gistfile1.rb

::FixtureReplacement.class_eval do
  def self.insert_defaults
    return if @inserted_fixture_replacement_defaults
    @inserted_fixture_replacement_defaults = true
    @_defaults = {}
    FixtureReplacementController::AttributeCollection.instances.map(&:fixture_name).each do |name|
      insert_default name
    end
  end
  
  def self.insert_default(name)
    current_default = @_defaults[name]
    return current_default if current_default
    @_defaults[name] = FixtureReplacement.send "create_#{name}"
  end
  
  def self.get_default(name)
    @_defaults[name] || insert_default(name)
  end
end

::FixtureReplacementController::DelayedEvaluationProc.class_eval do
  def evaluate(caller)
    default_obj, params = self.call
    FixtureReplacement.get_default(default_obj.fixture_name)
  end
end

::Fixtures.class_eval do
  (class << self; self; end).class_eval do
    def create_fixtures_with_factory_defaults(*args)
      returning create_fixtures_without_factory_defaults(*args) do
        FixtureReplacement.insert_defaults
      end
    end
    alias_method_chain :create_fixtures, :factory_defaults
  end
end