将列表项显示为复选框--既不是BindingResult，也不是普通可用的

Question

我有以下目标。

public class Anonymization {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;
    @OneToMany(mappedBy = "anonymization")
    private List<Host> hosts;
    @OneToMany(mappedBy = "anonymization")
    private List<Item> items;

对象Host和Item有几个布尔字段。我想要显示一个表单，其中所有的主机和项目对象都显示为复选框，以便可以编辑布尔字段。我写了一个控制器来显示表单

@RequestMapping("monitoringsystem/{mId}/anonymization")
    public String editAnonymisatzion(Model model, @PathVariable Long mId){
        model.addAttribute("mId", mId);
        model.addAttribute("anonymization", monitoringSystemRepository.findOne(mId).getAnonymization());
        return "monitoringsystem/anonymizationForm";
    }

anonymizationForm应该在for-each循环中显示复选框。

<!-- more code --->
<form class="form-horizontal" th:modelAttribute="anonymization" th:object="${anonymization}" th:action="@{'monitoringsystem/' + ${mId} + '/anonymisatzion/save'}" method="post">
            <input type="hidden" th:field="*{id}"/>
            <fieldset>
                <legend>Set Anonymization</legend>
                <div class="panel panel-default">
                    <div class="panel-heading">Anonymizie Hostnames</div>
                    <div class="panel-body">
                        <div class="form-group" th:each="host : ${anonymization.hosts}">
                            <label class="col-md-4 control-label" for="checkboxes" th:text="${host.name}"></label>
                            <div class="col-md-4">
                                <div class="checkbox">
                                    <label for="checkboxes-0">
                                        <input th:field="${host.anonymizeName}" type="checkbox" /> 
                                        anonymizie
                                    </label>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="panel panel-default">
                    <div class="panel-heading">Anonymizie Items</div>
                    <div class="panel-body">
                        <div class="form-group" th:each="item : ${anonymization.items}">
                            <label class="col-md-4 control-label" for="checkboxes" th:text="${item.name}"></label>
                            <div class="col-md-4">
                                <div class="checkbox">
                                    <label for="checkboxes-0">
                                        <input th:field="${item.anonymizeName}" type="checkbox" /> 
                                        anonymizie name
                                    </label>
                                </div>
                                <div class="checkbox">
                                    <label for="checkboxes-0">
                                        <input th:field="${item.anonymizeData}" type="checkbox" /> 
                                        anonymizie data
                                    </label>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
<!-- more code --->

不幸的是，当我调用视图时，我得到了以下错误

Caused by: java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'host' available as request attribute 

我检查我的数据库所有的关系是正确的设置。List<Host>应该包含1和List<Item> 2条目。

我找不到我的错误。

更新1:

我调试了传递给窗体的匿名对象。已经完成了。这意味着所有的列表条目都存在。因此，我想这个错误与我的观点有关--我如何调用对象。

Answer 1

我通过我自己找到了解决方案。首先，我改变了在表单中调用列表对象的方式。

<form class="form-horizontal" th:modelAttribute="anonymization" th:object="${anonymization}" th:action="@{'monitoringsystem/' + ${mId} + '/anonymisatzion/save'}" method="post">
        <input type="hidden" th:field="*{id}"/>
        <fieldset>
            <legend>Set Anonymization</legend>
            <div class="panel panel-default">
                <div class="panel-heading">Anonymizie Hostnames</div>
                <div class="panel-body">
                    <div class="form-group" th:each="host, statHost : *{hosts}">
                        <label class="col-md-4 control-label" for="checkboxes" th:text="*{hosts[__${statHost.index}__].name}"></label>
                        <div class="col-md-4">
                            <div class="checkbox">
                                <label for="checkboxes-0">
                                    <input th:field="*{hosts[__${statHost.index}__].anonymizeName}" type="checkbox" /> 
                                    anonymizie
                                </label>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
            <div class="panel panel-default">
                <div class="panel-heading">Anonymizie Items</div>
                <div class="panel-body">
                    <div class="form-group" th:each="item, statItem : *{items}">
                        <label class="col-md-4 control-label" for="checkboxes" th:text="*{items[__${statItem.index}__].name}"></label>
                        <div class="col-md-4">
                            <div class="checkbox">
                                <label for="checkboxes-0">
                                    <input th:field="*{items[__${statItem.index}__].anonymizeName}" type="checkbox" /> 
                                    anonymizie name
                                </label>
                            </div>
                            <div class="checkbox">
                                <label for="checkboxes-0">
                                    <input th:field="*{items[__${statItem.index}__].anonymizeData}" type="checkbox" /> 
                                    anonymizie data
                                </label>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
            <div class="panel panel-default">
                <div class="panel-body">
                    <div class="form-group">
                        <label class="col-md-4 control-label" for="singlebutton"></label>
                        <div class="col-md-4">
                            <a th:href="@{/monitoringsystem}" class="btn btn-default btn-small">Cancel</a> <button id="singlebutton" name="singlebutton" class="btn btn-primary btn-small">Submit</button>
                        </div>
                    </div>
                </div>
            </div>
        </fieldset>
    </form>

此外，似乎有一个问题，命名的getter和策划者。我的就像：

setBoolean(boolean b){
    this.b = b;
}

isBoolean(){
    return b;
}

Spring或thymeleaf (我不知道哪个组件负责)似乎需要getter从get开始。在改变了这个之后，它现在开始工作了。

setBoolean(boolean b){
    this.b = b;
}

getBoolean(){
    return b;
}