rails 3.2 link a subdomain to a controller?

Question

Update: rewritten question a bit. Trying to route my subdomains like below

• login.app.ltd
• user1.app.ltd
• user2.app.ltd
• signup.app.ltd

Using

• Rails 3.2
• Devise

To no avail tried several tutorials blog posts, anyone knows a working example for this? Really stuck on this :(

this is my routes now:

 match '', to: 'frontend#index', constraints: lambda { |r| r.subdomain.present? && ( r.subdomain != 'www') }
  #match '' => 'home#index', :constraints => { :subdomain => 'login' }


  constraints :subdomain => /^(?!signup\b)(\w+)/ do
    root :to => "frontend#index"
  end

  root :to => "frontend#index"

Answer 1

My RailsApps project offers a complete example app showing how to use subdomains:

Rails Tutorial for Subdomains with Devise

Did you take a look at that?

config/routes.rb

devise_for :users
resources :users, :only => :show
constraints(Subdomain) do
  match '/' => 'profiles#show'
end
root :to => "home#index"

lib/subdomain.rb

class Subdomain
  def self.matches?(request)
    case request.subdomain
    when 'www', '', nil
      false
    else
      true
    end
  end
end