From: Ralph Shnelvar <ralphs@...32.com>
Date: 2010-02-04T11:38:58+09:00
Subject: hooking subscript operations in a hash

In order to help debug something, I'd like to hook the hash subscript operation.

I've tried this (and several variants) in irb ... but it doesn't do what I want it to.


module RalphMod
  def []=(index, value)
    p index
    p value
    if index == 'PATH_INFO' and value == '/undefined'
      puts 'found it!'
    end
    super index, value
  end
end

class Hash
  extend RalphMod
end

env = {}
env['X'] = 'Y'
env['PATH_INFO'] = '/undefined'


The values are not displayed and 'found it!' is also not displayed.