vendors.rb

require "rubygems"
gem "activerecord", "= 2.3.5"
gem "activerecord-oracle_enhanced-adapter", "= 1.2.3"
require "active_record"

ActiveRecord::Base.logger = Logger.new(STDOUT)
ActiveRecord::Base.establish_connection( :adapter => "oracle_enhanced",
  :database => "orcl", :username => "hr", :password => "hr")

ActiveRecord::Base.connection.instance_eval do
  create_table :policies, :force => true do |t| 
    t.string :name
  end

  create_table :vendors, :force => true do |t| 
    t.string :name
    t.integer :policy_id
  end
end

class Policy < ActiveRecord::Base
  has_many :vendors
end

class Vendor < ActiveRecord::Base
  belongs_to :policy
end

p1 = Policy.create(:name => 'Policy 1')
p2 = Policy.create(:name => 'Policy 2')
Vendor.create(:name => 'Vendor 1', :policy => p1)
Vendor.create(:name => 'Vendor 2', :policy => p1)
Vendor.create(:name => 'Vendor 3', :policy => p2)

Vendor.all(:include => [:policy]).each do |v| 
  v.policy
end