Form Validation - Callback to a Model?

Hello Zeff,

at the moment I extend the CI_Form_validation which make it possible to access the is_unique_email method:

PHP Code:

<?php defined('BASEPATH') OR exit('No direct script access allowed');
class MY_Form_validation extends CI_Form_validation
{    
    public function is_unique_email($value)
    {
        return $this->CI->User_model->is_unique_email($value);
    }
} 


form_validation.php:

PHP Code:

<?php
$config = array
{
    'error_prefix' => '',
    'error_suffix' => '',
    'create_user' => array
    {
        array
        (
            'field'     => 'email',
            'label'     => 'E-Mail',
            'rules'     => 'trim|required|max_length[70]|valid_email|is_unique_email'
        ),
    },
} 


But I don't unterstand how I can call model method from this rule config array directly.