private ModelAndView createTMAFormView(Long wsId, Long dasId) {
    ModelAndView mav = new ModelAndView("admin/sda/hidrologi/tinggi_muka_air/form_tma");

    mav.addObject("ws", wilayahSungaiService.findById(wsId));
    mav.addObject("das", dasService.findById(dasId));

    mav.addObject("yearLookup", getYearLookup());
    return mav;
  }
  @RequestMapping(value = "list/{wsId}.html")
  public ModelAndView list(@PathVariable("wsId") Long wsId) {
    ModelAndView mav = new ModelAndView("admin/sda/hidrologi/tinggi_muka_air/list_das");

    WilayahSungai ws = wilayahSungaiService.findById(wsId);
    mav.addObject("ws", ws);

    mav.addObject("listDas", dasService.findByWilayahSungai(ws));
    return mav;
  }
  private void saveTMAForm(Long id, TinggiMukaAirForm form, Long dasId) throws IOException {
    TinggiMukaAir tma = (id == null ? new TinggiMukaAir() : tinggiMukaAirService.findById(id));

    tma.setDescription(form.getDescription());

    Year year = yearService.findById(form.getYear());
    tma.setYear(year);

    Das das = dasService.findById(dasId);
    tma.setDas(das);

    if (form.getFile() == null || form.getFile().isEmpty()) {
      tinggiMukaAirService.save(tma);
    } else {
      tma.setFilename(form.getFile().getOriginalFilename());
      tinggiMukaAirService.save(tma, form.getFile().getInputStream());
    }
  }