sorted_yaml_hash.rb

gistfile1.rb

# Based on http://snippets.dzone.com/posts/show/5811
#
# Differences over snippet above:
# * will sort hashes with keys that are symbols
# * different usage style (see below)

require 'yaml'

module SortedYamlHash

  def to_yaml(opts = {})
    YAML::quick_emit(object_id, opts) do |out|
      out.map(taguri, to_yaml_style) do |map|
        self.sort { |a, b| a.to_s <=> b.to_s }.each do |k, v|
          v.extend(SortedYamlHash) if v.is_a?(Hash)
          map.add(k, v)
        end
      end
    end
  end

end

h = {
  :a => {
    'dog'   => 2,
    'zebra' => 4,
    'camel' => 10,
  },
  :b => {
    :z => 'z',
    :y => 'y',
    :x => 'x',
  }
}.extend(SortedYaml)
y h