More "proper" than a miniskirt (http://gist.github.com/273579).

minidress.rb

# More "proper" than a miniskirt (http://gist.github.com/273579).
class Minidress
  @@factories = {}
  class << self
    def define(name, &block)
      @@factories[name.to_s] = block
    end

    def build(name, attrs = {})
      new(name.to_s.classify.constantize.new, &@@factories[name.to_s]).record
    end

    def attributes_for(name, attrs = {})
      build(name, attrs).attributes
    end

    def create(name, attrs = {})
      build(name, attrs).tap { |record| record.save }
    end
  end

  attr_reader :record
  def initialize(record)
    @record = record and yield self
  end

  def association(name)
    send name, self.class.create(name)
  end

  def sequence(name)
    send name, yield(@n ||= record.class.maximum(:id).to_i + 1, record)
  end

  private
  def method_missing(name, *value)
    record.send "#{name}=", *(block_given? ? yield(record) : value)
  end
end

def Minidress(name, attrs = {})
  Minidress.create(name, attrs)
end

Factory = Minidress
alias Factory Minidress