FuelPHP Forums

Hello I am new in fuelphp. My prior framework is code igniter. Code igniter has very great documentation, so easily learning. I am moving to fuelphp because code igniter is not development again. But in fuel php I have one problem about callback validation. In code igniter is very easy to implement custom validation like the documentation
class Form extends CI_Controller {
public function index()
{
$this->load->helper(array('form', 'url'));
$this->load->library('form_validation');
$this->form_validation->set_rules('username', 'Username', 'callback_username_check');
if ($this->form_validation->run() == FALSE)
{
$this->load->view('myform');
}
else
{
$this->load->view('formsuccess');
}
}

public function username_check($str)
{
if ($str == 'test')
{
$this->form_validation->set_message('username_check', 'The %s field can not be the word "test"');
return FALSE;
}
else
{
return TRUE;
}
}
}
?>
In fuelPHP, I have read documentation but still confuse. I am try this
class MyRules
{
// note this is a static method
public static function _validation_username_chek($strusername)
{
if ($strusername=="tes") {

return 1;

} else {
return 2;
}
}
}

$val->add_callable('MyRules');
$val->add('username', 'Your username', array(), array('trim'))->add_rule('username_chek');
But get error InvalidArgumentException [ Error ]: Input for add_callable is not a valid object or class.
Can anyone help me to solve this…please give me example like code igniter documentation above..