From: dblack@...
Date: 2006-11-27T07:22:53+09:00
Subject: Re: REXML and Date interaction

Hi --

On Mon, 27 Nov 2006, Robert Evans wrote:

> Hi,
>
> Thanks for running it, indeed that broken version works, and I must've 
> corrupted my irb session. So, I tried it again and discovered more precisely 
> the problem. If I include REXML in the class instead of explicitly specifying 
> REXML::Document, then I get the problem. Which, I can just "not do that" for 
> now, but it is still curious what is happening. Here is a version that seems 
> to produce the error still.
>
> Thanks for the sanity check,
>
> Bob Evans
>
>
>
> Better Broken
> =============
> #!/usr/bin/env ruby
>
> require 'rexml/document'
> require 'date'
>
> class DateFun
> ## BEGIN Different
> include REXML
> ## END Different
>
> def parse(xml)
> ## BEGIN Different
>   doc = Document.new(xml)
> ##End Different
>
>   elems = doc.root.get_elements('//body/dateelement[@date]')
>   elems.map { |s|
>     s.attributes["date"].to_s
>   }.sort
> end
>
> def sorted_dates_from(xml)
>   sorted_dates = parse(xml)
>   sorted_dates.map { |d| Date.parse(d)}.sort

What's happening is that you're bringing REXML::Date into scope.  You
need to do:

    ::Date.parse

to get the top-level Date constant.


David

-- 
                   David A. Black | dblack@wobblini.net
Author of "Ruby for Rails"   [1] | Ruby/Rails training & consultancy [3]
DABlog (DAB's Weblog)        [2] | Co-director, Ruby Central, Inc.   [4]
[1] http://www.manning.com/black | [3] http://www.rubypowerandlight.com
[2] http://dablog.rubypal.com    | [4] http://www.rubycentral.org