A simple plugin which creates revisions of your model and comes with an equally simple differ.
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README.md

Revision-San

A simple Rails plugin which creates revisions of your model and comes with an equally simple HTML differ.

Install

$ gem install revision-san

Usage

Include the RevisionSan module into the model for which you'd like to keep revisions.

class Artist < ActiveRecord::Base
  include RevisionSan
end

And create a migration to add the columns needed by Revision-San to your model:

add_column :artists, :revision, :integer,           :default => 1
add_column :artists, :revision_parent_id, :integer, :default => nil

add_index  :artists, :revision_parent_id