保留从Ruby中的文件加载YAML的密钥顺序

require 'yaml'

configuration = nil
File.open('configuration.yaml','r') do |file|
  configuration = YAML::load(file)
  # at this point configuration is a hash with keys in an undefined order
end

# process configuration in some way

File.open('output.yaml','w+') do |file|
  YAML::dump(configuration,file)
end

如果你因为任何原因(比如我)而使用1.8.7,我已经使用了active_support / ordered_hash.我知道activesupport似乎是一个很大的包含,但是他们在以后的版本中重构了它,你几乎只需要文件中需要的部分,其余部分被遗漏.只需宝石安装activesupport,并将其包含如下所示.此外,在您的YAML文件中,请务必使用!! omap声明(以及哈希数组).示例时间！

# config.yml #

months: !!omap
  - january: enero
  - february: febrero
  - march: marzo
  - april: abril
  - may: mayo

这是它背后的Ruby的样子.

# loader.rb #

require 'yaml'
require 'active_support/ordered_hash'

# Load up the file into a Hash
config = File.open('config.yml','r') { |f| YAML::load f }

# So long as you specified an !!omap,this is actually a
# YAML::PrivateClass,an array of Hashes
puts config['months'].class

# Parse through its value attribute,stick results in an OrderedHash,# and reassign it to our hash
ordered = ActiveSupport::OrderedHash.new
config['months'].value.each { |m| ordered[m.keys.first] = m.values.first }
config['months'] = ordered

我正在寻找一种解决方案,允许我递归地挖掘从.yml文件加载的Hash,查找那些YAML :: PrivateClass对象,并将它们转换为ActiveSupport :: OrderedHash.我可以发一个问题.