zf2 tablegateway select columns with join table - php

Question

I have this code (which works fine):
Class SsoRequserTable
public function fetchAll()
{
$select = new Select();
$select->from("sso_requser");
$select->join('sso_workunit', 'sso_workunit.sso_workunit_id = sso_requser.sso_workunit_id', array("unitname"), 'left');
echo $select->getSqlString();
$result = $this->tableGateway->selectWith($select);
return $result;
}
class SsoRequser
class SsoRequser{
public $sso_requser_id;
public $firstname;
public $lastname;
public $fullname;
public $sso_workunit_id;
public function exchangeArray($data){
$this->sso_requser_id = (!empty($data['sso_requser_id'])) ? $data['sso_requser_id'] : null;
$this->firstname = (!empty($data['firstname'])) ? $data['firstname'] : null;
$this->lastname = (!empty($data['lastname'])) ? $data['lastname'] : null;
$this->fullname = (!empty($data['fullname'])) ? $data['fullname'] : null;
$this->sso_workunit_id = (!empty($data['sso_workunit_id'])) ? $data['sso_workunit_id'] : null;
}
}
Module.php
public function getServiceConfig() {
return array(
'invokables' => array(
// 'Aclplugin' => 'Auth\Controller\Plugin\Aclplugin',
),
'factories' => array('SSO\Model\SsoRequserTable' => function($sm) {
$tableGateway = $sm->get('SsoRequserTableGateway');
$table = new SsoRequserTable($tableGateway);
return $table;
},
'SsoRequserTableGateway' => function ($sm) {
$dbAdapter = $sm->get('postgresql_adapter');
$resultSetPrototype = new HydratingResultSet();
$resultSetPrototype->setObjectPrototype(new SsoRequser());
return new TableGateway('sso_requser', $dbAdapter, null, $resultSetPrototype);
},
),
);
}
But I can`t get the sso_workunit columns to work. I have read the Zend Documentation and nothing effectively worked for me. I need name to have an alias "unitname".
And i got the message error "Undefined property: SSO\Model\Entity\SsoRequser::$unitname "
Whether I should add unitname in class SsoRequser ?
Anyone can help me ?