rails-acts_as_paranoid

参考
Github
[Github for rails 3.1>https://github.com/goncalossilva/rails3_acts_as_paranoid/tree/rails3.1]]

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。