在Ruby中将嵌套哈希转换成点分隔字符串的单线程？

def to_dotted_hash(source,target = {},namespace = nil)
  prefix = "#{namespace}." if namespace
  case source
  when Hash
    source.each do |key,value|
      to_dotted_hash(value,target,"#{prefix}#{key}")
    end
  when Array
    source.each_with_index do |value,index|
      to_dotted_hash(value,"#{prefix}#{index}")
    end
  else
    target[namespace] = source
  end
  target
end

require 'pp'
require 'yaml'

data = YAML.load(DATA)
pp data
pp to_dotted_hash(data)

__END__
root:
  child_a: Hello
  child_b:
    nested_child_a: Nesting
    nested_child_b: Nesting Again
  child_c: K

版画

{"root"=>
      {"child_a"=>"Hello","child_b"=>{"nested_child_a"=>"Nesting","nested_child_b"=>"Nesting Again"},"child_c"=>"K"}}
    {"root.child_c"=>"K","root.child_b.nested_child_a"=>"Nesting","root.child_b.nested_child_b"=>"Nesting Again","root.child_a"=>"Hello"}