SimpleSource.php

<?php

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

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

/**
 * Simple source for testing changing configuration.
 */
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',
      ],
    ];
  }

}