1. from django.contrib.auth.models import User
    
  2. from django.db import models
    
  3. 
    
  4. 
    
  5. # Regression for #13368. This is an example of a model
    
  6. # that imports a class that has an abstract base class.
    
  7. class UserProfile(models.Model):
    
  8.     user = models.OneToOneField(User, models.CASCADE, primary_key=True)