如何确定定义方法的类? [英] How to determine the class a method was defined in?

问题描述

我想动态确定定义当前方法的类.

I would like to dynamically determine the class the current method was defined in.

这是我正在尝试做的静态示例:

Here's a static example of what I'm trying to do:

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?

How can I replace A and B in the strings above with a dynamic expression?

显然，#{self.class} 不起作用.(它会为 B 打印两次 I was defined in B)

Apparently, #{self.class} does not work. (it would print I was defined in B twice for B)

我怀疑答案是你不能"，但也许我忽略了一些东西.

I suspect that the answer is "you can't", but maybe I'm overlooking something.

推荐答案

这个怎么样?

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

根据 WandMaker 的建议进行了更正.

Corrected following WandMaker's suggestion.

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