From: ES <ruby-ml@...>
Date: 2005-06-07T07:21:52+09:00
Subject: Re: newbie read.scan (?) question


Le 6/6/2005, "Bruce D'Arcus" <bdarcus.lists@gmail.com> a �crit:
>Brian Schr�der wrote:
>
>> Anyhow, here is how to define a class variable and class methods.
>>
>> class Klass
>>   @@foo = []
>>
>>   def self.add(bar)
>>     @@foo << bar
>>   end
>>
>>   def self.foo
>>     @@foo
>>   end
>> end
>>
>> Klass.add(1)
>> Klass.add(2)
>> p Klass.foo
>
>OK, am struggling with translating this to my example.  Here's what
>I've done:
>
>    articles.read.scan(article_page).each do |url|
>      article_url = "#{base_url}#{url}"
>      open(article_url) do |article|
>        article_text = article.read
>        title = article_text.scan(title_match).to_s
>        author = article_text.scan(author_match).to_s
>        puts "loading #{title} ...\n"
>        a = Article.new(title, author, article_url)
>        a.add
>      end

add is a class method (see the definition of self.add, which is the
same as saying Article.add), so you would want to call it like

Article.add a    # Need to pass the new article in.

>.... and then:
>
>File.open("articles.yaml", "w") {|f| YAML.dump(p Article.articles, f)}
>
>But I get a "undefined method `add'" error. I have that part of the
>class defined like so:
>
>class Article
>  include Journals
>
>  @@articles = []
>
>  attr_reader :title, :author, :url
>
>  def initialize(title, author, url)
>    @title = title
>    @author = author
>    @url = url
>  end
>
>  def self.add(article)
>    @@articles << article
>  end
>
>  def self.articles
>    @@article
>  end
>
>  ...
>
>> good luck with ruby,
>
>Thanks!
>
>Bruce

E

--
template<typename duck>
void quack(duck& d) { d.quack(); }