'Update a speaker given its id'

@requires_auth
@replace_event_id
@can_update(DAO)
@api.doc('update_speaker', responses=PUT_RESPONSES, model=SPEAKER)
@speakers_marshal_with()
@api.expect(SPEAKER_POST)
def put(self, event_id, speaker_id):

    return DAO.update(event_id, speaker_id, self.api.payload)
