How to override a Model in Magento 2

In this short tutorial I will show you how to override a Model in Magento 2 and also an alternative to rewriting introduced in Magento 2.

I assume you already have a new module created where you will write your customizations. If not here is a tutorial on how to create a new module in Magento 2.

Write a preferrence

For this tutorial let’s rewrite the Quote model found here Magento\Quote\Model\Quote.

In your custom module create the file <Vendor>/<Module>/etc/di.xml if you don’t have it already.

<?xml version="1.0" encoding="UTF-8"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
   <preference for="Magento\Quote\Model\Quote" type="Vendor\Module\Model\Quote"/>
</config>

Here we defined a preference, for attribute it’s the class we want to rewrite and type attribute represents the new class we create.

Extend the Model

Now let create our new class that extends Magento\Quote\Model\Quote.

Create the file <Vendor>/<Module>/Model/Quote.php

<?php 
namespace Vendor\Module\Model;
 
class Quote extends \Magento\Quote\Model\Quote
{
 
//write your customizations here
 
}

That’s how simple it is to override a Model in Magento 2. Let’s look at the alternative.

An alternative to not override a model in Magento 2

The alternative to rewriting it is by using plugins. Please check the documentation here on how to use and create plugins. They are something introduced in version 2 of Magento.

You can check all my Magento 2 tutorials here.