Different '/' root path for users depending if they are authenticated (using devise)

I'm writing a rails app in which I have an Editor and a Publication model. I'm using devise for editors authentication and, since an editor can't do anything as guest, I wrote a custom layout to use for the login page and I want that a guest user can see only the login page.

Now I'm trying to achieve the following behavior in my app but unsuccessfully:

require 'spec_helper'
require 'capybara/rails'

describe "Authentication" do

  describe "when logged in" do
    before(:each) do
      @editor = Factory(:editor, :password => 'secret')
      visit '/'
      fill_in 'Login', :with => @editor.login
      fill_in 'Password', :with => 'secret'
      click_button 'Sign in'
      page.should have_content('Signed in successfully.')
    end

    it "getting / should render publication page with no redirection" do
      visit '/'
      page.should_not have_content('Login')
      page.should have_content('Publications')
      # assert that there is no redirection
      page.current_path.should == '/'
    end

    it "visits the sign_in page should redirect to /" do
      visit '/editors/sign_in'
      page.should have_content('Publications')
      page.current_path.should == '/'
    end

  end

  describe "when not logged in" do
    it "getting / should not display the sign in warning" do
      visit '/'
      # I want to get rid of this message
      page.should_not have_content('You need to sign in or sign up before continuing.')
    end

    it "getting / should not redirect to the sign_in default page" do
      visit '/'
      page.should have_content('Login')
      # assert that there is no redirection
      page.current_path.should == '/'
    end

    it "getting the the sign_in default path works" do
      visit '/editors/sign_in'
      page.should have_content('Login')
      page.current_path.should == '/editors/sign_in'
    end

    it "login works and redirect me to the publications page (with /)" do
      @editor = Factory(:editor