我怎么写这个`method_missing`？

Question

我有一个类Wrapper,它支持添加选项,然后您可以查找.它将这些选项存储在内部哈希中@dict.

w = Wrapper.new
w.foo # => NameError
w.foo = 10
w.foo # => 10

如何编写method_missingfor Wrapper以便我可以支持嵌套调用@dict？

w = Wrapper.new
w.foo.bar.baz = 1000
w.foo.bar.baz # => 1000

Answer 1

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class Wrapper
  def initialize(d={})
    @dict = d
  end

  def method_missing(method, *args)
    if method.to_s =~ /=$/
      @dict[method.to_s.match(/^(.*)=$/)[1].to_sym] = args.first
    else
      @dict[method] ||= Wrapper.new
    end
  end
end

w = Wrapper.new
w.foo = 5
w.foo #=> 5
w.x.y.z = 32
w.x.y.w = 43
w.x.y.z #=> 32
w.x.y.w #=> 43