$result->fetch_assoc() is failing

I am trying to modify my password code with some code I got from from Codex. The Codex code has this:

PHP Code:

       if(array_key_exists("returnType",$conditions) && $conditions['returnType'] != 'all'){
            switch($conditions['returnType']){
                case 'count':
                    $data = $result->num_rows;
                    break;
                case 'single':
                    $data = $result->fetch_assoc();   <<<<this line
                    break;
                default:
                    $data = '';
            }
        }else{
            if($result->num_rows > 0){
                while($row = $result->fetch_assoc()){
                    $data[] = $row;
                }
            }
        }

But the fetch_assoc line is failing with this error: Call to undefined method CI_DB_mysqli_result::fetch_assoc()

Anyone know why? 


Read the doc. https://www.codeigniter.com/user_guide/d...ult-arrays