From: "Martin Müller" <usenet@...>
Date: 2007-02-04T01:15:06+09:00
Subject: Saving class with array property with YAML

Hello

I'm new to Ruby and unfortuantly I can't find an example anywhere to the 
following problem.

I have the following class:


class Article
   attr_accessor :author
   attr_accessor :title

   def inititialize(author, title)
     @autor = author
     @title = title
   end
end


class Book
   attr_accessor :year
   attr_accessor :volume
   attr_accessor :articles       # array of articles

   def initialize(year, volume)
     @year     = year
     @volume   = volume
     @articles = Array.new
   end

   def insert(author, title)
     @articles.push(Article.new(author,title))
   end
end


class Bookshelf
...
end


#create book
testbook = Book.new(2007, 1)

#insert 2 articles into the book
testbook.insert("Martin Mueller", "Confessing that I'm a Ruby Dummy")
testbook.insert("Hillary Clinton", "Elect me and Ruby will save our planet")


#write Book to YAML
File.open("testbook.yaml", "w") {|f| YAML.dump(testbook, f)}

-----------------------

My question is: how can I bring Ruby to save also the Array??

I played around with  to_yaml_properties but without success.

thanks a lot for any hint!

Best regards,
Martin.