From: Thomas Sawyer <redmine@...>
Date: 2009-02-04T11:37:24+09:00
Subject: [ruby-core:21822] [Feature #1102] Prepend Module

Feature #1102: Prepend Module
http://redmine.ruby-lang.org/issues/show/1102

Author: Thomas Sawyer
Status: Open, Priority: Normal
Category: core, Target version: 1.9.x

Currently when a module is included into a classes, it is appended to the class hierarchy (ie. the method lookup order). This of course makes sense, but there are times when it would be useful to *prepend* the module. For example:

  class C
    def x; "x"; end
  end

  module M
    def x; '[' + super + ']'; end
  end

  class C
    prepend M
  end

  C.new.x  #=> "[x]"

One big advantage of this is being able to override methods in a safer way, rather than using alias or tricks like alias_method_chain.


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