recursive merge of Hash

gistfile1.rb

class Hash
  def rmerge(other)
    new_hash = {}
    keys = (self.keys + other.keys).uniq
    
    keys.each do |k|
      if other.key?(k)
        if self.key?(k) && self[k].kind_of?(Hash)
          new_hash[k] = self[k].rmerge(other[k])
        else
          new_hash[k] = other[k]
        end
      else
        new_hash[k] = self[k]
      end
    end
    
    new_hash
  end
end


require 'yaml'

org_str = <<-EOS
en: 
  activerecord:
    models:
      metadata: "Metadata"
    attributes:
      metadata:
        application_base_id: "ID Based on Application Form"
        entity_id: "entityID"
        certification: "Certificate"
        status: "Status"
EOS

new_str = <<-EOS
en:
  activerecord:
    attributes:
      metadata:
        contact_person_name: "Name (English)"
        contact_person_mail: "E-mail Address"
EOS

org_yaml = YAML.load(org_str)
new_yaml = YAML.load(new_str)
merged_yaml = org_yaml.rmerge(new_yaml)
puts YAML.dump(merged_yaml)