where clause with order_by in codeigniter giving me issue

Hi All,

I am new in codeigniter framework, I have to add order_by in my query..

PHP Code:

$data['work']=$this->work->where('wuFk', session()->get('uId'))->get()->getResult(); 


I want to add the order_by('uName','DESC'), added like below but giving me issue, bad method execptions.

PHP Code:

$data['work']=$this->work->where('wuFk', session()->get('uId'))->order_by('uName','DESC')->get()->getResult();

Do you have any suggestion for order_by with where clause in query? 


  $data['work']=$this->work->where('wuFk', session()->get('uId'))->get()->getResult();