update record with the form - Codeigniter 2.1 - codeigniter

Question

i have some problem with update in CI 2.1
I followed the user guide "mini-tut" for create e news, but i cant understand how to update a record with a form.
my update models is:
// update dei record
public function update_news($id)
{
$data = array(
'title' => $this->input->post('title'),
'slug' => $this->input->post('slug'),
'text' => $this->input->post('text')
);
$this->db->where('id', $id);
$this->db->update('news', $data);
}
how can i make the controller for update?? i try:
public function update($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');
}
}
but i display a 404() page...
the views for update is:
<h2>Update an item</h2>
<?php echo validation_errors(); ?>
<?php echo form_open('news/update') ?>
<label for="title">Title</label>
<input type="input" name="title" /><br />
<label for="slug">Slug</label>
<input type="input" name="slug" /><br />
<label for="text">Text</label>
<textarea name="text"></textarea><br />
<input type="submit" name="submit" value="Update an item" />
</form>
any one can help me how do a "simnple" update for understand a CI logic?

Answer 1

If I understand what you want, then you should just pass the $this->input->post(x) to the model from your controller.
I personally have been using it like this:
Controller:
$data = array(
'title' => $this->input->post('title'),
'text' => $this->input->post('text'),
'slug' => $this->input->post('slug'),
);
if($this->my_model->exists($id)) {
$this->my_model->update($id, $data);
} else {
$this->my_model->insert($data);
}
And your Model should look like:
// update dei record
public function update($id, $data)
{
$this->db->where('id', $id);
$this->db->update('news', $data);
}
Your controller uses the first segment as an argument of the controller method:
public function update($id)
You can also try using
$id = $this->uri->segment(3);

Answer 2

//Controller
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');
$data['news'] = $this->news_model->get_news_by_id($id);
if ($this->form_validation->run() === FALSE)
{
$this->load->view('templates/header', $data);
$this->load->view('news/update', $data);
$this->load->view('templates/footer');
}
else
{
$this->load->helper('url');
$this->news_model->update_news($id);
redirect('/news', 'refresh');
}
}
//Model
public function update_news($id)
{
$data = array(
'title' => $this->input->post('title'),
'slug' => $this->input->post('title'),
'text' => $this->input->post('text')
);
$this->db->where('id', $id);
$this->db->update('news', $data);
}
View
<label for="title">Title</label>
<input type="input" name="title" value="<?php echo $news[0]['title'];?>" /><br />
<input type = "hidden" name="id" value="<?php echo $news[0]['id'];?>" />
<label for="text">Text</label>
<textarea name="text"><?php echo $news[0]['text'];?></textarea><br />
<input type="submit" name="submit" value="Create news item" />

Answer 3

To add a page in code igniter
I will give you the example which i have done
Model:
function add()
{
$name=$_POST['name'];
$department=$_POST['dept'];
$degree=$_POST['degree'];
$mark=$_POST['mark'];
$this->db->query("INSERT INTO `simple`(name,department,degree,mark) VALUES('$name','$department','$degree','$mark')");
}
Controller:
public function add()
{
$this->load->model('modd');
$this->modd->add();
$this->load->view('add');
}
Views :
add.php
<form method="post" action="<?php base_url();?>index.php/contr/add">
<table>
<?php echo form_open('contr/add');?>
<tr>
<th>Name</th>
<td><input type="text" name="name" /></td>
</tr>
<tr>
<th>Department</th>
<td><input type="text" name="dept" /></td>
</tr>
<tr>
<th>Degree</th>
<td><input type="text" name="degree" /></td>
</tr>
<tr>
<th>Marks</th>
<td><input type="text" name="mark" /></td>
</tr>
<tr>
<td><input type="submit" name="add" value="Add" /></td>
<?php echo form_close(); ?>
<td>
<input type="button" value="view" />
</td>
</tr>
</table>