Rails 2.3.x nested transaction rollback

gistfile1.txt

# File 1.rb, use rails 2.3.10

require 'config/environment'

puts Message.count

Message.transaction do
  Message.create! :author => 'test', :text => 'test'

  Message.transaction do
    Message.create! :author => 'test', :text => 'test'
    raise ActiveRecord::Rollback
  end

end

puts Message.count

$ ruby 1.rb 
0
2