From: "marcandre (Marc-Andre Lafortune)" <ruby-core@...>
Date: 2013-03-06T02:39:50+09:00
Subject: [ruby-core:53150] [ruby-trunk - Feature #7836] Need a way to get Method and UnboundMethod objects to methods overridden by prepended modules


Issue #7836 has been updated by marcandre (Marc-Andre Lafortune).

Category set to core
Target version set to current: 2.1.0

nobu: Patch looks good, but I would go further and have `String.instance_method(:object_id, false)` also raise a NameError, for consistency with `String.instance_methods(false).include? :object_id # => false`.

Did Matz confirm any of this?
----------------------------------------
Feature #7836: Need a way to get Method and UnboundMethod objects to methods overridden by prepended modules
https://bugs.ruby-lang.org/issues/7836#change-37312

Author: banister (john mair)
Status: Open
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: core
Target version: current: 2.1.0


=begin
See the following code:

  module P
    def hello
      puts "from P"
      super
    end
  end

  class A
    def hello
      puts 'from A'
    end

    prepend P
  end

  A.instance_method(:hello).source_location == P.instance_method(:hello).source_location  #=> true

== Discussion

Since (({A.instance_method(:hello)})) effectively returns (({P.instance_method(:hello)})) it is impossible to get an (({UnboundMethod})) object to the original (({A#hello})) method.

Tools like ((<[Pry]|URL:http://pryrepl.org>)) need to access (({UnboundMethod})) objects to every active method in the system for debugging purposes.

== Possible solution

Simply allow (({instance_method()})) to take a second boolean parameter, indicating whether methods injected by prepended modules are to be included, it would default to true:

example:

  A.instance_method(:hello) #=> same as P#hello
  A.instance_method(:hello, false) #=> return strictly A#hello

=end



-- 
http://bugs.ruby-lang.org/