Why does the query return a column and not a row and at the same time display only the very first character from the cell?

Question

opencart

Controller:

foreach($this->model_extension_module_track->getCustomer($code) as $result){
    $data['customers'][] = array(
        'id' => $result['id']
     );
}

Model:

class ModelExtensionModuleTrack extends Model {
  public function getCustomer($customer_id) {
    $query = $this->db->query("SELECT DISTINCT * FROM `oc_customers_track` WHERE `id` = '" . (int)$customer_id . "'");

    return $query->row;
  }
}

SQL Table:


Result:

Answer 1

It turned out the problem is that I returned one line

- return $query->row;

+ return $query->rows;