Can't access image from file field in codeigniter - codeigniter-3

Question

I can't access image from file field in codeigniter view.In my project form helper is auto-loaded.When i check by form_validation it is found that image from file field is not reached at controller.
I got the message image not selected when i checked with form_validation and die function.
This is my view
<div id="content" class="clearfix">
<div class="contentwrapper"><!--Content wrapper-->
<div class="heading">
<h3>Manage images</h3>
</div><!-- End .heading-->
<!-- Build page from here: Usual with <div class="row-fluid"></div> -->
<div class="row-fluid">
<div class="span6" style="width:70%; margin-left:15%;">
<div class="box">
<div class="title">
<h4>
<span>Update Image</span>
</h4>
</div>
<?php echo form_open_multipart('productadmin/update_image');?>
<div class="form-row row-fluid">
<div class="span12">
<div class="row-fluid">
<label class="form-label span4" for="textarea">image<b style="color:#F00; font-size:11px;">*</b></label>
<input type="file" name="image">
<span class="error">
</span>
</div>
</div>
</div>
<div class="form-row row-fluid">
<div class="span12">
<div class="row-fluid">
<img src="<?php echo base_url();?>uploads/products/<?php echo $name;?>" width="50%" height="%">
</div>
</div>
</div>
<div class="form-actions">
<button type="submit" class="btn btn-info" style="float:right;">Submit</button>
</div>
<?php echo form_close();?>
</div>
</div><!-- End .box -->
</div><!-- End .span6 --><!-- End .span6 --><!-- End .span6 -->
</div><!-- End .row-fluid --><!-- End .row-fluid --><!-- End .row-fluid --><!-- End .row-fluid -->
</div><!-- End contentwrapper -->
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.1/jquery-ui.min.js" type="text/javascript"></script>
<!-- End #content -->
<!-- End #wrapper -->
It is my controller
class Productadmin extends CI_Controller
{
public function __construct()
{
parent::__construct();
$this->load->model('products_model');
$this->load->helper('security');
$this->load->helper('url');
if($this->session->userdata('activedata')!=true)
{
$this->session->set_flashdata('message','Please do login');
redirect('admin');
}
error_reporting(0);
}
public function update_image()
{
$id=$this->input->post('ids');
$newname=$this->input->post('image');
$this->form_validation->set_rules('image','Image','required');
$this->form_validation->set_error_delimiters('','');
if($this->form_validation->run()==false)
{
echo "image not selected";
die();
$this->template->load('adminhome','edit_image','');
}
else
{
echo "image selected";
die();
$config=array(
'upload_path'=>'./uploads/products/',
'allowed_types'=>'jpg|png',
);
$this->load->library('upload',$config);
$this->upload->do_upload('images');
$data=$this->upload->data();
$newimage=$data['file_name'];
echo $newimage;
die();
$this->products_model->update_single_image($id,$newimage);
redirect('productadmin/viewimages/'.$id);
}
}
}
pls help me

Answer 1

Change this rule :
$this->form_validation->set_rules('image','Image','required');
to this :
if (empty($_FILES['image']['name']))
{
$this->form_validation->set_rules('image', 'Image', 'required');
}
so when the image is not empty, the validation rule for that image will be skipped.