deletable.rb

module Deletable

  def self.included(base)
      base.class_eval do

        named_scope :are,        :conditions => ['`deleted_at` IS NULL']
        named_scope :deleted,    :conditions => ['`deleted_at` IS NOT NULL']
        named_scope :deleted_at, lambda {|timestamp| {:conditions => ['`deleted_at` = ?',timestamp.to_formatted_s(:db)]}}

        def self.foo
        end

      end
  end

  def mark_as_deleted(timestamp = Time.now.utc)
    update_attribute(:deleted_at, timestamp)
  end

  def restore
    update_attribute(:deleted_at, nil)
  end

  def deleted?
    !!deleted_at
  end

end