Grails 3从服务调用taglib [英] Grails 3 call taglib from a service

问题描述

我正在尝试从服务中使用grails内部taglib，但收到此错误:

I'm trying to use grails internal taglib from a service but I receive this error:

No signature of method: MyService.message() is applicable for argument types: (java.util.LinkedHashMap) values: [[code:default.app.name]]

这是我正在使用的代码:

This is the code I'm using:

class MyService {

    def myMethod() {
        def appName = message(code: 'default.app.name')
    }

}

推荐答案

Grails 3

解决方案是注入 grailsApplication 对象并使用其上下文获取

The solution is to inject the grailsApplication object and use its context to get the taglib bean:

class MyService {

    def grailsApplication

    def myMethod() {
        def g = grailsApplication.mainContext.getBean('org.grails.plugins.web.taglib.ApplicationTagLib')
        def appName = g.message(code: 'default.app.name')
    }

}

Grails 2

使用较旧的grails版本时，类包为

With older grails version the class package is slightly different:

def g = grailsApplication.mainContext.getBean('org.codehaus.groovy.grails.plugins.web.taglib.ApplicationTagLib')

如果您尝试在更新的grails版本(3+)中使用此软件包，则会收到错误消息:

If you try to use this package with newer grails version (3+), you'll receive an error:

No bean named 'org.codehaus.groovy.grails.plugins.web.taglib.ApplicationTagLib' is defined.    

自定义标签库

对于任何版本，如果您需要使用服务中的自定义taglib，只需使用以下代码即可:

With any version, if you need to use your custom taglib from a service just use a code like this:

def c = grailsApplication.mainContext.getBean('my.pkg.HelpfulTagLib')

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