gistfile1.rb

  # Create the associations for individual body_metrics and accept their nested
  # attributes. This makes the biometrics form work and a few other things.
  Dir['app/models/body_metric/*.rb'].collect { |file| File.basename(file).sub /\.rb/, '' }.each do |metric|
    has_one :"current_#{metric}", -> { latest }, class_name: "BodyMetric::#{metric.camelize}"
    accepts_nested_attributes_for :"current_#{metric}"
    define_method("current_#{metric}") do
      super() || self.send(:"build_current_#{metric}")
    end
  end