Customising Categories

If your store uses a customized logic for handling product's categories you might need to amend categories in Nosto module as well . Start by reading how to extend Nosto module and how to alter Nosto product data.

If overriding the product data directly does not seem the best option for you, you can create a service class and make use of Dependency Injection pattern.

Create a new class which will implement CategoryServiceInterface. Override the required functions and afterwards replace CategoryServiceInterface with MyCategoryServive in the DI etc/di.xml

File app/code/My/Nosto/Model/Service/MyCategoryServive.php

<?php

namespace My\Nosto\Model\Service;

use Nosto\Tagging\Model\Service\Product\Category\CategoryServiceInterface;
use Magento\Catalog\Model\Category;
use Magento\Catalog\Model\Product;
use Magento\Store\Api\Data\StoreInterface;

class MyCategoryServive implements CategoryServiceInterface
{   

    /**
     * Method used to return a single category string for given category object
     * @param Category $category
     * @param StoreInterface $store
     * @return null|string
     */
    public function getCategory(Category $category, StoreInterface $store) {
        //ToDo Implement logic    
    }   

    /**
     * Method used to return list of strings representing categories for a given product 
     * @param Product $product
     * @param StoreInterface $store
     * @return array
     */
    public function getCategories(Product $product, StoreInterface $store) {

    }   
}

File app/code/My/Nosto/etc/di.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <preference for="Nosto\Tagging\Model\Service\Product\Category\CategoryServiceInterface" type="My\Nosto\Model\Service\MyCategoryServive"/>
</config>