Question

我有两个使用ManyToMany注释映射的实体，并且数据保存按预期工作，问题是我无法使多重选择显示正确的选定选项。

在我的模板中，我有：

<div class="form-select col-sm-10">
    <select th:field="*{addresses}" class="form-control" multiple="multiple">
        <option th:each="a : ${addresses}"
        th:value="${a.addressId}" th:text="${a.addressName}">Opzione</option>

    </select>
</div>

这与我用于单个选择的相同片段正确显示所选元素，但它不适用于多个。

ManyToMany注释以这种方式制作

@Entity
public class User {

@ManyToMany
    private List<Address> addresses = new ArrayList<>();

//getters and setters

}

@Entity
public class Address {

@ManyToMany(fetch = FetchType.LAZY, cascade = {CascadeType.PERSIST, CascadeType.REMOVE, CascadeType.DETACH, CascadeType.REFRESH}, mappedBy = "addresses")
    private List<User> users = new ArrayList<>();

//getters and setters

}

在控制器中，我只需获取地址列表并将其添加到模型中。我看到select中的值，唯一不起作用的是选择正确的选项。更多的是，如果我在编辑页面上选择一些新选项，它们会被正确保存

    @RequestMapping("/{userId}")
        public String getUser(@PathVariable long userId, ModelMap model) {
            User logged = authenticationFacade.getAuthenticatedUser();

            User user = service.findById(userId);
            UserDTO dto = new UserDTO();
            List<Location> locations = locationService.findAllLocations();
        Iterable<Address> addresses = addressService.findByLocationInAndActiveIsTrue(locations);
        List<Address> addressList = new ArrayList<>();
        addresses.forEach(addressList::add);
        logger.debug("Gli address dell'utente sono: " + user.getAddresses());
        model.addAttribute("addresses", addressList);
        model.addAttribute("user", dto);
        model.addAttribute("edit", true);
        model.addAttribute("pageTitle", user.getFirstName() + " " + user.getLastName());
        model.addAttribute("userProfiles", userProfiles);
        model.addAttribute("realUser", user);

        return "admin/backuser";
    }

Spring + Thymeleaf - 如何选择e多选

0 个答案: