Codeigniter & HMVC - Callback not working - codeigniter

Question

I've pretty much gone through a lot of link and solutions provided here and other locations, but I am just not able to solve the callback issue that I am facing. I'm using Codeigniter with HMVC the code is below.
The following code is from My_Form_validation.php:
class MY_Form_validation extends CI_Form_validation {
function run($module = '', $group = ''){
(is_object($module)) AND $this->CI = &$module;
return parent::run($group);
}
}
Below if the Callback function :
public function _unique_email($str) {
// Check if user already exists
// Process only for current user
$id = $this->uri->segment(4);
$this->db->where('email', $this->input->post('email'));
!$id || $this->db->where('id !=', $id);
$user = $this->mdl_admin_users->get();
if (count($user)) {
$this->form_validation->set_message('_unique_email', 'User already exists. Please check %s.');
return FALSE;
}
return TRUE;
}
and the function :
public function user_edit($id = NULL) {
// Fetch a user or set a new one
if ($id) {
$data['user'] = $this->mdl_admin_users->get($id);
count($data['user']) || $data['errors'][] = 'User could not be found';
}
else {
$data['user'] = $this->mdl_admin_users->get_new();
}
// setup the form
$rules = $this->mdl_admin_users->rules_admin;
$id || $rules['password'] = '|required';
$this->form_validation->set_rules($rules);
//process the form
if ($this->form_validation->run($this) == TRUE) {
$data = $this->mdl_admin_users->array_from_post(array('firstname', 'lastname', 'email', 'password'));
$data['password'] = $this->mdl_admin_users->hash($data['password']);
$this->mdl_admin_users->save($data, $id);
redirect('admin/user');
}
// Load the view
$data['title'] = 'Edit Users';
$data['module'] = 'admin';
$data['header_file'] = 'header_admin';
$data['nav_file'] = 'nav_admin';
$data['view_file'] = 'edit_users';
$data['footer_file'] = 'footer_admin';
echo Modules::run('template/base_template', $data);
}
Would be a great help if someone could point me at the right direction to resolve the issue. Thanks in advance
Naveen

Answer 1

According to wiredesignz,
When using form validation with MX you will need to extend the CI_Form_validation class as shown below,
/** application/libraries/MY_Form_validation **/
class MY_Form_validation extends CI_Form_validation
{
public $CI;
}
before assigning the current controller as the $CI variable to the form_validation library. This will allow your callback methods to function properly.
class Xyz extends MX_Controller
{
function __construct()
{
parent::__construct();
$this->load->library('form_validation');
$this->form_validation->CI =& $this;
}
}
This will remove HMVC related callback problem without any changes to your code.

Answer 2

First of you are missing in the rules
$rules['email'] = 'required|callback__uniqueemail';
Also call back function should be not like this callback__unique_email for some reason I found codeigniter call back not like extra gap this better callback__uniqueemail
If private do not work make public function removing underscore
public function uniqueemail() // no need $str
When make public do not for get to remove extra underscore from here callback_uniqueemail
Another thing with echo Modules run best to be loaded from view only.
In your controller replace echo Modules run with $this->load->view();
You need to add $this->form_validation->run($this) add $this to run after create library below.
And Create a new library
<?php
class MY_Form_validation extends CI_Form_validation {
function run($module = '', $group = '') {
(is_object($module)) AND $this->CI = &$module;
return parent::run($group);
}
}
Tutorial Best https://www.youtube.com/watch?v=8fy8E_C5_qQ