Allows you to store blobs off-model for performance reasons, but still access them in a pretty way.

blob_awesome.rb

class ProductPage < ActiveRecord::Base
  has_many :text, :class_name => 'ProductPageContent' do
    def [] name
      name = name.to_s
      find_by_field_name(name).body
    end

    def []= name, body
      name = name.to_s
      contents = find_or_initialize_by_field_name name
      contents.write_attribute(:body, body)
      contents.save
      body
    end
  end

  def text_attributes= attrs
    attrs.each { |key,value| self.text[key]=value }
  end
end

example.txt

>> ProductPage.first.text[:full_description] = 'Hello'
  ProductPage Load (0.3ms)   SELECT * FROM `product_pages` LIMIT 1
  ProductPageContent Load (0.2ms)   SELECT * FROM `product_page_contents` WHERE (`product_page_contents`.`field_name` = 'full_description') AND (`product_page_contents`.product_page_id = 430) LIMIT 1
  ProductPageContent Create (0.2ms)   INSERT INTO `product_page_contents` (`updated_at`, `body`, `product_page_id`, `field_name`, `created_at`) VALUES('2009-10-20 09:57:34', 'Hello', 430, 'full_description', '2009-10-20 09:57:34')
=> "Hello"

>> ProductPage.first.text[:full_description]
=> "Hello"