Grails Controller Actions可能不会超载

Question

我正在尝试使用重载方法在Grails 2.3.4中的控制器中附加XML.

我在ReportController中有以下重载方法.

String makePhotoXml(StringBuilder sb, Report r, String url, String desc) {

    sb.append("<photo>")
    sb.append(Utilities.makeElementCdata("url", url))
    sb.append(Utilities.makeElementCdata("caseId", r.caseId))
    sb.append(Utilities.makeElementCdata("type", r.type))
    sb.append(Utilities.makeElementCdata("date", r.dateCreated.format('MM/dd/yy')))
    sb.append(Utilities.makeElementCdata("address", r.address))
    sb.append("<extra>extra</extra>")
    sb.append(Utilities.makeElementCdata("description", desc))
    sb.append("</photo>")
}

String makePhotoXml(List<Report> reports) {
    StringBuilder sb = new StringBuilder()
    sb.append("<photos>")
    sb.append("<title>Photos</title>")
    for (Report r : reports) {
        for (Photo photo : r.photos) {
            makePhotoXml(sb, r, photo.url(), photo.description)
        }
        for (Document doc : r.photoDocuments) {
            makePhotoXml(sb, r, doc.url(-1), doc.getDescription())
        }
    }
    sb.append("</photos>")
}

运行应用程序时,我收到此编译器错误:

| Error Compilation error: startup failed:
/Users/Anthony/GrailsApps/AppOrderWeb/grails-app/controllers/com/apporder/ReportController.groovy: 1360: Controller actions may not be overloaded.  The [makePhotoXml] action has been overloaded in [com.apporder.ReportController]. @ line 1360, column 5.
       String makePhotoXml(StringBuilder sb, Report r, String url, String desc) {

我认为Groovy和Grails支持方法重载.有关如何解决此问题并使此重载方法有效的任何想法？

Answer 1

Groovy通常允许方法重载,但Grails禁止它用于控制器操作的特定情况.如果您想在控制器中使用实用程序方法,则需要制作它们private,protected因此Grails不会尝试将它们视为Web可见操作.

或者,将辅助方法移动到服务中而不是将它们放在控制器中会更加Grails-y.