Question

我正在研究一个具有一些复杂类/ mixin层次结构的系统。由于有许多层分散在许多不同的文件中，我想快速查看给定方法的超级调用链。

例如

module AAA
  def to_s
    "AAA " + super()
  end
end

module BBB
  def to_s
    "BBB " + super()
  end
end

class MyArray < Array
  include AAA
  include BBB

  def to_s
    "MyArray " + super()
  end
end

> MyArray.new.to_s
=> "MyArray BBB AAA []"
> method_supers(MyArray,:to_s)
=> ["MyArray#to_s", "BBB#to_s", "AAA#to_s", "Array#to_s", ...]

Answer 1

也许是这样的？

class A
  def foo; p :A; end
end

module B
  def foo; p :B; super; end
end

module C; end

class D < A
  include B, C
  def foo; p :D; super; end
end

p D.ancestors.keep_if { |c| c.instance_methods.include? :foo }  # [D, B, A]

如果这看似正确，你可以相应地修改这个功能：

def Object.super_methods(method)
  ancestors.keep_if { |c| c.instance_methods.include? method }
end

p D.super_methods(:foo)  # [D, B, A]

Answer 2

def method_supers(child_class,method_name)
  ancestry = child_class.ancestors

  methods = ancestry.map do |ancestor|
    begin
      ancestor.instance_method(method_name)
    rescue
      nil
    end
  end

  methods.reject!(&:nil?)

  methods.map {|m| m.owner.name + "#" + m.name.to_s}
end

ruby中某个类方法的已定义超类方法列表

2 个答案: