[Solved] Can't use method return value in write context

[eluser]riwakawd[/eluser]
[quote author="InsiteFX" date="1402147925"]

Code:

// $this->session->set_userdata($newdata); Now look at your code below!

$this->session->set_userdata('user_id') = $user_query->row('user_id');

[/quote]

I think I all most got it just trying now to get it redirect working.

Code:

public function index() {
  $this->ControllerCommonLogin();
   }

   public function ControllerCommonLogin() {

      $this->form_validation->set_rules('username', 'Username', 'trim|required|xss_clean');
      $this->form_validation->set_rules('password', 'Password', 'trim|required|xss_clean|callback_checkinfo');

      $data['title'] = $this->lang->line('heading_title');
      $data['action'] = site_url('backend/login');

      if($this->form_validation->run($this) == FALSE) {
        $this->load->view('template/common/login', $data);
      } else {
        redirect('dashboard');
      }
    
   }

   public function validate($password) {
      $username = $this->input->post('username');

       //query the database
      $result = $this->user_model->login($username, $password);

      if($result) {
        
         $sess_array = array();
         foreach($result as $row){
         $sess_array = array(
         'user_id' => $row->id,
         'username' => $row->username,
         'ip' => $row->ip
         );

         $this->session->set_userdata('isLogged', $sess_array);
      }
         return TRUE;
      } else {
         $this->form_validation->set_message('checkinfo', 'Invalid username or password');
         return false;
      }
   }
  
}

Model

Code:

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class User_model extends CI_Model {

private $user_id;
private $username;
private $permission = array();

public function __construct() {
  parent::__construct();
  if(!empty($this->session->userdata('user_id'))) {

  $user_query = $this->db->query("SELECT * FROM " . $this->input->post('db_prefix') . "user WHERE user_id = '" .$this->session->userdata('user_id') . "' AND status = '1'");

  if($user_query->num_rows > 0) {
      $this->user_id = $user_query->row('user_id');
      $this->username = $user_query->row('username');
      $this->db->query("UPDATE " . $this->input->post('db_prefix') . "user SET ip = '" . $this->input->ip_address()."' WHERE user_id = '" . (int)$this->session->userdata('user_id') . "'");
      $user_group_query = $this->db->query("SELECT * FROM " . $this->input->post('db_prefix')  . "user_group WHERE user_group_id = '" . (int)$query->row('user_group_id') . "'");
      } else {
         $this->logout();
      }
    }
  }


function login($username, $password){
   $this->db->select('user_id, username, password');
   $this->db->from('user');
   $this->db->where('username', $username);
  $this->db->where('password', $this->bcrypt->hash_password($password));
  $user_query = $this->db >get();
  
   if($user_query->num_rows() == 0) {
   return $user_query->result();
    } else {
    return false;
     }
   }


function logout() {
  $this->session->unset_userdata('user_id');

  $this->user_id = '';
  $this->username = '';
}

function isLogged() {
  return $this->user_id;
}

}