Override Grails redirect method

Question

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 wi

Answer 1

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.