Metadata pattern

gistfile1.rb

class SomeModel < ActiveRecord::Base
  # These are all the things I tend to add to my activerecord model for the metadata (extension table) pattern
  has_one :metadata, autosave: true, dependent: :destroy, class_name: 'SomeModelMetadata'
  def metadata_with_creation
    metadata_without_creation || build_metadata
  end
  alias_method_chain :metadata, :creation

  delegate :html, :html=, :html?,
           :start_at, :start_at=, :start_at?,
           :finish_at, :finish_at=, :finish_at?,
           to: :metadata

  accepts_nested_attributes_for :metadata

  # Here's one sort of generic version of inspect, but I usually end up specifying specific attributes anyway
  def inspect
    inspection = %w[html start_at finish_at].map do |name|
      "#{ name }: #{ attribute_for_inspect(name) }"
    end
    super.gsub('>', inspection.join(', ') + '>')
  end
end