snippet.rb

class ActiveRecord::Base
  def self.soft_destroyable(column = :destroyed_at)
    define_method(:destroy_without_callbacks) do
      update_attribute(column, Time.now)
    end
    
    named_scope :destroyed, :conditions => ["NOT #{column} IS NULL", column]
    named_scope :not_destroyed, :conditions => ["#{column} IS NULL", column]
  end
end