Comments on: Jamming with Ruby YAML

By: TechKnow

TechKnow — Tue, 13 Oct 2009 13:50:48 +0000

@Thufir – The problem that you have is because of the YAML file. Your YAML file does not define the nested structure in the example of this page. My example, define on root hash with two elements with keys ‘juixe’ and ‘techknow’, and the values of which was a nested hash. Your YAML file defines one hash with no nested values. Basically the nested structure comes from indentation. The space in front of ‘user’ and ‘pass’ are important to get the nested hash.

By: Thufir

Thufir — Mon, 12 Oct 2009 05:16:59 +0000

Hmm, doesn't quite work for me:

thufir@ARRAKIS:~/projects/rss$ 
thufir@ARRAKIS:~/projects/rss$ ruby user.rb 
user.rb:6: undefined method `[]' for nil:NilClass (NoMethodError)
	from user.rb:5:in `each_key'
	from user.rb:5
thufir@ARRAKIS:~/projects/rss$ 
thufir@ARRAKIS:~/projects/rss$ nl user.rb
     1	require 'yaml'
       
     2	yml = YAML::load(File.open('user.yml'))
       
     3	yml.each_key { |key|
     4	  username = yml[key]['user']
     5	  password = yml[key]['pass']
       
     6	  puts "#{username} => #{password}"
     7	}
thufir@ARRAKIS:~/projects/rss$ 
thufir@ARRAKIS:~/projects/rss$ nl user.yml 
     1	juixe:
     2	user: juixe-user
     3	pass: juixe-pass
       
     4	techknow:
     5	user: techknow-user
     6	pass: techknow-pass
thufir@ARRAKIS:~/projects/rss$

Although, the earlier examples work fine, but the more complex yaml file doesn't seem to get parsed correctly(?).

By: brainopia

brainopia — Fri, 09 Oct 2009 11:28:15 +0000

There is a shortcut for YAML::load(File.open(‘userinfo.yml’)):
YAML.load_file ‘userinfo.yml’

By: janfri

janfri — Fri, 09 Oct 2009 07:43:09 +0000

Please replace require ‘rubygems’ with require ‘yaml’.