I came across this question in "Rails Weenie" site and because there is no good answer for it there, here is my 2cents:

I have an application that will have multi-language views spanish, english, etc. What i want to do is the next thing, on the views folder i want to create a folder named “spanish”, another one named “english”, etc. These folders will contain all the rhtml files of each language. But, the problem is...

When i want to acces the main page i will be redirected to the view of the language selected. For example, in PHP i will do something like this:

$language=”spanish”;
$url_to_show=”$language/index.php”;

On rails i have a controller with a function named index, and it shows the view “index.rhtml”... but i want to show the index.rhtml that is inside of the selected language folder

Is it possible?

Yes it is. And exactly the way you described with php:

I suppose that you are familiar with Rails (creating projects, controllers,...etc)

We create a project called "myproject", we start WEBrick and we generate a controller named "test"
[root@mylinux]#rails myproject
[root@mylinux]#cd myproject
[root@mylinux myproject]#ruby script/server
[root@mylinux myproject]#ruby script/generate controller test

Create folders for your languages:
[root@mylinux myproject]#mkdir app/views/test/english
[root@mylinux myproject]#mkdir app/views/test/french

Create the english index.rhtml:
[root@mylinux myproject]#vi app/views/test/english/index.rhtml

Hi,

This is the english version.

Thanks.

Create the french version:
[root@mylinux myproject]#vi app/views/test/french/index.rhtml

Bonjour,

Ceci est la version francaise.

Merci.

Here is the solution (I create an action called "mustap" for testing):
[root@mylinux myproject]#vi app/controllers/test_controller.rb

class TestController < ApplicationController

    def mustap
        render :template => "test/" + @params["lang"] + "/index"
    end
end

And now point your browser to these URLs:
http://localhost:3000/test/mustap/?lang=english
http://localhost:3000/test/mustap/?lang=french
Dadaaa!

UPDATE: This answer was selected as the best answer at "Rails Weenie"