recursive different search from two version of transration_??.yml.

Hash#rdiff.rb

class Hash
  def rdiff(other)
    new_hash = {}
    self.each do |key, value|
      if other.key?(key)
        if value.kind_of?(Hash)
          if other[key].kind_of?(Hash)
            diff = value.rdiff(other[key])
            unless diff.empty?
              new_hash[key] = diff
            end
          else
            new_hash[key] = value
          end
        else
          unless value == other[key]
            new_hash[key] = value
          end
        end
      else
        new_hash[key] = value
      end
    end
    
    new_hash
  end
end

require 'yaml'

current_str = <<-EOS
en:
  activerecord:
    models:
      metadata: "Metadata"
      attributes:
    metadata:
      application_base_id: "ID Based on Application Form"
      entity_id: "entityID"
      certification: "Certificate"
      status: "Status"
  foo: "bar"
EOS
 
old_str = <<-EOS
en:
  activerecord:
    models:
      metadata: "Metadata"
      attributes:
    metadata:
      entity_id: "EntityID"
      certification: "Certificate"
      status: "Status"
EOS
 
current_yaml = YAML.load(current_str)
old_yaml = YAML.load(old_str)
appended_yaml = current_yaml.rdiff(old_yaml)
puts YAML.dump(appended_yaml)
# ---
# en:
#   activerecord:
#     metadata:
#       entity_id: entityID
#       application_base_id: ID Based on Application Form
#   foo: bar