无法使用 Thymeleaf 呈现对象：属性 或在类型 'org.parse4j.ParseObject' 的对象上找不到字段 - 也许不是 public？

Question

我一直在按照本指南 http://www.thymeleaf.org/doc/articles/springmvcaccessdata.html 学习如何使用 Thymeleaf 将数据模型呈现到 Springboot 应用程序中。我有一个函数可以从我的 Parse-Server 中检索对象列表并将它们呈现为模型属性：

@RequestMapping(value = "/requests", method = RequestMethod.GET)
public String findRequestsByCurrentUser(Model model) {

    ParseUser currentUser = ParseUser.getCurrentUser();
    log.info(String.valueOf(currentUser.getObjectId()));

    findRequestsByCurrentUser(model, currentUser);

    return "requests";
}


private void findRequestsByCurrentUser(Model model, TmtUser currentUser) {
    ParseQuery<ParseObject> requestsQuery = ParseQuery.getQuery(ParseConstantsUtil.CLASS_REQUEST);
    requestsQuery.whereContains(ParseConstantsUtil.REQUEST_AUTHOR, currentUser.getObjectId());
    try {
        List<ParseObject> requestsArrayList = requestsQuery.find();
        model.addAttribute("requests", requestsArrayList);
        log.info(String.valueOf(requestsArrayList));
        log.info(String.valueOf(requestsArrayList.size()));
    } catch (ParseException e) {
        e.printStackTrace();
    }
}

这是我发送到视图的模型调试：

我能够呈现对象，因为我可以包含静态文本而不是其属性，并且它将循环 15 次（在查询中检索到的对象数）。但是每当我键入 request.requestText 或 request.requestStatus 时，我都会收到错误消息：

<center>
    <table class="table table-striped">
        <tr>
            <td><b>Requested By</b>
            </td>
            <td><b>Reason</b>
            </td>
            <td><b>Requested Date</b>
            </td>
            <td><b>Status</b>
            </td>
        </tr>
        <tr th:each="request : ${requests}">
            <div th:switch="${request.requestStatus}">
                <div th:case="Approved">
                    <td th:text="${request.author.objectId" class="initial-name">Employee Initials
                    </td>
                    <td th:text="${request.requestText}">Request Description</td>
                    <td th:text="${request.dateRequested}">Request Date</td>
                    <td th:switch="${request.requestStatus}">
                        <span class="red" th:case="Pending" th:text="Pending">Status</span>
                        <span class="green" th:case="Approved" th:text="Approved">Status</span>
                        <span class="red" th:case="Rejected" th:text="Rejected">Status</span>
                    </td>
                </div>
            </div>
        </tr>
    </table>
</center>

异常：

Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'requestText' cannot be found on object of type 'org.parse4j.ParseObject' - maybe not public?
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:207) ~[spring-expression-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT]
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:96) ~[spring-expression-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT]
    at org.springframework.expression.spel.ast.PropertyOrFieldReference.access[=15=]0(PropertyOrFieldReference.java:48) ~[spring-expression-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT]
    at org.springframework.expression.spel.ast.PropertyOrFieldReference$AccessorLValue.getValue(PropertyOrFieldReference.java:358) ~[spring-expression-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT]
    at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:88) ~[spring-expression-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT]
    at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:120) ~[spring-expression-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT]
    at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:267) ~[spring-expression-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT]
    at org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:263) ~[thymeleaf-spring5-3.0.3.M1.jar:3.0.3.M1]
    ... 116 common frames omitted

为什么 Thymeleaf 无法访问 ParseObject 属性？

当我自己打印 ${request} 时，我得到：例如 org.parse4j.ParseObject@5975192b。我还可以检索 ${request.objectId}。检索属性的语法是什么？ ${request.data.requestText} 好像也不行...

Answer 1

它在使用 Hashmap 访问模型属性时有效，无需创建自定义 ParseObject：

<td th:text="${request.get('requestText')}">Request Description</td>