如何从Ruby模块中仅导入几个函数? [英] How can I import only a couple of functions from a Ruby module?

问题描述

假设我有一个带有方法的模块:function1，function2，function3.我想导入function1和function2，但不导入function3.有没有办法在红宝石中做到这一点?

Suppose I have a module with the methods : function1,function2,function3. I want to import function1 and function2 but not function3. Is there a way to do this in ruby?

推荐答案

不确定是否有一种干净的方法可以只添加所需的方法，但是可以使用undef_method删除不需要的方法

Not sure if there is a clean way to just add the methods you want, but you can remove the methods that you don't want by using undef_method.

module Foo
  def function1
  end

  def function2
  end

  def function3
  end
end

module MiniFoo
  include Foo
  not_wanted_methods = Foo.instance_methods - %w(function1 function2)
  not_wanted_methods.each {|m| undef_method m}
end

class Whatever
  include MiniFoo
end

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