Ruby on Rails

Hello,

can someone help, please, how to work with Active Record?
I'm trying under this page
-http://guides.rubyonrails.org/active_record_querying.html#retrieving-a-single-object
- building query on database, but I'm getting errors always, when I try
to use some command except .new, .save, .find, .all.

in application.rb I have:

require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "active_resource/railtie"
require "rails/test_unit/railtie"

in my model I have:

class Example < ActiveRecord::Base
include MongoMapper::Document
key :name
end

And now if I try:

exam= Example.order("name_at ASC") #--> undefined method `spec' for
nil:NilClass (that is in a view)

exam= Example.all

I guess everything for work with AR is ready, but I don't now, why
commands as .order, .where, .first etc not works... :(

I'm using Rails 3.0.5 and MongoDB.

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