@RequestMapping(value = "/sach/edit", method = RequestMethod.GET) public String hienThiSuaSach( @RequestParam(value = "maSach", required = true) String maSach, Model model) { Sach sachExisting = sachService.timSachByMaSach(maSach); if (sachExisting != null) { SachUI sachUI = SachMapper.convertToSachUI(sachExisting); model.addAttribute("sachUI", sachUI); List<TheLoaiSach> tLSs = theLoaiSachService.timDanhMucTheLoaiSach(); List<TheLoaiSachUI> tLSUIs = TheLoaiSachMapper.convertToListTheLoaiSachUI(tLSs); model.addAttribute("theLoaiUIs", tLSUIs); } model.addAttribute("btnName", "Sửa Thông Tin Sách"); return WebConstant.views.THEM_SACH; }