Decorate an Enumerable collection

decorator.rb

class FancyDecorator < SimpleDelegator
  def full_name
     "#{first_name} #{last_name}"
  end
  
  def last_name_first
    "#{last_name}, #{first_name}"
  end
  
  def self.decorate_collection(collection)
    DecoratableCollectionProxy.new collection
  end
  
  class DecoratableCollectionProxy < SimpleDelegator
    def each
      __getobj__.each do |object|
        yield FancyDecorator.new object
      end
    end
  end