monkey patch for OpenStruct

open_stuct.rb

class OpenStruct
  # Insert/update hash data on the fly.
  #
  #   o = OpenStruct.new
  #   o.merge!(:a => 2)
  #   o.a  #=> 2
  #
  def merge!(other)
    fails TypeError, "can't modify frozen #{self.class}", caller(1) if self.frozen?
    other.each { |k, v| @table[k.to_sym] = v }
    self
  end

  # Merge hash data creating a new OpenStruct object.
  def merge(other)
    o = dup
    o.merge!(other)
    o
  end
end