Children/Interceptor.php:7

I have been look at some examples but the are exact as mine and i have been trying alot of other stuff and now i ran out of ideas what to do.

Answer 1

It looks like your class hasn't been generated by the Magento core code. I think you need to run these three commands to generate it:

php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento cache:flush

Furthermore I would suggest you to look into plugins for modifying preexisting classes instead of using preferences in your di.xml file. The reason for this is that sometimes multiple preferences for the same class can cause conflicts and therefore issues.

Answer 2

1)Create di.xml file and add following code:

<config>
    <type name="Magento\Catalog\Api\Data\ProductInterface">
        <plugin name="inchoo_catalog_product" type="Inchoo\Catalog\Plugin\Model\Product" />
    </type>
</config>

2)Create a class in plugin folder:

<?php
namespace vendor\module\Plugin\Model;
 
class Product
{
    public function beforeSetPrice(\Magento\Catalog\Model\Product $subject, $price)
    {
        $price += 10;
        return [$price];
    }
}

Answer 3

There wasn't anything wrong with this code. The only thing i did to make it work was to remove it entirely from the magento and added it again.