new_contents: @endpoints.method(message_types.VoidMessage, ConferenceForms,
          path='getConferencesCreated',
          http_method='POST', name='getConferencesCreated')
  def getConferencesCreated(self, request):
      """Return conferences created by user."""
      # make sure user is authed
      user = endpoints.get_current_user()
      if not user:
          raise endpoints.UnauthorizedException('Authorization required')
  
      # make profile key
      p_key = ndb.Key(Profile, getUserId(user))
      # create ancestor query for this user
      conferences = Conference.query(ancestor=p_key)
      # get the user profile and display name
      prof = p_key.get()
      displayName = getattr(prof, 'displayName')
      # return set of ConferenceForm objects per Conference
      return ConferenceForms(
          items=[self._copyConferenceToForm(conf, displayName) for conf in conferences]
      )
subject: add TODO 3 to lesson 4 - query conferences created