From: Jason Creighton <androflux@...>
Date: 2003-09-18T08:52:04+09:00
Subject: Re: [newbie]saving and reading array of associative array

On Wed, 17 Sep 2003 21:22:13 +0900
Joey Gibson <joey@joeygibson.com> wrote:

> On 9/17/2003 6:34 AM, gabriele renzi wrote:
> 
> >Marshal::dump
> >     dump( anObject [, anIO] , limit=--1 ) -> anIO
> >
> >BTW you could even use PStore, included in the standard lib, it works
> >similar to an hash, but gets saved on disk and supports 'transactions'
> >for data integrity.
> >  
> >
> 
> You could also use YAML:
> 
> require 'yaml'
> one = {"Name" => "Smith", "Surname" => "John"}
> two = {"Name" => "Dupont", "Surname" => "Jean"}
> 
> myFriends = [one, two]
> 
> File.open("myfriends.db", "w") {|file| file.write(myFriends.to_yaml)}
> myFriends = File.open("myfriends.db") {|file| YAML.load(file)}

Yes, I was just about to mention YAML. Also note that you can use
YAML::Store as a drop-in PStore replacement. (In fact, this example is
the example given in pstore.rb, I just require'd yaml/store, and changed
the db = line to YAML::Store)

~/prog/ruby$ cat yaml-store-example.rb 
require 'yaml/store'
db = YAML::Store.new("/tmp/foo")
db.transaction do
  p db.roots
  ary = db["root"] = [1,2,3,4]
  ary[0] = [1,1.5]
end

db.transaction do
  p db["root"]
end
~/prog/ruby$ ruby yaml-store-example.rb 
[]
[[1, 1.5], 2, 3, 4]
~/prog/ruby$ cat /tmp/foo
--- 
root: 
  - 
    - 1
    - 1.5
  - 2
  - 3
  - 4
~/prog/ruby$ 

Jason Creighton