AuthLogic - how to determine current user id throughout the system?

I have set up AuthLogic almost exactly as per the AuthLogic example app at http://github.com/binarylogic/authlogic_example.

After someone logs in as User, they can click on links that send them away into the system and away from the users controller. This is an 开发者_StackOverflow中文版incredibly noob question, but how can I access that User's ID and other attributes from anywhere else, such as an unrelated view or unrelated controller?

An example of what I'd like to do:

#matchings controller
@matching = Matching.find_by_user_id(user.id)

You can use current_user or @current_user. The function that returns current_user is defined in application controller.

...
  private
  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
...

So, you can use: @matching = Matching.find_by_user_id(current_user.id) or
@matching = Matching.find_by_user(current_user)