Loading production environment (Rails 2.3.4)
>> u = User.new
=> #<User contribution_count: nil, crypted_password: nil, reset_password_code_until: nil, _id: nil, username: nil, reset_password_code: nil, email: nil>
>> u.valid?
NameError: uninitialized constant MongoMapper::EmbeddedDocument::ClassMethods::ObjectId
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/mongo_mapper-0.6.1/lib/mongo_mapper/embedded_document.rb:66:in `object_id_key?'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/mongo_mapper-0.6.1/lib/mongo_mapper/finder_options.rb:63:in `to_mongo_criteria'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/mongo_mapper-0.6.1/lib/mongo_mapper/finder_options.rb:60:in `each_pair'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/mongo_mapper-0.6.1/lib/mongo_mapper/finder_options.rb:60:in `to_mongo_criteria'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/mongo_mapper-0.6.1/lib/mongo_mapper/finder_options.rb:38:in `criteria'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/mongo_mapper-0.6.1/lib/mongo_mapper/finder_options.rb:53:in `to_a'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/mongo_mapper-0.6.1/lib/mongo_mapper/document.rb:413:in `to_finder_options'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/mongo_mapper-0.6.1/lib/mongo_mapper/document.rb:366:in `find_one'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/mongo_mapper-0.6.1/lib/mongo_mapper/document.rb:102:in `first'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/mongo_mapper-0.6.1/lib/mongo_mapper/validations.rb:17:in `valid?'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/jnunemaker-validatable-1.8.1/lib/validatable/validatable_instance_methods.rb:84:in `run_validation'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/jnunemaker-validatable-1.8.1/lib/validatable/validatable_instance_methods.rb:77:in `validate_group'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/jnunemaker-validatable-1.8.1/lib/validatable/validatable_instance_methods.rb:76:in `each'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/jnunemaker-validatable-1.8.1/lib/validatable/validatable_instance_methods.rb:76:in `validate_group'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/jnunemaker-validatable-1.8.1/lib/validatable/validatable_instance_methods.rb:75:in `each'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/jnunemaker-validatable-1.8.1/lib/validatable/validatable_instance_methods.rb:75:in `validate_group'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/jnunemaker-validatable-1.8.1/lib/validatable/validatable_instance_methods.rb:35:in `valid_for_group?'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/jnunemaker-validatable-1.8.1/lib/validatable/validatable_instance_methods.rb:15:in `valid?'
	from /opt/ruby-enterprise-1.8.7-2009.10/lib/ruby/gems/1.8/gems/mongo_mapper-0.6.1/lib/mongo_mapper/callbacks.rb:51:in `valid?'
	from (irb):2>>