php - Codeigniter - Checking if value already exists in database with $result->num_rows == 0 not working -

a user sees coupon page, enters coupon code , if coupon valid, see page pick gift (known exploits). (part 1) can choose exploit. , after choose it, saves in database after clicking submit. but saves in database if value not exist in database. (part 2)

so, have finished part 1, part 2 me not working. saves value in database every single time, though value exists in database.

here's code controller:

$result = $this->model_users->insert_used_coupon($exploit, $coupon); switch ($result) {             case 'used_coupons':               //do stuff                 break;              case 'failed':               //do stuff                 break;              case 'success':               //do stuff                 break;         } 

my model file:

$time = date("y-m-d h:i:s");     $uid = $this->session->userdata('uid');      $this->db->select('uid');     $this->db->where('uid', $uid);     $result = $this->db->get('used_coupons');      if($result->num_rows == 0) {         $data = array(             'coupon' => $exploit,             'exploit' => $coupon,             'time' => $time,             'uid' => $uid);          $this->db->insert('used_coupons', $data);          if ($this->db->affected_rows() === 1) {             return 'success';         } else {             return 'failed';         }      } else {         return 'already_exists';     } 

i have no idea why issue happening. hlep highly appreciated. thanks.

you try replacing

if($result->num_rows == 0) {

with

if($result->num_rows() > 0) {

or

if($result->num_rows() == 0) {