ruby – 如何确定定义方法的类？

发布时间：2020-12-16 23:23:44 所属栏目：百科来源：网络整理

导读：我想动态确定当前方法定义的类. 这是我正在尝试做的一个静态示例： class A def foo puts "I was defined in A" endendclass B A def foo puts "I was defined in B" super endendA.new.foo# I was defined in AB.new.foo# I was defined in B# I was define

我想动态确定当前方法定义的类.

这是我正在尝试做的一个静态示例：

class A
  def foo
    puts "I was defined in A"
  end
end

class B < A
  def foo
    puts "I was defined in B"
    super
  end
end

A.new.foo
# I was defined in A

B.new.foo
# I was defined in B
# I was defined in A  <- this is the tricky one

如何用动态表达式替换上面字符串中的A和B？

显然,#{self.class}不起作用. (它会打印我在B中定义为B两次)

我怀疑答案是“你不能”,但也许我忽略了一些东西.

解决方法

那这个呢？

class A
  def foo
    puts "I was defined in #{Module.nesting.first}"
  end
end

class B < A
  def foo
    puts "I was defined in #{Module.nesting.first}"
    super
  end
end

更正了WandMaker的建议.

（编辑：李大同）

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