How to override Quick Order model

Question

I'm working on a Magento 2.2.3 B2B, with the Quick Order feature enabled, and I can't find a way to extend a method of the Magento\QuickOrder\Model\Cart model.

So far I tried the usual: MyCompany/MyModule/etc/di.xml:

<preference for="Magento\QuickOrder\Model\Cart"
    type="MyCompany\MyModule\Model\Cart"/>

and then in MyCompany\MyModule\Model\Cart.php:

<?php
namespace MyCompany\MyModule\Model;

class Cart extends \Magento\QuickOrder\Model\Cart
{
    protected function _addAffectedItem($item, $code)
    {
        // My extended code
    }
}

But it's not working. I also tried using a plugin, but for some reason my code is being ignored. Any ideas of what's going on with this Model?

Thanks in advance

Answer 1

Use before methods if you want your code to be executed first. Just follow along this documentation: https://devdocs.magento.com/guides/v2.3/extension-dev-guide/plugins.html