Representable gem: trouble handling nested documents (hashes)

Question

I'm using the Representable gem and am following the instructions in the readme for accessing properties in a nested document.

Representer and test:

# app/representers/nhl/game_representer.rb

require 'representable/hash'

module Nhl::GameRepresenter
  include Representable::Hash
  include Representable::Hash::AllowSymbols

  property :stats_id, as: :eventId

  nested :venue do
    property :venue_id, as: :venueId
  end
end

# test/models/nhl/game_test.rb

class Nhl::GameTest < ActiveSupport::TestCase
  context 'initializing w/Representer' do
    should 'map attributes correctly' do
      real_hash = {
        :eventId => 1553247,
        venue: {
          :venueId=>28,
          :name=>"Air Canada Centre"
        }
      }

      game = Nhl::Game.new.extend(Nhl::GameRepresenter).from_hash(real_hash)

      assert_equal 1553247, game.stats_id
      assert_equal 28, game.venue_id
    end
  end
end

Here the first assertion passes but the second one (venue) fails. It seems that my nested block just isn't doing anything because game.venue_id ends up being nil.

Looking back at the readme, I realized it says:

"Note that ::nested internally is implemented using Decorator."

...and the code example uses Class SongRepresenter < Representable::Decorator. So I rewrote my representer like this:

class Nhl::GameRepresenter < Representable::Decorator # <--- change to class
  include Representable::Hash
  include Representable::Hash::AllowSymbols

  property :stats_id, as: :eventId

  nested :venue do
    property :venue_id, as: :venueId
  end
end

In my test, I then set up the game object like this:

game = Nhl::GameRepresenter.new(Nhl::Game.new).from_hash(real_hash)

However, I'm still getting the same problem: game.venue # => nil

Can anyone with more experience using this gem point out what I'm doing wrong??