Recurively symbolize ruby object keys

symbolizer.rb

module Symbolizer
  def self.deep_symbolize(object)
    if object.kind_of? Hash
      object.keys.each do |k|
        object[k == "_id" ? :id : k.to_sym] = self.deep_symbolize(object.delete k)
      end
      object
    elsif object.kind_of? Array
      object.map { |e| self.deep_symbolize e }
    else
      object
    end
  end
end

Little trick to convert mongoid "_id" to symbol :id.