CODEWITHSUNDEEP
grails
sullivan
sullivan

Reputation: 360

Override Grails redirect method

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.

Upvotes: 0

Views: 627

Answers (1)

Joshua Moore
Joshua Moore

Reputation: 24776

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.

Upvotes: 1

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