Custom SetPropertyUsingEel transformation for Neos CMS Node Migrations

SetPropertyUsingEel.php

<?php

namespace My\FoobarCom\Migration\Transformations;

use Neos\Flow\Annotations as Flow;
use Neos\ContentRepository\Domain\Factory\NodeFactory;
use Neos\ContentRepository\Domain\Service\ContextFactory;
use Neos\ContentRepository\Domain\Model\NodeData;
use Neos\ContentRepository\Migration\Transformations\AbstractTransformation;
use Neos\Eel\EelEvaluatorInterface;
use Neos\Eel\Utility;

/**
 * Set a property to the value evaluated by an EEL expression
 */
class SetPropertyUsingEel extends AbstractTransformation
{
    /**
     * @var array
     * @Flow\InjectConfiguration(path="defaultContext", package="Neos.Fusion")
     */
    protected $defaultContextConfiguration;

    /**
     * @var EelEvaluatorInterface
     * @Flow\Inject(lazy=false)
     */
    protected $eelEvaluator;

    /**
     * @var ContextFactory
     * @Flow\Inject
     */
    protected $contextFactory;

    /**
     * @var NodeFactory
     * @Flow\Inject
     */
    protected $nodeFactory;

    /**
     * @var string
     */
    protected $propertyName;

    /**
     * @var string
     */
    protected $value;

    /**
     * Sets the name of the new property to be added.
     *
     * @param string $propertyName
     * @return void
     */
    public function setPropertyName($propertyName)
    {
        $this->propertyName = $propertyName;
    }

    /**
     * Property value to be set.
     *
     * @param string $value
     * @return void
     */
    public function setValue($value)
    {
        $this->value = $value;
    }

    /**
     * @param NodeData $node
     * @return boolean
     */
    public function isTransformable(NodeData $node)
    {
        return true;
    }

    /**
     * Add the new property with the given value on the given node.
     *
     * @param NodeData $nodeData
     * @return void
     * @throws \Neos\ContentRepository\Exception\NodeConfigurationException
     * @throws \Neos\Eel\Exception
     */
    public function execute(NodeData $nodeData)
    {
        $context = $this->contextFactory->create(
            [
                'workspaceName' => 'live',
                'invisibleContentShown' => true,
                'removedContentShown' => true,
                'inaccessibleContentShown' => true
            ]
        );
        $node = $this->nodeFactory->createFromNodeData($nodeData, $context);
        $contextProperties = [
            'workspaceName' => 'live',
            'node' => $node,
            'invisibleContentShown' => true,
            'removedContentShown' => true,
            'inaccessibleContentShown' => true
        ];
        $value = Utility::evaluateEelExpression(
            $this->value,
            $this->eelEvaluator,
            $contextProperties,
            $this->defaultContextConfiguration
        );
        $nodeData->setProperty($this->propertyName, $value);
    }
}

Version1234567890.yaml

up:
  comments: 'Migrates NodeType to NodeType'
  warnings: 'There is no way of reverting this migration.'
  migration:
    -
      filters:
        -
          type: 'NodeType'
          settings:
            nodeType: 'My.FoobarCom:NodeTypeToMigrate'

      transformations:
        -
          type: 'My\FoobarCom\Migration\Transformations\SetPropertyUsingEel'
          settings:
            propertyName: 'title'
            value: "${node ? q(node).find('[instanceof My.FoobarCom:SomeNodeType]').count() > 0 ? q(node).find('[instanceof My.FoobarCom:SomeNodeType]').first().property('text') : '' : ''}"
down:
  warnings: 'There is no way of reverting this migration.'