**uid**: :code:`division_cycle_ballotmeasure:{number}`

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