docs: def id_from_url(url, param_name: str) -> int:
      """
      Parses an object and tries to extract a url.
      Tries to parse if a resource_url has been given
      it as a url.
      :raise ValueError: If no id could be extracted.
      """
      if url is None:
          raise ValueError('url is none')
      elif isinstance(url, int):
          # Seems to already be the url.
          return url
      if not url:
          raise ValueError('Seems to be empty')
  
      try:
          return int(url)
      except ValueError:
          pass
  
      parsed = urlparse(url)
      try:
          resource_url = app.url_map.bind(parsed.netloc).match(
              parsed.path
          )
      except NotFound:
          raise ValueError('No URL found')
  
      if param_name in resource_url[1]:
          return resource_url[1][param_name]
      else:
          raise ValueError(
              'Parameter {name} could not be extracted'.format(
                  name=param_name
              )
          )