doctrine2/models/gnatUser.php

<?php 
class gnatUserTable { }

class gnatUser extends Doctrine_Record 
{
    public function setTableDefinition() 
    {
        $this->hasColumn('name', 'string', 150);
        $this->hasColumn('foreign_id', 'integer', 10, array ('unique' => true,));
    }
    
    public function setUp()
    {
        parent::setUp();
        $this->hasOne('gnatEmail as Email', array('local'=> 'foreign_id', 'foreign'=>'id', 'onDelete'=>'CASCADE'));
    }
    
}