grails - 如何在域类中将Taglib调用为函数

Question

我需要从我的域类中调用静态资源插件(http://www.grails.org/Static+Resources+Plugin)。

这在 Controller 中完美地工作:

 def tstLink = resourceLinkTo(dir:"docs/${identifier}",file:originalFileName)

但在域类中，我得到了

Exception Message: No signature of method: static org.maflt.ibidem.Item.resourceLinkTo() is applicable for argument types: (java.util.LinkedHashMap) values: [[dir:docs/19e9ea9d-5fae-4a35-80a2-daedfbc7c2c2, file:2009-11-12_1552.png]] 

我认为这是一个普遍的问题。

那么，如何在域类中将taglib称为函数？

Answer 1

前一段时间，我正在开发的一个应用程序遇到了这个问题。我最终要做的是在服务方法中调用标记:

class MyService {
   def grailsApplication //autowired by spring

   def methodThatUsesATag(identifier, originalFileName) {
      //This is the default grails tag library
      def g = grailsApplication.mainContext.getBean('org.codehaus.groovy.grails.plugins.web.taglib.ApplicationTagLib')

      g.resourceLinkTo(dir:"docs/${identifier}",file:originalFileName)
   }
}

然后在我的域类中，我也可以通过spring Autowiring 进入该服务:

class MyDomain {
    String originalFileName
    def myService  //autowired

    static transients = ['myService'] //Necessary so that GORM doesn't try to persist the service instance.

    //You can create a method at this point that uses your
    //service to return what you need from the domain instance.
    def myMethod() {
       myService.methodThatUsesATag(id, originalFileName)
    }
}