Path.new.foo.bar.baz.to_a # => [:foo, :bar, :baz]

path_object.rb

class Path < BasicObject

  def initialize(path = [])
    @path = path
  end

  def to_a
    @path.dup
  end

  private

  def method_missing(name, *)
    ::Path.new(to_a << name)
  end
end