From: Jose francisco Gonzalez carmona <pgonzalez@...>
Date: 2007-11-29T03:22:40+09:00
Subject: Re: REXML inheritance confusion (simple q?)

Casimir wrote:
> So I created my own subclass of REXML::Document. Like this:
> 
> #begin example
> class MyDoc < REXML::Document
>    def initialize ()
>      @tree = super("<docc></docc>")
>      puts @tree.class
>      @name = tree.root.add_element("test")
> end
> #end example
> 
> The above results in "undefined method `root' for nil:NilClass
> (NoMethodError)"
> 
> Also trying 'super.new("<docc></docc>")' doesnt work.
> 
> I can get it working by writing @tree =
> REXML::Document("<docc></docc>"), but then my nice class will only be a
> container, not a subclass.
> 
> How can I actually get it working? Ie. get my very own  subclass of
> REXML::Document with my very own initialize.
> 
> Yes, its a foggy day and inheritance seems to escape me...
> 
> Csmr
try this:

-----BEGIN PROGRAM-----
require 'rexml/document'

xml =<<END_DOC
  <docc></docc>
END_DOC

class MyDoc < REXML::Document
   def initialize (fnm)
    super(fnm)
     puts "from initialize: #{self.class}"
     @name = self.root.add_element("test")
 end
end

m_doc = MyDoc.new(xml)
puts m_doc.root
-----END PROGRAM-----

-- 
Posted via http://www.ruby-forum.com/.