Representable: extend vs. decorate.rb

require 'ostruct'
require 'benchmark'

require 'representable/hash'

# --------- extend

module SongRepresenter
  include Representable::Hash

  property :name
  property :length
  property :track
end

module AlbumRepresenter
  include Representable::Hash

  collection :songs, extend: SongRepresenter
end

class Song
  attr_accessor :name, :length, :track

  def initialize(*options)
    @name, @length, @track = *options
  end
end


# --------- decorate

class SongRepresentation < Representable::Decorator
  include Representable::Hash
  include SongRepresenter
end

class AlbumRepresentation < Representable::Decorator
  include Representable::Hash

  collection :songs, decorator: SongRepresentation
end



for strategy, mod in [[:extend, AlbumRepresenter], [:decorate, AlbumRepresentation]]
  album = OpenStruct.new(:songs => 10000.times.collect { Song.new("Marea", 3.14, "01") } )

  time = Benchmark.measure do
    album = Representable.prepare(album, mod, strategy)
    album.to_hash
  end

  puts "time with #{strategy}  : #{time}"
end

# time with extend  :   0.780000   0.000000   0.780000 (  0.783960)
# time with decorate  :   0.600000   0.000000   0.600000 (  0.601738)