Error update row in codeignaitor - codeigniter

Question

i have error when i update row to database.
my problem is not update the row and call me when i upload pic with update the file upload not define in index.
my controller :
public function addedit(){
$events = new events_model();
$prodID = $this->input->post('hID');
$text = $this->input->post('ev_text');
$pic = $this->do_upload('ev_pic');
$submit = $this->input->post('submit');
if($submit){
if(!empty($prodID)){
$this->data['events'] = $events->UpdatePost($prodID, $text , $pic );
$this->data['pagetitle'] = "Show Info";
$this->data['success']= "Update Done";
}else{
$this->data['success'] = "Add Done";
}
$this->data['status'] = "1";
}else{
$this->data['status'] = "0";
$this->data['errors'] = "Error";
}
$this->template->build('admin/events/add',$this->data);
}
and model :
function UpdatePost($prodID, $text , $pic ) {
if ($pic == ""){
$vales = array('ev_id' => $prodID , 'ev_text' => $text);
}else{
$vales = array('ev_id' => $prodID , 'ev_text' => $text , 'ev_pic' => $pic);
}
$query = $this->db->update($this->table_name, $vales) or die (mysql_error());
$result = array();
$result["process"] = "ok";
echo "1";
}
and view :
<div class="widget-body">
<table class="data-table" action="./administrator/categories/delete/"><!-- Table Conversion: See Section E in custom.js -->
<thead>
<tr>
<th class="sorting no-background" rowspan="1" colspan="1" style="width: 35px;"><input type="checkbox" id="checkall" /></th>
<th class="sorting" rowspan="1" colspan="1" style="width: 343px;">Tittle</th>
<th class="sorting" rowspan="1" colspan="1" style="width: 100px;">Date</th>
<th class="sorting no-background" rowspan="1" colspan="1" style="width: 70px;">#</th>
</tr>
</thead>
<tbody>
<?php $ctr = 0; ?>
<?php foreach ($events as $n): ?>
<tr>
<td><input class="checkrow" type="checkbox" value="<?php echo $n->ev_id; ?>" /></td>
<td class=" sorting_1"><?= $n->ev_text; ?></td>
<td class="center"><?= $n->ev_date; ?></td>
<td>
<span>Edit</span>
<span>Del</span>
</td>
</tr>
<?php endforeach ?>
</tbody>
</table>
<div class="clear"></div>
</div>
<div class="clear"></div>
</div>
<div id="table-extra">
<div id="table-action">
<input action="./administrator/<?php echo $this->uri->segment(2)."/deleteitems" ?>" class="btn-theme table-button btn-hover-black DeleteItems" id="submit" type="button" value="Delete" />
</div>
<div class="paginate">
<ul>
<?= $this->pagination->create_links(); ?>
</ul>
<div class="clear"></div>
</div>
<div class="clear"></div>
</div>
</div>
</div>
where problem in my code , and i wont to update success.

Answer 1

you don't load models like this $events = new events_model(); in CI, you should do it like this :
$this->load->model('Model_name');
$this->Model_name->function();
ref : http://ellislab.com/codeigniter/user-guide/general/models.html#loading