Edit Record problem

[eluser]Unknown[/eluser]
Hello , i have page which view all records from database on link :
http://localhost/databox/index.php/adminme/news
and i have made controller,model and view to show a specific record information in a form and if user want to edit any value he can by click submit on that form on the link:
http://localhost/databox/index.php/adminme/news/edit/$id
,but its not working !!

controller/news/
================

Code:

function edit()
{
  $id = $this->uri->segment(4);
  $this->load->model('adminme/news_model');
  $data['results'] = $this->news_model->get_record($id);
//to make the $data variable public to news view
  $this->load->vars($data);
  $content['main_content'] = 'adminme/edit';  
  
  $ndata = array(
  'News_title' => $this->input->post('News_title'),
  'News_abstract' => $this->input->post('News_abstract'),
  'News_discr' => $this->input->post('News_discr'),
  'News_friendly_url' => $this->input->post('News_friendly_url'),
  'News_date' => $this->input->post('News_date'),
  'News_published' => $this->input->post('News_published')
  );
  
     $post=$this->input->post();
      if(isset($post['News_title']))
      {
   $this->load->model('adminme/news_model');
   $this->news_model->update_record($id,$ndata);
   $this->index();
   }
   else {
   echo "BAD NEWS!! ";
          $this->load->view('adminme/includes/template',$content);
  
   }

Model Code/news_model/
======================

Code:

function get_record($id) // RETRIEVE Specific RECORD Date
  {
  $query = $this->db->get_where('news', array('News_id' => $id));
  return $query->result();
  }

function update_record($id,$ndata)
  {
  $this->db->where('News_id', $id);
  $this->db->update('news', $ndata);
  }

so what i want is when clicking on link like:
http://localhost/databox/index.php/adminme/news/edit/85

show a new page contain a form with Record ID 85 values , user can change this values then click submit to change the record on database.

any help is appreciated .
thank you.