routes.rb

  with_es_subdomains = ['elaposentoalto']
  with_es_subdomains.each do |subdomain|
    match "" => redirect("/es"), :constraints => { :subdomain => subdomain }
    match "/:one" => redirect("/es/%{one}"), :constraints => lambda{ |req| req.host =~ /^#{subdomain}\./ && !(req.env["REQUEST_URI"] =~ /^\/es$/) }
    match "/:one.:format" => redirect("/es/%{one}.%{format}"), :constraints => lambda{ |req| req.host =~ /^#{subdomain}\./ && !(req.env["REQUEST_URI"] =~ /^\/es\./) }
    match "/:one/*path" => redirect("/es/%{one}/%{path}"), :constraints => lambda{ |req| req.host =~ /^#{subdomain}\./ && !(req.env["REQUEST_URI"] =~ /^\/es\//) }
  end