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Watch out for Magento’s Generated Classes

astorm

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Magento’s automatic constructor dependency injection system includes features that will automatically generate certain types of classes for you if they don’t already exist.

Here’s an example from Magento’s source

public function __construct(
    ObjectManagerFactory $objectManagerFactory,
    \Magento\Indexer\Model\Indexer\CollectionFactory $collectionFactory = null
) {
    $this->objectManagerFactory = $objectManagerFactory;
    $this->collectionFactory = $collectionFactory;
    parent::__construct();
}

Look high and low, you won’t find a class file for Magento\Indexer\Model\Indexer\CollectionFactory anywhere in Magento’s source repo. That’s because Magento’s object manager generates this factory class on the fly and drops it in the generated folder.

#File: generated//code/Magento/Indexer/Model/Indexer/CollectionFactory.php
<?php
namespace Magento\Indexer\Model\Indexer;

/**
 * Factory class for @see \Magento\Indexer\Model\Indexer\Collection
 */
class CollectionFactory
{
    /**
     * Object Manager instance
     *
     * @var \Magento\Framework\ObjectManagerInterface
     */
    protected $_objectManager = null;

    /**
     * Instance name to create
     *
     * @var string
     */
    protected $_instanceName = null;

    /**
     * Factory constructor
     *
     * @param \Magento\Framework\ObjectManagerInterface $objectManager
     * @param string $instanceName
     */
    public function __construct(\Magento\Framework\ObjectManagerInterface $objectManager, $instanceName = '\\Magento\\Indexer\\Model\\Indexer\\Collection')
    {
        $this->_objectManager = $objectManager;
        $this->_instanceName = $instanceName;
    }

    /**
     * Create class instance with specified parameters
     *
     * @param array $data
     * @return \Magento\Indexer\Model\Indexer\Collection
     */
    public function create(array $data = [])
    {
        return $this->_objectManager->create($this->_instanceName, $data);
    }
}

The Magento dev docs describe the behavior of these factory classes. It’s a nice feature for people who live the Design Patterns lifestyle — lots of boilerplate code automatically generated for you and all your factories behave the same.

Or — all your factories could behave the same. The yak my patron was shaving turned out to be the fault of classes like this.

#File: vendor/magento//module-search/Model/Autocomplete/ItemFactory.php
<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

namespace Magento\Search\Model\Autocomplete;

use Magento\Framework\ObjectManagerInterface;

class ItemFactory
{
    /**
     * @var ObjectManagerInterface
     */
    private $objectManager;

    /**
     * @param ObjectManagerInterface $objectManager
     */
    public function __construct(
        ObjectManagerInterface $objectManager
    ) {
        $this->objectManager = $objectManager;
    }

    /**
     * @param array $data
     * @return Item
     */
    public function create(array $data)
    {
        return $this->objectManager->create(\Magento\Search\Model\Autocomplete\Item::class, ['data' => $data]);
    }
}

For — reasons? — Magento ships with a bunch of actual, non-generated factory classes. For — even more reasons? — some of these factories behave in ways that are subtly different from the generated classes, making it super easy to get tripped up by the behavior of a factory you didn’t write.

One more bit of unexploded ordinance you’ll need to be aware of if you’re doing any sort of non-trivial Magento 2 customizations.

Copyright © Alana Storm 1975 – 2023 All Rights Reserved

Originally Posted: 18th November 2019

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