bruce/migration-down.rb

## migration-down.rb
class AClassicPattern < ActiveRecord::Migration

  def self.up
    # ...
  end

  def self.down
    raise NotImplementedError, "There is no undo"
  end

end
	class AClassicPattern < ActiveRecord::Migration

	def self.up
	# ...
	end

	def self.down
	raise NotImplementedError, "There is no undo"
	end

	end