Java Thymeleaf：如何从列表或数据库中检索元素而不进行迭代？

我试图使用SpEl th:if=${certs.flag=='true'}检查数据库中的字段是否为true或false。如果设置为true，则不应显示表单。我已经搜索了所有地方，但似乎找不到任何一篇文章有一个我所需要的确切例子。每个人似乎都在使用迭代。但迭代不适用于我正在做的事情

  @RequestMapping(value = "/cert_prog", method = RequestMethod.GET)
    public String examsList(Model model, CertificateProgramme certificateProgramme){
        Iterable<Exams> exams = examService.findAll();
        Iterable<School> schools = schoolService.findAll();
        Iterable<CertificateProgramme> certificateProgrammes = certificateService.findAll();
        Iterable<Picture> pictures = pictureService.findAll();
        CertificateProgramme mycert = certificateService.flagger(certificateProgramme);
        model.addAttribute("mycert", mycert);
        model.addAttribute("exams", exams);
    if(!model.containsAttribute("newExam")){
        model.addAttribute("newExam", new Exams());
    }

    model.addAttribute("certificateProgrammes", certificateProgrammes);
    if(!model.containsAttribute("certificate")){
        model.addAttribute("certificate",new CertificateProgramme());
    }
    model.addAttribute("grades", Grade.values());
    model.addAttribute("regions", Region.values());
    model.addAttribute("schools",schools);
    if(!model.containsAttribute("newSchool")){
        model.addAttribute("newSchool",new School());
    }

    model.addAttribute("picture", new Picture());
    return "cert_prog";
}

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你的问题对我来说毫无意义。如果要检查数据库中的单个字段，则无法传递项目列表。例如，在html中：

<div th:each="certs : ${certificateProgrammes}">
  <form th:if="${certs.flag == 'TRUE'}">
    .
    .
    .
  </form>
</div>

在html中

<!-- no iterating required, because you know which object you're talking about -->
<form th:if="${certs.flag == 'TRUE'}">

model.addAttribute("certs", /* however you get the specific one you want to check */);

<!-- no iterating required, because you know which object you're talking about -->
<form th:if="${certs.flag == 'TRUE'}">