list - 在gsps上显示列表(grails)

Question

我是grails 1.3.7的新手，我尝试访问数据库并在gsp上显示数据。现在，我遇到了以下问题:我有一个问题列表(listofQuestions)和一个答案列表(listofAnswers)。每个问题都属于一个Lpicanswer对象，其中包含各种答案(answera，answerb)

因此，当我创建这些列表时，最后我得到了一个包含问题的列表和一个包含lpicanswer-objects的列表。每个lpicanswer对象都有一个lpicid(这是问题的ID)，因此它们彼此相关。

这是创建这些列表的代码:

    List listofQuestions = []
    List listofAnswers = []

    def ques
    def question
    def ans
    // we create a questions list containing questions
    // we create a answers list containing answers-objects for a question
    for (int i = 0; i <= cacheService.questionList.size()-1; i++) {
        ques = Lpicquestions.get(cacheService.questionList[i]);
        question = ques.question;
        listofQuestions.add(question);
    }

    for (int i = 0; i <= cacheService.questionList.size(); i++) {
        ans = Lpicanswers.get(cacheService.questionList[i]);
        listofAnswers.add(ans);
    }

     return new ModelAndView("/result/resultdetail", [ qlist : listofQuestions, alist : listofAnswers ]);}

现在我想在我的gsp上显示它们。这是我的工作:

<g:each in="${qlist}">

<b>${it}</b><br/>

${alist.answera}<br/>
${alist.answerb}<br/>
${alist.answerc}<br/>
${alist.answerd}<br/>
${alist.answere}<br/>
${alist.answerf}<br/>
${alist.answerg}<br/>
${alist.answerh}<br/>

</g:each>

发生的情况是，给出的问题是正确的，但答案当然不是。对于每个问题，将显示所有答案a，所有答案b等(例如:[answera-from-question1，answera-from-question2]等)，我该如何解决呢？

任何帮助将不胜感激! :-)

[编辑]这是lpicquestions和lpicanswers的结构，感谢您的帮助! :-)

package com.lpic

class Lpicquestions {

    int lpicchapter 
    String question

    static constraints = {
        question(nullable:false, blank:false, maxSize:1000)
        lpicchapter(nullable:false, blank:false)
    }

}


package com.lpic

class Lpicanswers {

    Lpicquestions lpicid
    String answera
    String answerb
    String answerc
    String answerd
    String answere
    String answerf
    String answerg
    String answerh

    static constraints = {
    }
}

Answer 1

aList不是对象或 map 。因此，您不能输入以下内容:
$ {alist.answera}

将 View 更改为。

<g:each var="question" in="${qlist}">
    <b>${question}</b><br/>
    <g:each var="answer" in="${aList}">
        <g:if test="${answer.lpicid?.question == question}">
            <b>${answer.answera}</b><br/>
            <b>${answer.answerb}</b><br/>
            <b>${answer.answerc}</b><br/>
            <b>${answer.answerd}</b><br/>
            <b>${answer.answere}</b><br/>
            <b>${answer.answerf}</b><br/>
            <b>${answer.answerg}</b><br/>
            <b>${answer.answerh}</b><br/>
        </g:if>
    </g:each>
</g:each>

如果假设cacheService.questionList包含Lpicquestions的ID列表
更改

for (int i = 0; i <= cacheService.questionList.size(); i++) {
    //ans = Lpicanswers.get(cacheService.questionList[i]);
    ans = Lpicanswers.findWhere(['lpicid' : Lpicquestions.get(cacheService.questionList[i])]);
    listofAnswers.add(ans);
}