SessionExpiration is plugin that allows you to expire sessions after X seconds of inactivity. Useful for when you want to automatically log out users if they're idle.

Installation:

script/plugin install http://svn.intridea.com/svn/public/session_expiration

OR

cd vendor/plugins
svn co http://svn.intridea.com/svn/public/session_expiration

Specify when to expire session in your ApplicationController to do it site wide or you can do it for specific controllers:

class ApplicationController
  expire_session_in 5.minutes
end

If you want to run a method when the session expires use this:

class ApplicationController
  expire_session_in 5.minutes, :after_expiration => :some_method
	
  def some_method
    flash[:notice] = "You have been logged out due to inactivity"
  end
end