def METHOD_NAME(self):
    """
    Refresh the number of comparisons and contributors.
    """
    self.n_comparisons = (
        Comparison.objects.filter(Q(entity_1=self.entity) | Q(entity_2=self.entity))
        .filter(Q(poll=self.poll))
        .count()
    )
    self.n_contributors = (
        Comparison.objects.filter(Q(entity_1=self.entity) | Q(entity_2=self.entity))
        .filter(Q(poll=self.poll))
        .distinct("user")
        .count()
    )
    self.save(update_fields=["n_comparisons", "n_contributors"])