当从jsp组合表单对象时,Spring mvc缺少依赖集合的id

Question

我有以下控制器返回视图:

@RequestMapping(value = "/admin/adminUsers", method = RequestMethod.GET)
    public String adminUsers(ModelMap model, HttpSession session) {
        Set<TerminalAdmin> users = terminalAdminService.getAllAdmins();
        session.setAttribute("users", users);
        model.addAttribute("adminRoles", terminalAdminService.findAllAdminRoles());
        model.addAttribute("terminalAdmin", new TerminalAdmin());
        model.addAttribute("generatedPassword", PasswordUpdateStatus.generatePassword());
        return "admin/adminUsers";
    }

terminalAdminService.findAllAdminRoles()

返回带有id的集合:

在jsp上我渲染它像这样:

<form:form modelAttribute="terminalAdmin" action="/admin/addNewAdmin">
    ...
    <form:checkboxes items="${adminRoles}" path="adminRoles"/>
    ...
</form:form>

我有以下控制器来接受这个对象:

@RequestMapping(value = "/admin/addNewAdmin")
    public String adminUsers(@ModelAttribute @Valid TerminalAdmin terminalAdmin...){
      ....
}

在调试中,我看到terminalAdminadminRoles没有id.

如何解决这个问题？

PS

当我保存实体时,它是Dependent collection重复的继续

Answer 1

我更喜欢使用Converters，因为对我来说它更干净

你应该有类似下面的内容：

public class StringToAdminRoleConverter implements Converter<String, AdminRole> {

    @Autowired
    TerminalAdminService terminalAdminService;

    @Override
    public AdminRole convert(String role) {
        return terminalAdminService.findRoleByName(role);
    }
}