Notes: how to setup user based subdomain, http://stackoverflow.com/a/7265381/219065

gistfile1.rb

module AppName
  class UserSubdomainConstraint
    def self.matches?( request )
      request.subdomain.present? && request.subdomain != 'www'
    end
  end
end

AppName::Application.routes.draw do
  devise_for :users

  constraints(AppName::UserSubdomainConstraint) do
    # THESE ARE THE ROUTES FOR USERS' SUBDOMAINS
  end
end

def index
  @user_account = User.where(:subdomain => request.subdomain).account
end