public function yajra(Request $request)
    {
        DB::statement(DB::raw('set @rownum=0'));
        $users = M_keluhan::select([
            DB::raw('@rownum  := @rownum  + 1 AS rownum'),
            'id',
            'nama',
            'created_at',
            'updated_at']);
        $datatables = Datatables::of($users)->addColumn('details_url', function($e) {
            return url('master/keluhan-tarif/yajra/' . $e->id);
            // return $e->pendaftarans->users->name;
        })->addColumn('action',function($e){
            $url = url('master/keluhan-tarif/add/'.$e->id);

            $dt = '<div style="width:60px"><a href="'.$url.'" class="btn btn-primary btn-xs btn-edit" id="edit"><i class="fa fa-plus"></i> Tambah Tarif</a></div>';

            return $dt;
        });

        if ($keyword = $request->get('search')['value']) {
            $datatables->filterColumn('rownum', 'whereRaw', '@rownum  + 1 like ?', ["%{$keyword}%"]);
        }

        return $datatables->make(true);
    }