From: "shyouhei (Shyouhei Urabe)" <shyouhei@...>
Date: 2012-07-09T22:40:27+09:00
Subject: [ruby-core:46270] [ruby-trunk - Feature #6712] Introduce super! for calling old definition when reopening classes


Issue #6712 has been updated by shyouhei (Shyouhei Urabe).


(1) I don't like the name
(2) It's not obvious what'd happen.  What if A includes other module, which also define a method? alias_method_chain is clear about it because alias_method_chain is evaluated at the time of class loading. Your synatx delays it to actuall calling of the method.
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Feature #6712: Introduce super! for calling old definition when reopening classes
https://bugs.ruby-lang.org/issues/6712#change-27892

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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