Problemas con login con rol en codeigniter

[warbandit69]

Buenas a todos, gracias por leer mi post, tengo el siguiente problema al crear una cuenta de usuario (estoy siguiendo unos tutoriales en video de nettus)



Acá mi controlador (login.php)

Código PHP:

  <?php
class Login extends CI_Controller {
    
    function index()
    {
        $data['main_content'] = 'login_form';
        $this->load->view('includes/template', $data);
    }
    
    function validate_credentials()
    {
        $this->load->model('membership_model');    
        $query = $this->membership_model->validate();
        
        if ($query) //Existe el usuario
        {
            $rol = $this->membership_model->roles($this->input->post('username')); //Busco el rol en el modelo
            $data = array(
                'username' => $this->input->post('username'),
                'rol' => $rol,
                'is_logged_in' => true
            );    
            
            $this->session->set_userdata($data);
            redirect('site/members_area');
        }
        else 
        {
            $this->index();    
        }
    }
    
    function signup()
    {
        $data['main_content'] = 'signup_form';
        $this->load->view('includes/template', $data);
    }
    
    function create_member()
    {
        $this->load->library('form_validation');
        //field name, error message, validation rules
        
        $this->form_validation->set_rules('first_name', 'First Name', 'trim|required');
        $this->form_validation->set_rules('last_name', 'Last Name', 'trim|required');
        $this->form_validation->set_rules('email_address', 'Email Address', 'trim|required|valid_email');    
        
        $this->form_validation->set_rules('username', 'Username', 'trim|required|min_lenght[4]');
        $this->form_validation->set_rules('password', 'Password', 'trim|required|min_lenght[4]|max_lenght[32]');
        $this->form_validation->set_rules('password2', 'Password Confirmation', 'trim|required|min_lenght[4]|max_lenght[32]|matches[password]');
        
        if (($this->form_validation->run()) == FALSE)
        {
            $this->signup();
        }
        else 
        {
            $this->load->model('membership_model');    
            if ($query = $this->membership_model->create_member)
            {
                $data['main_content'] = 'signup_succesful';
                $this->load->view('includes/template', $data);
            }
            else
            {
                $this->load->view('signup_form');    
            }
        }
    }
}
?>   

Acá el modelo (membership_model.php)

Código PHP:

  <?php
class Membership_model extends CI_Model {
    
    function validate()
    {
        $this->db->where('username', $this->input->post('username'));
        $this->db->where('password', md5($this->input->post('password')));
        $query = $this->db->get('membership');
        
        if($query->num_rows == 1)
        {
            return true;    
        }
    }
    
    function roles($usuario)
    {
        $sql = "SELECT roles FROM membership WHERE username = ? LIMIT 1";
        $q = $this->db->query($sql, $usuario);    
        if ($q->num_rows() > 0)
        {
            foreach($q->result() as $row) {
                $data = $row;
            }
            return $data;
        }
    }
    
    function create_member()
    {
        $new_member_insert_data = array(
            'first_name' => $this->input->post('first_name'),
            'last_name' => $this->input->post('last_name'),
            'username' => $this->input->post('username'),
            'password' => md5($this->input->post('password')),
            'email_address' => $this->input->post('email_address'),
            'roles' => '1'
        );    
        
        $insert = $this->db->insert('membership', $new_member_insert_data);
        return $insert;
    }
    
}
?>   

Y acá la vista (signup_form.php)

Código PHP:

 <h1>Create an Account</h1>
<fieldset>
    <legend>Personal Information</legend>
    <?php
        echo form_open('login/create_member');
        echo form_input('first_name', set_value('first_name', 'First Name'));
        echo form_input('last_name', set_value('last_name', 'Last Name'));
        echo form_input('email_address', set_value('email_address', 'Email Address'));
    ?>
</fieldset>
<fieldset>
    <legend>Login Info</legend>
    <?php
        echo form_input('username', set_value('username', 'Username'));
        echo form_input('password', set_value('password', 'Password'));
        echo form_input('password2', set_value('password2', 'Password Confirm'));
        
        echo form_submit('submit','Create Account');
    ?>
    
    <?php echo validation_errors("<p class='error'>"); ?>
</fieldset>