Hello all, first approach in codeigniter

[eluser]Unknown[/eluser]
I followed the guide on website [CI 2.1] "the mini-tutorial" that explains how to create news by form, now i want to create the "update" method but i have a difficult with le logic...

my models:

Code:

<?php
#inizio il modello per le news

class News_model extends CI_Model{

public function __construct()
{
  $this->load->database();
}

// prelevo i record dalla tabella
public function get_news($id = FALSE)
{
  if ($id === FALSE)
  {
   $this->db->order_by("title", "asc");
   $query = $this->db->get('news');
   return $query->result_array();
}

$query = $this->db->get_where('news', array('id' => $id));
return $query->row_array();
}

// scivo i record nella tabella
public function set_news()
{
  $this->load->helper('url');
  
  $data = array(
   'title' => $this->input->post('title'),
   'slug' => $this->input->post('slug'),
   'text' => $this->input->post('text')
   );
  
  return $this->db->insert('news', $data);
}

// modifico i record gia esistenti in una tabella
public function update_news($id)
{
  $this->load->helper('url');

  $data = array(
   'title' => $title,
   'slug' => $slug,
   'text' => $text
   );

return $this->db->update('news', $data, array('id' => $id));
}
}

my controller:

Code:

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

#il controller delle news

class News extends CI_Controller {

public function __construct()
{
  parent::__construct();
  $this->load->model('news_model');
}

public function index()
{
$data['news'] = $this->news_model->get_news();
$data['title'] = 'News archive';

$this->load->view('templates/header', $data);
$this->load->view('news/index', $data);
$this->load->view('templates/footer');
}

public function view($id)
{
$data['news_item'] = $this->news_model->get_news($id);

if (empty($data['news_item']))
{
  show_404();
}

$data['title'] = $data['news_item']['title'];

$this->load->view('templates/header', $data);
$this->load->view('news/view', $data);
$this->load->view('templates/footer');
}

// funzione per creare record
public function create()
{
  $this->load->helper('form');
  $this->load->library('form_validation');

  $data['title'] = 'Create a news item';

  $this->form_validation->set_rules('title', 'Title', 'required');
  $this->form_validation->set_rules('text', 'text', 'required');

  if ($this->form_validation->run() === FALSE)
  {
   $this->load->view('templates/header', $data);
   $this->load->view('news/create');
   $this->load->view('templates/footer');
  }
else
  {
   $this->news_model->set_news();
   $this->load->view('news/success');
  }
}

// funzione per modificare i record
  public function update($id)
{
  $this->load->helper('form');
  $this->load->library('form_validation');

  $data['title'] = 'Update an intem';

  $this->form_validation->set_rules('title', 'Title', 'required');
  $this->form_validation->set_rules('text', 'text', 'required');

  if ($this->form_validation->run() === FALSE)
  {
   $this->load->view('templates/header', $data);
   $this->load->view('news/update');
   $this->load->view('templates/footer');
  }
else
  {
   $this->news_model->update_news($id);
   $this->load->view('news/success');
  }
}
}

and the form view:

Code:

<h2>Update an item</h2>

&lt;?php echo validation_errors(); ?&gt;

&lt;?php echo form_open('news/update') ?&gt;

<label for="title">Title</label>
&lt;input type="input" name="title" /&gt;&lt;br />

<label for="slug">Slug</label>
&lt;input type="input" name="slug" /&gt;&lt;br />

<label for="text">Text</label>
&lt;textarea name="text"&gt;&lt;/textarea><br />

&lt;input type="submit" name="submit" value="Update an item" /&gt;

&lt;/form&gt;

the error is a 404page when i go tonews/update/1 or any other ID...
any one can help me?