Re: Creating variable inside a class

On Aug 5, 2013, at 3:35 PM, Renato Co <[e-mail]> wrote:

> All I want to do, is to create a new variable called data_dfp inside the
> class, and be able to set/get it's value from outside
> 
> require 'nokogiri'
> class MyDocument < Nokogiri::XML::SAX::Document

When you did this, you created a new class that inherits from Nokogiri::XML::SAX::Document

>  attr_accessor :data_dfp
> 
>  def start_element(name, attrs = [])
>    puts "#{name}"
>  end
> end
> 
> parser = Nokogiri::XML::SAX::Parser.new(MyDocument.new)

But then you assigned parser to a new Nokogiri::XML::SAX::Parser object. The MyDocument.new will get eaten up by the enclosing .new. Since you defined the instance variable and setters/getters in the inherited class, they will not be in the Nokogiri::XML::SAX::Parser class, and thus not in the instance.

If instead you make parser an instance of MyDocument, you'd get them:

parser = MyDocument.new


> parser.data_dfp = 4
> puts parser.data_dfp
> 
> Error
> nokoteste.rb:12:in `<main>': undefined method `data_dfp=' for
> #<Nokogiri::XML::SAX::Parser:0x007fcc1413bea0> (NoMethodError)
> 
> 
> Whats the right way of doing this?
> 
> -- 
> Posted via http://www.ruby-forum.com/.
> 

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