Session empty codeigniter

Question

First, sorry for my english :D

I try to make a simple login on Codeigniter without succes. I read the official documentation and reduce the script to minimum necessary. My session is empty every time i redirect o refresh my page or if i going to another controller. If i create only one controller and make simple read and write it is going well until i refresh or redirect.

This is what I want to do: 1) first controller is main controller. Load a view with a login form. This form has a action to method validation_form and then username_check callback.

2) if the user was able to logged in, i set my userdata and redirect to restriced controller, that is my restricted area.

P.S. i use library session in autoload with the option database active. I have database library in autoload too.

MAIN CONTROLLER

class Main extends CI_Controller {


public function __construct(){
    parent::__construct();

}

public function index()
{
    $this->load->view('login_view');
}

public function validation_form()
{
    $this->load->library('form_validation');
    $this->form_validation->set_rules('email', 'Email', 'required|callback_username_check');
    if ($this->form_validation->run() == FALSE){
       echo 'validation_error';
    }else{
       redirect('/restricted');
    }
}

public function username_check(){
    $this->load->model('login_model');
    $email=$this->input->post('email');
    $login=$this->login_model->validate($email);
    if ($login != FALSE){                    
                return true;
    }
    return false;
}

}

LOGIN MODEL

class Login_model extends CI_Model{

public function __construct(){
    parent::__construct();
}

 public function validate($email){

    // Prep the query
    $this->db->where('EmailDatore', $email);

    // Run the query
    $query = $this->db->get('Datore');
    // Let's check if there are any results
    if($query->num_rows() == 1)
    {
        // If there is a user, then create session data
        $row = $query->row();
        $data = array(
                'email' => $row->EmailDatore,
                'nome' => $row->Nome,
                'cognome' => $row->Cognome,                    
                'validated' => true
                );
        $this->session->set_userdata($data);
        return true;
    }
    // If the previous process did not validate
    // then return false.
    return false;
}

}

RESTRICTED CONTROLLER class Restricted extends CI_Controller{

 public function __construct(){
    parent::__construct();
    $this->check_isvalidated();
}

public function index(){
    // If the user is validated, then this function will run
    echo 'Congratulations, you are logged in.';
}

private function check_isvalidated(){
    if(! $this->session->userdata('validated')){
        redirect('main');
    }
}

}

Answer 1

I think the callback function can be like this too.

public function username_check($str){
   $this->load->model('login_model');
   $login=$this->login_model->validate($str);
   if ($login != FALSE){                    
            return true;
   }
return false;

Is your code reaching the model or is it failing the callback? Which parts of the code is it not reaching? Place vardump(); or die(); to check.

Answer 2

Typo in the model, not sure if there are other errors but there was this one at least, meaning you never complete your success code.

 if($query->num_rows() == 1)

Edit - error here too, you're passing $data but population $email. Therefore the model is getting an empty string.

public function username_check(){
$this->load->model('login_model');
$email=$this->input->post('email');
$login=$this->login_model->validate($email);
if ($login != FALSE){                    
            return true;
}
return false;
}