gistfile1.rb

require 'ostruct'

class Pearl < OpenStruct
  alias_method :open_structs_method_missing, :method_missing
  
  def method_missing(meth, *args)
    if meth.to_s =~ /=$/
      open_structs_method_missing(meth, *args)
    else
      self.new_ostruct_member(meth)
      new_child = Pearl.new(args)
      self.send(meth.to_s+"=", new_child)
      return new_child
    end
  end
end

# 
irb(main):017:0> a = Pearl.new
=> #<Pearl>
irb(main):018:0> a.pants.belt.buckle.burst = true
=> true
irb(main):019:0> a
=> #<Pearl pants=#<Pearl ...>>
irb(main):020:0> a.pants
=> #<Pearl belt=#<Pearl ...>>
irb(main):021:0> a.pants.chores = 4
=> 4
irb(main):022:0> a.pants
=> #<Pearl chores=4, belt=#<Pearl ...>>
irb(main):023:0> a.pants.chores
=> 4