gistfile1.txt

require 'mongoid'

def ArrayOf(klass)
  array_klass_name = "#{klass}Array"
  array_klass = Object.const_set(array_klass_name.to_sym, Class.new(Array))
  array_klass.class_eval do
    def self.demongoize(obj)
      new(obj.map {|e| klass.demongoize(e)})
    end
  end
  array_klass
end

class MyDoc
  def initialize
    @paragraphs = ArrayOf(String).new
  end
end

d = MyDoc.new