rails-acts_as_paranoidの履歴

参考
Github
Github for rails 3.1

1. installing

> vi Gemfile
-----
gem 'rails3_acts_as_paranoid', '~>0.1.4'
-----
:wq

> bundle
...
Installing rails3_acts_as_paranoid (0.1.4)
...
Your bundle is complete! ...

2. setting for migration

vi db/migrate/yyyymmddhhmiss_update_modelname.rb
* yyyymmddhhmiss: replace datetime, modelname: replace real model name
-----
class UpdateModelname < ActiveRecord::Migration
  def self.up
    add_column :modelname, :deleted_at, :datetime
  end
  def self.down
    remove_column :modelname, :deleted_at
  end
end
-----
:wq

> rake db:migrate

3. setting for model

vi app/models/modelname.rb
-----
class Modelname < ActiveRecord::Base
  acts_as_paranoid
end
-----
:wq

> rails server
* require reboots

done!

※一応動作確認出来ました。