## config/database.yml

stock_development:
  adapter: mysql
  user: stock
  password: 123456a
  host: localhost
  database: stock_development

## app/models/stock.rb

class Stock < ActiveRecord::Base
  self.abstract_class = true
  establish_connection "stock_development"
end

## app/models/bicycle.rb

class Bicycle < Stock
end

## app/models/doll.rb

class Doll < Stock
  # this would be the dolls table in the stock_development database
end