code: def save(self, *args, **kwargs):
          
          self.uid = '{}_{}_ballotmeasure:{}'.format(
              self.division.uid,
              self.election_day.uid,
              self.number
          )
          super(BallotMeasure, self).save(*args, **kwargs)
docs: **uid**: :code:`division_cycle_ballotmeasure:{number}`