如何确定一个方法定义的类？

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

我怎么能代替A并B与动态表达的琴弦？

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

我怀疑答案是"你不能",但也许我忽略了一些东西.

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.