codeigniter unable to insert multiple row data to database

Hello everyone,

First I'm new here so nice to meet you all,

I had try to insert data using codeigniter like this :

my views :

Code:

 <?php echo form_open('index.php/testadddiscount');?>  
    $n = 1;
    foreach($disc as $exist) {
         echo "
           <input name=\"iddisc".$n."\" type=\"text\" value=\"".$iddisc."\" class=\"textbox\" />
           <input name=\"dname".$n."\" value=\"".$discount_name."\" type=\"text\"  />
               ";
      $n++
           } // end foreach

 <input type="submit" value="send" />
<?php echo form_close();?>

my models :

Code:

function discount() {
$query = $this->db->get('discount');
$query = $query->result();

$n =1;

foreach($query as $rows) {
  $data[$n] = array(
  'iddiscount'=> $_POST['iddisc'.$n],
  'discountname' => $_POST['dname'.$n],
  'status' => 1
  );

$this->db->insert('test',$data[$n]);
$n++;
 }
return $this->db->insert_id();
}

my controller :

Code:

function testadddiscount() {

  $this->test_model->discount();

}

I had try code on above this will show value but unable to insert them into database.

please help me

Thanks