public function doDelete($id)
 {
     $input = Request::all();
     $rules = array('lokasi' => 'required|exists:lokasi,id');
     $validator = Validator::make($input, $rules);
     if ($validator->fails()) {
         return view('error');
     } else {
         $penyimpanan = Penyimpanan::where('id_lokasi', $id)->update(["id_lokasi" => $input['lokasi']]);
         $lokasi = Lokasi::find($id);
         $lokasi->delete();
         return redirect('/lokasi');
     }
 }
 public function add()
 {
     $input = Request::all();
     $rules = array('lokasi' => 'required|exists:lokasi,id', 'nama' => 'required', 'kode' => 'required');
     $validator = Validator::make($input, $rules);
     if ($validator->fails()) {
         return view('error');
     } else {
         $alat = new Alat();
         $alat->fill($input);
         $alat->save();
         $penyimpanan = new Penyimpanan();
         $penyimpanan->id_alat = $alat->id;
         $penyimpanan->id_lokasi = $input['lokasi'];
         $penyimpanan->save();
         return redirect('/');
     }
 }