**uid**: :code:`{cycle.uid}_date:{date}`

def save(self, *args, **kwargs):
        """
        **uid**: :code:`{cycle.uid}_date:{date}`
        """
        self.uid = '{}_date:{}'.format(
            self.cycle.uid,
            self.date
        )
        self.slug = '{}'.format(self.date)
        super(ElectionDay, self).save(*args, **kwargs)