class AlgoliaHTMLExtractor

def uuid(item)
  # We first get all the keys of the object, sorted alphabetically...
  ordered_keys = item.keys.sort
  # ...then we build a huge array of "key=value" pairs...
  ordered_array = ordered_keys.map do |key|
    value = item[key]
    # We apply the method recursively on other hashes
    value = uuid(value) if value.is_a?(Hash)
    "#{key}=#{value}"
  end
  # ...then we build a unique md5 hash of it
  Digest::MD5.hexdigest(ordered_array.join(','))
end