class Comment(models.Model):
    post = models.ForeignKey(Post, 
        on_delete=models.CASCADE, related_name='comments')
    owner = models.ForeignKey(
        Profile, null=True, blank=True, on_delete=models.CASCADE)
    text = models.TextField()
    published = models.DateTimeField(auto_now_add=True)
    approved = models.BooleanField(default=False)
    
    class Meta:
        ordering = ['-published']
        verbose_name = 'Комментарий'
        verbose_name_plural = 'Комментарии'

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

    def __str__(self):
        return self.text

Оставить комментарий