gistfile1.rb

>> fd = User.new
=> #<User id: nil, created_at: nil, updated_at: nil>
>> fd.save
  SQL (0.4ms)  BEGIN
  SQL (10.6ms)  INSERT INTO `users` (`created_at`, `updated_at`) VALUES (?, ?)  [["created_at", Mon, 20 Jun 2011 01:01:40 UTC +00:00], ["updated_at", Mon, 20 Jun 2011 01:01:40 UTC +00:00]]
   (1.6ms)  COMMIT
=> true
>> fd
=> #<User id: 0, created_at: "2011-06-20 01:01:40", updated_at: "2011-06-20 01:01:40">
>> User.find 1
  User Load (2.5ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = ? LIMIT 1  [["id", 1]]
=> #<User id: 1, created_at: "2011-06-20 01:01:40", updated_at: "2011-06-20 01:01:40">

This is on a dummy app with no modifications: just created and rails g scaffold User; rake db:migrate