Example of extending fields definition.

CustomerMap.php

<?php
 
namespace YourApp\Shop;
 
use YourApp\Shop\Base\CustomerMap as BaseCustomerMap;
use Pomm\Exception\Exception;
use Pomm\Query\Where;
 
class CustomerMap extends BaseCustomerMap
{
    public function getSelectFields($alias = null)
    {
        $fields = parent::getSelectFields($alias);

        unset($fields['password']);
        $fields['age'] = sprintf("age(%s)", $this->aliasField('birthdate', $alias));

        return $fields;
    }
}