SimpleSource.php

<?php

declare (strict_types=1);
namespace Plugin\migrate\source;

use Drupal\migrate\Plugin\migrate\source\SqlBase;
use Drupal\Core\Database\Query\SelectInterface;

/**
 * Simple source for testing changing configuration.
 *
 * @MigrateSource(
 *   id = "simple_source",
 * )
 */
class SimpleSource extends SqlBase {
    
    /**
     * {@inheritdoc}
     */
    public function query() : SelectInterface {
        return $this->select('source_table', 's')
            ->fields('s', [
            'id',
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function fields() : array {
        return [
            'foo' => $this->t('Test field.'),
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getIds() : array {
        return [
            'foo' => [
                'type' => 'string',
            ],
        ];
    }

}