How to override redirect of grails 3 controller

I want to override(extend) the redirect method of a grails 3 controller.

In grails 2 this was done by overriding the method via metaClass. See Override Grails redirect method

Since grails 3 this is not working anymore.

What I want to achieve: I want to manipulate the argument map that is passed to the redirect method of every controller I implemented (filtered by package name)

Or to be more specific: I want to add/change the mapping param based on some small logic

Solution

I want to override(extend) the redirect method of a grails 3 controller.

You can simply override the method as per usual language rules...

class DemoController {

    // ...

    void redirect(Map m) {
        // do whatever you like here...
    }
}

If you want to invoke the original redirect method you can do that too but you will need to explicitly implement the Controller trait...

import grails.artefact.Controller

class DemoController implements Controller {

    void redirect(Map m) {
        // do whatever you like here before
        // invoking the original redirect...

        // invoke the original redirect...
        Controller.super.redirect m
    }
}