What's the recommended way to type OneToOne fields?

[rvanlaar]

We have a user model and different types of users. Very simplified, we have users, and some users can have API access. Then there's a OneToOne from an APIUser model to the User model.

class User(AbstractUser):
    pass
    
class APIUser:
    user = models.OneToOneField(
        settings.AUTH_USER_MODEL, on_delete=models.CASCADE, primary_key=True
    )
    api_key = models.CharField()

When a User is an APIUser I can use user.apiuser. Which has a type of APIUser.
However when it's the User is not an APIUser then Django will raise RelatedObjectDoesNotExist when trying to access apiuser.

What's the recommended way to type hint this on the User model?

[sbdchd]

does APIUser inherit from User?

trying to figure out how they connect -- usually a generic somewhere can help

[rvanlaar]

As shown in the short example code, APIUser doesn't inherit.