active-hash/active_hash: A readonly ActiveRecord-esque base class that lets you use a hash, a Yaml file or a custom file as the datasource

ActiveHash is a simple base class that allows you to use a ruby hash as a readonly datasource for an ActiveRecord-like model. ActiveHash assumes that every hash has an :id key, which is what you would probably store in a database. This allows you to seamlessly upgrade from ActiveHash objects to full ActiveRecord objects without having to change any code in your app, or any foreign keys in your database.