Magento 2 plugin not calling the around function

Question

I created a small module which has a plugin. This plugin must exchange a method with my own.

But my plugin is never being called.

I have been staring at this for a few hours. Can anyone help me with this?

/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">
    <type name="Magento\CatalogSearch\Model\Indexer\Fulltext\Action\DataProvider">
        <plugin disabled="false"
                name="Custom_ConfigurableChildSearch_DataProvider"
                sortOrder="10"
                type="Custom\ConfigurableChildSearch\Plugin\DataProvider"/>
    </type>
</config>

/Plugin/DataProvider.php:

<?php

namespace Custom\ConfigurableChildSearch\Plugin;

class DataProvider
{
    /**
     * @param \Magento\CatalogSearch\Model\Indexer\Fulltext\Action\DataProvider $subject
     * @param \Closure                                                          $proceed
     *
     * @param                                                                   $indexData
     * @param                                                                   $productData
     * @param                                                                   $storeId
     */
    public function aroundPrepareProductIndex(\Magento\CatalogSearch\Model\Indexer\Fulltext\Action\DataProvider $subject, \Closure $proceed, $indexData, $productData, $storeId)
    {
        var_dump('test');
        exit;

    }
}

Answer 1

Things to try when your plugins aren't being called.

Inserting die('loaded plugin') temporarily in your plugin and die('loaded method') in the original method (or using debugger breakpoints) is a good idea.

1: Clear the generated files (fast, good for a quick check if your module has already been registered with #2)

rm -rf generated/*

2: Clear all caches and generated dirs, and register new modules. (slow, but basically refreshes everything)

 php bin/magento setup:upgrade        

3: Regenerate the di code. (slow, but can find issues in your code that the other methods don't)

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

Usually, #1 works, if not, try #2, then #3. If none of those work, check that your module's di.xml lines up with your modules (in the original post, it seems to).

Double-check that filepaths correspond with class names, and that case matches.

Official documentation for plugins is here: https://devdocs.magento.com/guides/v2.3/extension-dev-guide/plugins.html

Answer 2

Did you run setup:di:compile after defining your plugin?

Take a look at Magento 2 Docs Code Compiler

and at: Magento2 - setup:di:compile + Magento 2: When should I run which commands?

According to that you have to run that command if you changed something in your di.xml files.