Django Model Unique

class Follow(BaseModel):
    """팔로우"""
    from_user = models.ForeignKey(User, related_name='from_user', on_delete=models.CASCADE)
    to_user = models.ForeignKey(User, related_name='to_user', on_delete=models.CASCADE)
 
    class Meta:
        unique_together = ('from_user', 'to_user')