public function loadAllLocationsWithGroupExId() {
    $mapping_ids = $this->queryFactory
      ->get('mapping')
      ->condition('type', self::TYPE)
      ->condition('field_groupex_id', 0, '>')
      ->sort('name', 'ASC')
      ->execute();
    if (!$mapping_ids) {
      return [];
    }

    return $this->storage->loadMultiple($mapping_ids);
  }