ruby – 如何确定定义方法的类？

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

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.

原文地址：https://www.jb51.cc/ruby/264740.html