Session cookies, the Rails-2 kind, are transient because that's safer. In some applications safety isn't important. The following makes the session cookies persist for a year.
class ApplicationController < ActionController::Base
before_filter :update_session_expiration_date
private
def update_session_expiration_date
unless ActionController::Base.session_options[:session_expires]
ActionController::Base.session_options[:session_expires] = 1.year.from_now
end
end
end
