FuelPHP Forums

I already viewed this link http://fuelphp.com/forums/discussion/13255/primary-keys-with-different-id-name
but not found the answer.
I want to know it's possible or not to use ORM default id as my custom id (admin_id).
When I run this command in oil console "Model_Admin_Account::find(2)->to_array();" I know ORM find search 2 by id. I want to use it with my own admin_id.
If there have to change in ORM configure, please could you tell me how to do?

My Model is in below, I want to remove 'id'.

<?php

class Model_Admin_Account extends \Orm\Model
{
    protected static $_properties = array(
        'id',
        'admin_id',
        'admin_code',
        'super_admin_code',
        'admin_name',
        'admin_password',
        'admin_is_enabled',
        'admin_is_delete',
        'admin_delete_date',
        'admin_create_date',
        'admin_update_date',
    );