ProfileFieldOptionTranslation.php

<?php

namespace Drupal\user\Plugin\migrate\source\d6;

use Drupal\user\Plugin\migrate\source\ProfileField;

// cspell:ignore nprofile objectid

/**
 * Drupal 6 i18n profile field option labels source from database.
 *
 * For available configuration keys, refer to the parent classes.
 *
 * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
 * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
 *
 * @MigrateSource(
 *   id = "d6_profile_field_option_translation",
 *   source_module = "i18nprofile"
 * )
 */
class ProfileFieldOptionTranslation extends ProfileField {

  /**
   * {@inheritdoc}
   */
  public function query() {
    $query = parent::query();
    $query
      ->fields('i18n', [
      'property',
      'objectid',
    ])
      ->fields('lt', [
      'translation',
      'language',
    ])
      ->condition('i18n.type', 'field')
      ->condition('property', 'options');
    $query
      ->leftJoin('i18n_strings', 'i18n', '[pf].[name] = [i18n].[objectid]');
    $query
      ->innerJoin('locales_target', 'lt', '[lt].[lid] = [i18n].[lid]');
    return $query;
  }

  /**
   * {@inheritdoc}
   */
  public function fields() {
    return parent::fields() + [
      'property' => $this
        ->t('Option ID.'),
      'objectid' => $this
        ->t('Field name'),
      'language' => $this
        ->t('Language for this field.'),
      'translation' => $this
        ->t('Translation of either the title or explanation.'),
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function getIds() {
    return parent::getIds() + [
      'language' => [
        'type' => 'string',
      ],
      'property' => [
        'type' => 'string',
      ],
    ];
  }

}