here is the solution: 
http://vsbabu.org/mt/archives/2005/07/19/oracle_with_active_record.html


Jose Pepe wrote:
> # require AR
> require 'rubygems'
> require_gem 'activerecord'
> 
> ActiveRecord::Base.establish_connection({
>       :adapter  => "mysql",
>       :database => "cocoa",
>       :socket   => "/tmp/mysql.socket",
>       :username => <myusername>,
>       :password => <mypassword>
> })
> 
> # define a simple model
> class Task < ActiveRecord::Base
> end
> 
> I am trying to run this script in ruby that reads a MySQL table, called 
> Tasks, like in this example:
> 
> http://wiki.rubyonrails.com/rails/pages/HowToUseActiveRecordOutsideRails
> 
> I got the following error message:
> irb(main):001:0> Task.create "title" => "Item #1"
> NameError: uninitialized constant Task
>         from (irb):1


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