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VirtualSelect

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Description

The use of dependency injection in Magento makes it especially easy to work with data from di.xml. However, it is still so commonplace to see hardcoded data in backend source_model classes, which amounts to a bunch of duplicated classes containing disparate data. Unifying the data in di.xml makes it easier to maintain and update throughout the lifetime of the module.

An elegant approach to creating select source_model classes with populated data is to create a generic class that implements ArrayInterface, and use the power of the <virtualType> to set the options dynamically.

Usage

<?xml version="1.0"?>
<!--
/**
 * system.xml
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <tab id="vendor" translate="label" sortOrder="100">
            <label>Vendor, Inc.</label>
        </tab>
        <section id="package" translate="label" sortOrder="100"
                 showInDefault="1" showInWebsite="1" showInStore="1">
            <class>separator-top</class>
            <label>Package</label>
            <tab>vendor</tab>
            <group id="general" translate="label" type="text" sortOrder="10"
                   showInDefault="1" showInWebsite="1" showInStore="1">
                <label>General Settings</label>
                <field id="default_status" translate="label" type="select" sortOrder="10"
                       showInDefault="1" showInWebsite="1" showInStore="1">
                    <label>Default Status</label>
                    <!-- The <virtualType> class -->
                    <source_model>Vendor\Package\Model\Source\Select\Status</source_model>
                </field>
            </group>
        </section>
    </system>
</config>

Source

<?php
/**
 * Generic.php
 */
declare(strict_types=1);

namespace Vendor\Package\Model\Source\Select;

use Magento\Framework\Option\ArrayInterface;

class Generic implements ArrayInterface
{
    /** @property array $options */
    protected $options = [];

    /**
     * @param array $data
     * @return void
     */
    public function __construct(array $data = [])
    {
        /* Inverts KV for array_walk. */
        $data = array_flip($data);

        array_walk(
            $data,
            [
                $this,
                'setOption'
            ]
        );
    }

    /**
     * @param int|string|null $value
     * @param int|string $key
     * @return void
     */
    protected function setOption($value, $key): void
    {
        $this->options[] = [
            'label' => __($key),
            'value' => $value,
        ];
    }

    /**
     * @return array
     */
    public function toOptionArray()
    {
        return $this->options;
    }
}
<?xml version="1.0"?>
<!--
/**
 * di.xml
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <virtualType name="Vendor\Package\Model\Source\Select\Status"
                 type="Vendor\Package\Model\Source\Select\Generic">
        <arguments>
            <argument name="data" xsi:type="array">
                <item name="pending" xsi:type="string">Pending</item>
                <item name="closed" xsi:type="string">Closed</item>
                <item name="open" xsi:type="string">Open</item>
                <item name="on_hold" xsi:type="string">On Hold</item>
            </argument>
        </arguments>
    </virtualType>
</config>