DJANGO中正规的建立与USER外键的方式

from django.db import models
from django.conf import settings

class Profile(models.Model):
    user = models.OneToOneField(settings.AUTH_USER_MODEL)
    date_of_birth = models.DateField(blank=True, null=True)
    photo = models.ImageField(upload_to='users/%Y/%m/%d',
                blank=True)

    def __str__(self):
    return 'Profile for user {}'.format(self.user.username)