Rails - Jul 2013 - Sign in and sign out

Hello,

My name is Javier Molina and I am programming a simple app to manage users 
in Ruby on Rails.
I read RoR Tutorial 
from http://ruby.railstutorial.org/chapters/sign-in-sign-out#top to sign in 
and sign out my app. I implemented the same configuration as it said:

*sessions_helper.rb*
def sign_out    
    self.current_user = nil
    cookies.delete(:remember_token)
end


*sessions_controller.rb*
  def destroy
    sign_out
    redirect_to root_url
  end

*application.html.erb*
<%= link_to "Sign out", signout_path, method: "delete"
%>

*routes.rb*
  match ''/signout'', to: ''sessions#destroy'', 
via: ''delete''

I am able to sign in, but I can''t sign out. The problem is that there
are
not any log error and I don''t know what to do.

Any ideas?

Thanks!

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