Django Model - User Profile

1from django.db import models
2from django.contrib.auth.models import User
3 
4class Profile(models.Model):
5    user = models.OneToOneField(User, on_delete=models.CASCADE)
6    bio = models.TextField(max_length=500, blank=True)
7    location = models.CharField(max_length=30, blank=True)
8    birth_date = models.DateField(null=True, blank=True)
9 
10    def __str__(self):
11        return self.user.username