Active Model

Totally experimental library that aims to extract common model mixins from ActiveRecord for use in ActiveResource (and other similar libraries).
This is in a very rough state (no autotest or spec rake tasks set up yet), so please excuse the mess.

Here's what I plan to extract:

• ActiveModel::Observing

• ActiveModel::Callbacks

• ActiveModel::Validations

  for ActiveResource params and ActiveRecord options

• ActiveModel::Scoping

  to_json, to_xml, etc

• ActiveModel::Serialization

I'm trying to keep ActiveRecord compatibility where possible, but I'm annotating the spots where I'm diverging a bit.