OneToOne Relationship Example

# models.py

from django.db import models

class User(models.Model):
    username = models.CharField(max_length=100)

    def __str__(self):
        return self.username

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE, related_name='profile')
    bio = models.TextField(blank=True)
    avatar = models.ImageField(upload_to='avatars/', blank=True, null=True)

    def __str__(self):
        return f"Profile of {self.user.username}"
  

# Django Shell

>>> from accounts.models import User, Profile
>>> user = User.objects.create(username='john_doe')
>>> profile = Profile.objects.create(user=user, bio='Django Developer')
>>> profile.user.username
'john_doe'
>>> user.profile.bio
'Django Developer'