GRAILS:groovy.lang.MissingPropertyException:没有这样的属性。

我正在尝试调试Grails应用程序。不幸的是，我以前没有使用这种语言的经验

当我执行grails生成所有org.example.Book时，我得到一个模糊的错误：

Generating controller for domain class org.example.Book ...
groovy.lang.MissingPropertyException: No such property: Event for class: SimpleTemplateScript6
    at SimpleTemplateScript6.run(SimpleTemplateScript6.groovy:22)
    at _GrailsGenerate_groovy.generateForDomainClass(_GrailsGenerate_groovy:88)
    at _GrailsGenerate_groovy$_run_closure1.doCall(_GrailsGenerate_groovy:48)
    at GenerateAll$_run_closure1.doCall(GenerateAll.groovy:42)
    at gant.Gant$_dispatch_closure5.doCall(Gant.groovy:381)
    at gant.Gant$_dispatch_closure7.doCall(Gant.groovy:415)
    at gant.Gant$_dispatch_closure7.doCall(Gant.groovy)
    at gant.Gant.withBuildListeners(Gant.groovy:427)
    at gant.Gant.this$2$withBuildListeners(Gant.groovy)
    at gant.Gant$this$2$withBuildListeners.callCurrent(Unknown Source)
    at gant.Gant.dispatch(Gant.groovy:415)
    at gant.Gant.this$2$dispatch(Gant.groovy)
    at gant.Gant.invokeMethod(Gant.groovy)
    at gant.Gant.executeTargets(Gant.groovy:590)
    at gant.Gant.executeTargets(Gant.groovy:589)
Error running generate-all: No such property: Event for class: SimpleTemplateScript6

查看生成的org.example.BookController.groovy源代码后，我注意到它没有完全生成（在列表字段=[]处停止）：

此错误似乎是由templates/scaffolding/Controller.groovy中的以下代码引起的：

<%=packageName ? "package ${packageName}\n\n" : ''%>

// import needed for export plugin
import org.codehaus.groovy.grails.commons.ConfigurationHolder

class ${className}Controller {

    static allowedMethods = [save: "POST", update: "POST", delete: "POST"]^M

    def exportService

    ...

    def export = {attrs ->
    def response = attrs.response
    List fields = []
    <% excludedProps = Event.allEvents.toList() << 'version'
       allowedNames = domainClass.persistentProperties*.name << 'id' << 'dateCreated' << 'lastUpdated'
       props = domainClass.properties.findAll { allowedNames.contains(it.name) && !excludedProps.contains(it.name) && !Collection.isAssignableFrom(it.type) }
       Collections.sort(props, comparator.constructors[0].newInstance([domainClass] as Object[]))
       props.eachWithIndex {p, i -> %>fields.push("${p.name}"<%="\n"%><% } %>
       Map labels = [:]
       <% props.eachWithIndex { p, i -> %>labels.putAt("\${p.name}", "\${p.naturalName}")<%="\n "%><% } %>

       Map formatters = [:]
       Map parameters = [:]
       response.setHeader("Content-disposition", "attachment; filename=${domainClass.propertyName}s.\${attrs.extension}")
       if("\${attrs.extension}" == "xml") {
            exportService.export(attrs.format, response.outputStream, attrs.exportList, fields, [:], formatters, parameters)
       } else {
            exportService.export(attrs.format, response.outputStream, attrs.exportList, fields, labels, formatters, parameters)
       }
    }
...
}

//导出插件需要导入
导入org.codehaus.groovy.grails.commons.ConfigurationHolder
类${className}控制器{
静态allowedMethods=[保存：“发布”，更新：“发布”，删除：“发布”]^M
def导出服务
...
def导出={attrs->
def response=attrs.response
列表字段=[]
什么是
事件
类？有导入吗？
检查您的域类的语法错误。确保在域类中包含了必要的包，在您的示例中是package org.example。
您是对的！我查找了它，结果发现我需要在Controller.groove顶部包含以下行y:
<%=packageName ? "package ${packageName}\n\n" : ''%>

// import needed for export plugin
import org.codehaus.groovy.grails.commons.ConfigurationHolder

class ${className}Controller {

    static allowedMethods = [save: "POST", update: "POST", delete: "POST"]^M

    def exportService

    ...

    def export = {attrs ->
    def response = attrs.response
    List fields = []
    <% excludedProps = Event.allEvents.toList() << 'version'
       allowedNames = domainClass.persistentProperties*.name << 'id' << 'dateCreated' << 'lastUpdated'
       props = domainClass.properties.findAll { allowedNames.contains(it.name) && !excludedProps.contains(it.name) && !Collection.isAssignableFrom(it.type) }
       Collections.sort(props, comparator.constructors[0].newInstance([domainClass] as Object[]))
       props.eachWithIndex {p, i -> %>fields.push("${p.name}"<%="\n"%><% } %>
       Map labels = [:]
       <% props.eachWithIndex { p, i -> %>labels.putAt("\${p.name}", "\${p.naturalName}")<%="\n "%><% } %>

       Map formatters = [:]
       Map parameters = [:]
       response.setHeader("Content-disposition", "attachment; filename=${domainClass.propertyName}s.\${attrs.extension}")
       if("\${attrs.extension}" == "xml") {
            exportService.export(attrs.format, response.outputStream, attrs.exportList, fields, [:], formatters, parameters)
       } else {
            exportService.export(attrs.format, response.outputStream, attrs.exportList, fields, labels, formatters, parameters)
       }
    }
...
}