我想发送带有model.addattribute的对象，并在保存后获取所有对象的变量。
控制器

@GetMapping(value = "/passport/details/{id}")
    @PreAuthorize("isAuthenticated()")
    public String passportDetails(Model model, @PathVariable(name = "id") Long id) {
        PassportRequest passportRequest = businessService.getPassportRequestById(id);
        model.addAttribute("passport", passportRequest);
        return "/user/passport/create";
    }
    @PostMapping(value = "/passport/save")
    @PreAuthorize("isAuthenticated()")
    public String savePassport(PassportRequest passport) {
        businessService.savePassportRequest(passport);
        return "redirect:/passport/details/" + passport.getId();
    }

html代码：

<form enctype="multipart/form-data" method="post" th:action="@{/passport/save}"
                  data-parsley-validate="" role="form"
                  novalidate="" th:object="${passport}" id="sign-form">
    <input type="hidden" th:field="*{id}">
    <input type="hidden" th:field="*{stage}"> 
    <div class="col-6 m-input-group">
         <label>Кем командирован</label>
         <input type="text" name="postedBy" placeholder="Введите" th:field="*{postedBy}" required>
    </div> 
</form

问题是我需要做些什么 <input type="hidden" th:field="*{objectVariable}"></input> 发送到每个变量。有更简单的方法吗？