How to set the logged in user ID on a session (CodeIgniter)?

I am having trouble, getting the logged in user ID from the database...

This is my controller code :

        function validation(){

    $this->load->model('users_model');
    $query = $this->users_model->validate();

    if ($query){
        $this->users_model->get_userID($this->input->post('email'));
        $data = array( 
        'email' => $this->input->post('email'),
        'is_logged_in' => true,
        'user_id' => $user_id
        );

开发者_如何学JAVA        $this->session->set_userdata($data);            
        redirect('home');
    }
    else {
        $this->index();
    }
}

This is my model function where I return the user id from the database:

       function get_userID($email){
    $this->db->where('email',$email);
    $query = $this->db->get('users');       
    foreach ($query->result() as $row)
        {
            $user_id = $row->id;
        }
        return $user_id;

}

Everything works perfect, except that $user_id returns empty... What am I doing wrong?

Try:

$user_id= $this->users_model->get_userID($this->input->post('email'));

try modifying the model function to this -

function get_userID($email){
  $this->db->where('email',$email);
  $query = $this->db->get('users')->row_array(); // retrieves only first-row.
  return $query['id'];
}

In controller the function needs just a bit of modification as follows -

function validation(){

    $this->load->model('users_model');
    $query = $this->users_model->validate();

    if($query){
        //$user_id was not assigned before :)
        $user_id = $this->users_model->get_userID($this->input->post('email')); 
        $data = array( 
        'email' => $this->input->post('email'),
        'is_logged_in' => true,
        'user_id' => $user_id
        );

        $this->session->set_userdata($data);            
        redirect('home');
    }
    else {
        $this->index();
    }
}

hope it helps,

faisal ahmed blog / site