gistfile1.rb

class UsersController < Clearance::UsersController
  def create
    ...
    sign_in(@user)
  end
end

class ParticipationsController < ApplicationController
  protected
  def ensure_signed_in
    unless signed_in?
      store_location
      flash[:failure] = "Please sign in to participate in this deal."
      redirect_to sign_in_path
    end
  end
end

module NavigationHelper
  def authentication_links
    if signed_in?
      signed_in_links
    else
      signed_out_links
    end
  end

  def signed_out_links
    [link_to("Sign up", sign_up_path),
     link_to("Sign in", sign_in_path)]
  end

  def signed_in_links
    [link_to("My Account", edit_user_path(current_user)),
     link_to("Sign out",   sign_out_path)]
  end
end