ActiveRecord extension to print FactoryGirl definition!

to_factory_girl.rb

class ActiveRecord::Base
  # Usage:
  #
  #     > puts User.first.to_factory_girl
  #     FactoryGirl.define do
  #       factory :user do
  #         ...
  #       end
  #     end
  #     # Usage: FactoryGirl.create(:user, ...)
  def to_factory_girl
    ignores = %w(id created_at updated_at)
    array = []
    array << "# encoding: utf-8"
    array << "FactoryGirl.define do"

    factory_name = self.class.model_name.underscore
    unless factory_name =~ %r|/|
      array << "  factory :#{factory_name} do"
    else
      factory_name.gsub!('/', '_')
      array << "  factory :#{factory_name}, :class => #{self.class.name} do"
    end

    attributes.each do |key, value|
      next if ignores.include?(key)
      if key =~ /_id$/
        array << "    association :#{key.gsub(/_id$/, '')}"
      else
        array << "    #{key} #{value.inspect}"
      end
    end
    array << "  end"
    array << "end"

    usage = ""
    usage << "# Usage: FactoryGirl.create(:#{factory_name}"
    attributes.each do |key, value|
      next if ignores.include?(key)
      if key =~ /_id$/
        factory_name = key.gsub(/_id$/, '')
        usage << ", #{factory_name}: FactoryGirl.create(:#{factory_name})"
      else
        usage << ", #{key}: #{value.inspect}"
      end
    end
    usage << ")"
    array << usage

    array.join("\n")
  end
  alias_method :to_fg, :to_factory_girl
end