Soft Delete for Rails (ActiveRecord)

soft_delete.rb

module SoftDelete

  def self.included(within)
    within.class_eval do
      scope :deleted, where("#{quoted_table_name}.deleted_at IS NOT NULL")
      scope :not_deleted, where("#{quoted_table_name}.deleted_at IS NULL")
    end
  end

  def not_deleted!
    raise ActiveRecord::RecordNotFound if deleted?
    self
  end

  def deleted?
    deleted_at?
  end

  def soft_delete!
    update_attribute(:deleted_at, Time.now)
  end

end