Как сделать переключение сортировки списка?

class Comment(models.Model):
	post = models.ForeignKey(Post, related_name='comments', on_delete=models.CASCADE)
	author = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE,)
	content = models.TextField()
	date_add = models.DateTimeField(default=timezone.now)
	approved_comment = models.BooleanField(default=False)

	def approve(self):
		self.approved_comment = True
		self.save()

	def get_absolute_url(self):
		return reverse('post', kwargs={'pk': self.pk})

	def __str__(self):
		return self.content

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