As we saw in the introduction of this chapter, sometimes hooks are not sufficient to meet the needs of developers; hooks can't alter the default process of PrestaShop. We could add code to core classes; however, it is not recommended, as all those core changes will be erased when PrestaShop is updated using the autoupgrade module (even a manual upgrade would be difficult). That's where overrides take the stage.
Installing new object models and controller overrides on PrestaShop is very easy.
To do so, you have to create an override directory in the root of your module's directory. Then, you just have to place your override files respecting the path of the original file that you want to override. When you install the module, PrestaShop will automatically move the override to the overrides directory of PrestaShop.
In our case, we will override the getProducts method of the /classes/Search.php class to display the grade and the number...
