覆盖Grails重定向方法 [英] Override Grails redirect method

问题描述

我在URL中携带了我的Grails应用程序的语言环境，例如

http://myapp.com/LANG/controller/action/id 。

因此，我用语言属性调整URLMappings.groovy。因为我想保存工作并且不在每个链接上应用lang参数，所以我已经用params.lang中的语言覆盖了g：link taglib。这很好。

当我从控制器进行重定向时，比如

  redirect（action：logout）
  

我想追加params .lang自动而不是每次都写

  redirect（action：logout，params：[lang：params.lang]） 
  

我找到了线程 grails覆盖重定向控制器方法，但我不确定如何继续。

如何覆盖redirect（）方法并添加params.lang-attribute？

请指教，非常感谢。

解决方案

在您的应用程序中执行此操作的最简单方法是为你的Grails应用程序使用一些元编程和 BootStrap.groovy 。以下只是一个简单的例子：

  import org.codehaus.groovy.grails.web.servlet .GrailsApplicationAttributes 
 
 class BootStrap {
 
 def init = {servletContext  - > 
 def ctx = servletContext.getAttribute（GrailsApplicationAttributes.APPLICATION_CONTEXT）
 def app = ctx.getBean（grailsApplication）
 app.controllerClasses.each（）{controllerClass  - > 
 def oldRedirect = controllerClass.metaClass.pickMethod（redirect，[Map] as Class []）
 controllerClass.metaClass.redirect = {Map args  - > 
 //新的预重定向逻辑
 if（！args ['params']）args ['params'] = [：] //以防万一在没有任何参数的情况下调用重定向
 args ['params'] ['whatever'] ='something'//向参数映射中添加内容
 
 oldRedirect.invoke委托，参数
 //新的重定向逻辑
 
 
 
 $ b def destroy = {
} 
} 
  

上面的例子仅包含了Grails应用程序中所有控制器上的 redirect 的实现，并注入了一个名为任何与的东西。

以上是使用Grails 2.4.2测试（快速）。

I'm carrying the locale of my Grails application in the URL, such as

http://myapp.com/LANG/controller/action/id.

Therefore, I adjusted the URLMappings.groovy with the language attribute. Since I would like to save work and don't apply the lang parameter at every link, I have overridden the g:link taglib with the language from params.lang. This works pretty good.

When I do a redirect from a controller, such as

redirect(action: "logout")

I'd like to append the params.lang automatically instead of writing every time

redirect(action: "logout", params: [lang: params.lang])

I found the thread grails override redirect controller method, but I'm unsure how to proceed. Where does this code take part?

How can I override the redirect() method and add the params.lang-attribute?

Please advice, thank you very much.

解决方案

The easiest way to do this in your application would be to use a bit of meta programming and the BootStrap.groovy for your Grails application. The following is just a simple example of what that might look like:

import org.codehaus.groovy.grails.web.servlet.GrailsApplicationAttributes

class BootStrap {

    def init = { servletContext ->
        def ctx = servletContext.getAttribute(GrailsApplicationAttributes.APPLICATION_CONTEXT)
        def app = ctx.getBean("grailsApplication")
        app.controllerClasses.each() { controllerClass ->
            def oldRedirect = controllerClass.metaClass.pickMethod("redirect", [Map] as Class[])
            controllerClass.metaClass.redirect = { Map args ->
               // new pre-redirect logic
               if (!args['params']) args['params'] = [:] // just in case redirect was called without any parameters
               args['params']['whatever'] = 'something' // add something into the parameters map

               oldRedirect.invoke delegate, args
               // new post-redirect logic
            }
        }

    }
    def destroy = {
    }
}

The above example just wraps the implementation for redirect on all controllers within your Grails application and injects a new parameter called whatever with the value of something.

The above was tested (quickly) using Grails 2.4.2.

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