[Django]-Default User Model OneToOneField Attribute Error

You’ve used the class name as an attribute, so I think you’ll find it really helpful to set the related_name param on fields like this.

For example;

class User_Info(models.Model):
    user = models.OneToOneField(User, null=True, related_name='info', on_delete = models.CASCADE)

You can then access that in a view by doing;

def userPage(request):
    user = request.user
    user_info = user.info
    
    context = {
        "user" : user,
        "user_info" : user_info,
    }
    return render(request, "accounts/user.html", context)

You can read the docs on related_name here; https://docs.djangoproject.com/en/3.1/ref/models/fields/#django.db.models.ForeignKey.related_name

The default name of the relation in reverse is the name of the class with lowercase, so you access it with user_info:

def userPage(request):
    info = user.user_info
    trades = info.trade_set.all()
    total_trades = trades.count()
    context = {'_user_' : info, 'trades' : trades, 'total_trades' : total_trades}
return render(request, "accounts/user.html", context)

Or you can set the related_name=… parameter [Django-doc] in the OneToOneField to specify the name of the relation in reverse.

here are a few things I’d suggest. The code you have listed is trying to connect two classes together, not instances. So I would put a related_name='user_info' on your User_Info class, then you can call something like user.user_info.

I strongly recommend not using underscores in class names.

Also, allowing null = True for the relationship to User on a user annotation class seems very weird to me. User not having a User_Info instance is ok. User-Info instance without a User makes no sense to me.