ruby - 我可以扩展 Ruby 类以动态地表现得像 OpenStruct 吗？

Question

我有一个包含模块的 Ruby 类。我希望包含的类表现得像 OpenStruct。我如何在不显式继承 OpenStruct 的情况下实现这一目标？

class Book
  include MyModule
end

module MyModule
  def self.included(klass)
    # Make including class behave like OpenStruct
  end
end

代替

class Book < OpenStruct
  include MyModule
end

Answer 1

您可以将您的类不处理的所有方法委托(delegate)给 OpenStruct:

require 'ostruct'

class Test_OS

  def initialize
    @source = OpenStruct.new
  end

  def method_missing(method, *args, &block)
    @source.send(method, *args, &block)
  end

  def own_method
    puts "Hi."
  end

end

t = Test_OS.new
t.foo = 1
p t.foo #=> 1
t.own_method #=> Hi.