Advanced variant support for Piggybak.
In your Gemfile add gem "piggybak_variants"
Run bundle install
Run rake piggybak_variants:install:migrations in your main Rails application.
Migrate the DB rake db:migrate
Add //= require piggybak_variants/piggybak_variants-application to your application.js
Add acts_as_sellable_with_variants to any model that should have variants. You may need to add appropriate attr_accessible settings in your model as well, depending on your attribute accessibility settings.
In the admin, define option configurations and option values for each option, then create variants for your sellable instances.
Finally, add <%= variant_cart_form(@instance) %> to your sellable item's show page to render the cart form. To use dropdowns instead of radio buttons, call <%= variant_cart_form(@instance, :controls => 'dropdowns') %>
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