Lotus Model problem

gistfile1.rb

require 'lotus-model'
require 'lotus/model/adapters/memory_adapter'

module Admin
  module Models
    class Feature 
      include Lotus::Entity
      self.attributes = :name
    end

    class FeatureRepository
      include Lotus::Repository
    end
  end
end

mapping = Lotus::Model::Mapper.new do
  collection :features do
    entity Admin::Models::Feature

    attribute :id,   Integer
    attribute :name, String
  end
end

Admin::Models::FeatureRepository.adapter = Lotus::Model::Adapters::MemoryAdapter.new(mapping)

Admin::Models::FeatureRepository.all  # <= Lotus::Model::Mapping::UnmappedCollectionError: Cannot find collection: