From: "rosenfeld (Rodrigo Rosenfeld Rosas)" <rr.rosas@...>
Date: 2012-07-09T22:59:17+09:00
Subject: [ruby-core:46273] [ruby-trunk - Feature #6712] Introduce super! for calling old definition when reopening classes


Issue #6712 has been updated by rosenfeld (Rodrigo Rosenfeld Rosas).


@shyouhei, I think the behavior should be the same as the "prepend" behavior described by @marcandre.

def a
 super! * 3
end

would be a short syntax for

prepend Module.new do
  def a
    super * 3
  end
end

I'm not really worried about what name to use, but I guess most other names would only be possible for 3.0.

Another options could be "old_def", "old_definition", "old_method_definition", "old_super" or anything else you might prefer, I don't really care about the name.

----------------------------------------
Feature #6712: Introduce super! for calling old definition when reopening classes
https://bugs.ruby-lang.org/issues/6712#change-27895

Author: rosenfeld (Rodrigo Rosenfeld Rosas)
Status: Open
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: 
Target version: 2.0.0


ActiveSupport adds support for alias_method_chain which is a hack for being able to call the original method being overriden when reopening a class:

Extracted from documentation:

http://apidock.com/rails/ActiveSupport/CoreExtensions/Module/alias_method_chain

"Encapsulates the common pattern of:

  alias_method :foo_without_feature, :foo
  alias_method :foo, :foo_with_feature"

I'd prefer to have an official non-hacking way of achieving the same with just Ruby. Something simpler like:

class A
  def a
    2
  end
end

class A
  def a
    super! * 3
  end
end

A.new.a == 6

This way we wouldn't need to polute A with a_with_feature and a_without_feature methods if we're not interested on them.


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