gistfile1.rb

class CreateUsers < ActiveRecord::Migration
  def self.up
    create_table :users do |t|
      t.string :login, :null => false
      t.string :email, :null => false
      t.string :crypted_password, :null => false
      t.string :password_salt, :null => false
      t.string :persistence_token, :null => false
      t.string :single_access_token, :null => false
      t.string :perishable_token, :null => false

      t.datetime :last_request_at
      t.datetime :current_login_at
      t.datetime :last_login_at
      t.string :current_login_ip
      t.string :last_login_ip

      t.timestamps
    end
  end

  def self.down
    drop_table :users
  end
end

gistfile2.rb

  protect_from_forgery

  helper :all
  helper_method :current_user_session, :current_user, :navigation_data

  private

  def navigation_data
    @work_categories = WorkSeries.find :all
    @personal_categories = PersonalSeries.find :all
  end

  def current_user_session
    return @current_user_session if defined?(@current_user_session)
    @current_user_session = UserSession.find
  end
  
  def current_user
    return @current_user if defined?(@current_user)
    @current_user = current_user_session && current_user_session.record
  end
  
  def require_user
    unless current_user
      store_location
      flash[:notice] = "You must be logged in to access this page"
      redirect_to new_manage_session_url
      return false
    end
  end

  def require_no_user
    if current_user
      store_location
      flash[:notice] = "You must be logged out to access this page"
      redirect_to manage_photos_url
      return false
    end
  end
  
  def store_location
    session[:return_to] = request.request_uri
  end
  
  def redirect_back_or_default(default)
    redirect_to(session[:return_to] || default)
    session[:return_to] = nil
  end