NoMethodError when session kept in cookie is recovered

[yebihara]

My environment:
ruby 1.8.7 + Rails 2.3.8

I met the following error when a session kept in cookie is recovered.

F, [2010-08-03T19:40:02.937000 #2624] FATAL -- :
NoMethodError (undefined method remember_token?' for true:TrueClass): lib/authenticated_system.rb:130:inlogin_from_cookie'
lib/authenticated_system.rb:12:in current_user' lib/authenticated_system.rb:6:inlogged_in?'
lib/authenticated_system.rb:35:in authorized?' lib/authenticated_system.rb:53:inlogin_required'

The error occurs because "true" is set to "user" variable in the following block in lib/authenticated_system.rb.

def login_from_cookie
  user = !cookies[:auth_token].blank? and User.find_by_remember_token(cookies[:auth_token])
  if user && user.remember_token?

The error disappeared after I replaced 'and' with '&&' as follows.

  user = !cookies[:auth_token].blank? && User.find_by_remember_token(cookies[:auth_token])

This may depend on ruby version or something.

Thanks,

ebi