Question

我遇到了麻烦：/我有一个对象有另一个对象的列表，我想通过选择框和输入更改此列表，但是当我提交此列表时，列表为空

这是我的代码（模型，百里香形式，控制器）：

public class BetConfigVM {

    private long id;
    private String name;
    private List<BetPriorityVM> betPriorities;

    ....getters and setters
}


public class BetPriorityVM {

    private long id;
    private CourseType courseType;
    private BigDecimal minCourse;
    private BigDecimal maxCourse;

    ....getters and setters
}


<form action="#" th:action="@{/betConfigSaveOrUpdate}" th:object="${config}" method="post">            
    <input type="text" th:field="*{name}" />
    <span th:field="*{betPriorities}" th:each="prio : *{betPriorities}">
         <select>
            <option th:each="type : ${T(com.model.database.CourseType).values()}"
                    th:value="${type}" th:text="${type}" th:selected="${prio.courseType == type}">
            </option>
         </select>
         <input type="text" th:field="${prio.minCourse}" />
         <input type="text" th:field="${prio.maxCourse}" />
     </span>
     <input type="submit" th:value="Save" name="action"/>
 </form>


 @RequestMapping(value = "/betConfigSaveOrUpdate", method = RequestMethod.POST)
    public String saveOrUpdateUser(@ModelAttribute("config") BetConfigVM configVM, @RequestParam String action,  Model model) {
        System.out.println(configVM.getName());
        System.out.println("Size " + configVM.getBetPriorities().size());
        model.addAttribute("config", configVM);

        return "user/betConfigEdit";
    }

您是否知道如何在对象中传递更改后的列表？

编辑：添加将显示表单的控制器部分：

 @RequestMapping(value = "/changeBetConfig", method = RequestMethod.GET)
    public String changeBetConfig(Model model, @RequestParam("id") long id) {
        BetConfig betConfig = betConfigRepository.findById(id);
        BetConfigVM configVM = new BetConfigVM(betConfig);
        model.addAttribute("config", configVM);
        return "user/betConfigEdit";
    }

Answer 1

我找到了一个解决方案......表单必须如下所示：

<form action="#" th:action="@{/betConfigSaveOrUpdate}" th:object="${config}" method="post">            
<input type="text" th:field="*{name}" />
<span th:each="prio, rowStat  : *{betPriorities}">
     <select th:field="*{betPriorities[__${rowStat.index}__].courseType>
        <option th:each="type : ${T(com.model.database.CourseType).values()}"
                th:value="${type}" th:text="${type}" th:selected="${prio.courseType == type}">
        </option>
     </select>
     <input type="text" th:field="*{betPriorities[__${rowStat.index}__].minCourse}" />
     <input type="text" th:field="*{betPriorities[__${rowStat.index}__].maxCourse}" />
 </span>
 <input type="submit" th:value="Save" name="action"/>

如何通过百日咳形式更新与对象列表相关的对象

1 个答案: