private
  def login_as_trial_user
    name = "anonymous_#{rand}_#{Time.now}_#{rand}"
    if User.find_by_username(name)
      UserSession.create(User.find_by_username(name),true)
    else
      guest_role = User.create(:username => name, :password => name, :password_confirmation => name, :role => "guest", :email => "change@this.com")
      UserSession.create(guest_role, true)
    end
    @current_user_session = UserSession.find
    guest_role
  end

  def require_login
    login_as_trial_user unless current_user_session
  end