public function postInsertSubJenis(Request $request)
 {
     $validator = \Validator::make($request->all(), ['unit_asal' => 'required', 'actifity_id' => 'required', 'nama_sub' => 'required']);
     if ($validator->fails()) {
         \Session::flash('alert-warning', 'Mohon Lengkapi Kembali Input');
         return redirect()->back();
     }
     $data = $request->all();
     $data['created_by'] = Auth::user()->id;
     $sub_jenis = Sub_jenis_dokumen::create($data);
     return redirect($data['prev_url']);
 }