Proyecto Django_googleapi_project: Error de atributo en /perfil. Valor de excepción: El objeto ‘User’ no tiene el atributo ‘userprofile’.

He estado siguiendo este video para aprender Django: https://www.youtube.com/watch?v=_vCT42vDfgw.

He seguido hasta el final, he ejecutado el servidor en localhost en el puerto 8000. Puedo registrar usuarios, pero cuando intento actualizar el perfil de un usuario (haciendo clic en el enlace 'Update User Profile' en la vista), obtengo un AttributeError en/profile, que no he podido resolver a pesar de verificar el código fuente del tutor (todo parece igual) y buscar respuestas a preguntas similares en stack overflow aquí.

Cualquier ayuda sería muy apreciada…

Aquí está la prueba de error:

Environment:

Request Method: GET
Request URL: http://localhost:8000/profile

Django Version: 3.2.9
Python Version: 3.10.0
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'main',
 'users']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware']

Traceback (most recent call last):
  File "C:\Users\Toshiba\Envs\django-googleapi-project\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
    response = get_response(request)
  File "C:\Users\Toshiba\Envs\django-googleapi-project\lib\site-packages\django\core\handlers\base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "c:\django-googleapi-project\users\views.py", line 48, in profile_view
    up = user.userprofile
AttributeError: 'User' object has no attribute 'userprofile'

Aquí está la muestra de código en el archivo users\views.py que contiene el objeto userprofile:

from django.shortcuts import render, redirect, reverse
from django.contrib.auth.decorators import login_required
from django.contrib.auth.models import User
from django.contrib.auth import login, logout, authenticate
from django.conf import settings
from django.http import JsonResponse
from django.views.generic.edit import FormView
from django.views.generic.base import TemplateView
from django.utils.decorators import method_decorator

from django-googleapi-project.mixins import (
    AjaxFormMixin, 
    reCAPTCHAValidation,
    FormErrors,
    RedirectParams,
)

from .forms import (
    UserForm,
    UserProfileForm,
    AuthForm,
)

result = "Error"
message = "There was an error, please try again"

class AccountView(TemplateView):
    '''
    Generic FormView with our mixin to display user account page
    '''
    template_name = "users/account.html"

    @method_decorator(login_required)
    def dispatch(self, *args, **kwargs):
        return super().dispatch(*args, **kwargs)


@login_required
def profile_view(request):
    '''
    function view to allow users to update their profile
    '''
    user = request.user
    up = user.userprofile

    form = UserProfileForm(instance = up) 

    if request.is_ajax():
        form = UserProfileForm(data = request.POST, instance = up)
        if form.is_valid():
            obj = form.save()
            obj.has_profile = True
            obj.save()
            result = "Success"
            message = "Your profile has been updated"
        else:
            message = FormErrors(form)
        data = {'result': result, 'message': message}
        return JsonResponse(data)

    else:

        context = {'form': form}
        context['google_api_key'] = settings.GOOGLE_API_KEY
        context['base_country'] = settings.BASE_COUNTRY

        return render(request, 'users/profile.html', context)


class SignUpView(AjaxFormMixin, FormView):
    '''
    Generic FormView with our mixin for user sign-up with reCAPTURE security
    '''
    template_name = "users/sign_up.html"
    form_class = UserForm
    success_url = "/"

    #reCAPTURE key required in context
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["recaptcha_site_key"] = settings.RECAPTCHA_PUBLIC_KEY
        return context

    #over write the mixin logic to get, check and save reCAPTURE score
    def form_valid(self, form):
        response = super(AjaxFormMixin, self).form_valid(form)  
        if self.request.is_ajax():
            token = form.cleaned_data.get('token')
            captcha = reCAPTCHAValidation(token)
            if captcha["success"]:
                obj = form.save()
                obj.email = obj.username
                obj.save()
                up = obj.userprofile
                up.captcha_score = float(captcha["score"])
                up.save()

                login(self.request, obj, backend='django.contrib.auth.backends.ModelBackend')

                #change result & message on success
                result = "Success"
                message = "Thank you for signing up"


            data = {'result': result, 'message': message}
            return JsonResponse(data)

        return response


class SignInView(AjaxFormMixin, FormView):
    '''
    Generic FormView with our mixin for user sign-in
    '''
    template_name = "users/sign_in.html"
    form_class = AuthForm
    success_url = "/"

    def form_valid(self, form):
        response = super(AjaxFormMixin, self).form_valid(form)  
        if self.request.is_ajax():
            username = form.cleaned_data.get('username')
            password = form.cleaned_data.get('password')
            #attempt to authenticate user
            user = authenticate(self.request, username=username, password=password)
            if user is not None:
                login(self.request, user, backend='django.contrib.auth.backends.ModelBackend')
                result = "Success"
                message = 'You are now logged in'
            else:
                message = FormErrors(form)
            data = {'result': result, 'message': message}
            return JsonResponse(data)
        return response


def sign_out(request):
    '''
    Basic view for user sign out
    '''
    logout(request)
    return redirect(reverse('users:sign-in'))

Aquí está el archivo users.models; tengo una clase UserProfile. He intentado cambiar esto a userprofile, pero el error persiste. ¿Tal vez no he hecho las importaciones correctas?

“`
from django.db import models
from django.contrib.auth.models import User

class UserProfile(models.Model):
”’
Our UserProfile model extends the built-in Django User Model
”’
timestamp = models.DateTimeField(auto_now_add = True)
updated = models.DateTimeField(auto_now = True)
user = models.OneToOneField(User, related_name=’profile’, on_delete = models.CASCADE)

address = models.CharField(verbose_name = "Address", max_length=100, null=True, blank=True)
town = models.CharField(verbose_name = "Town/City", max_length=100, null=True, blank=True)
county = models.CharField(verbose_name = "County", max_length=100, null=True, blank=True)
post_code = models.CharField(verbose_name = "Post Code", max_length=8, null=True, blank=True)
country = models.CharField(verbose_name = "Country", max_length=100, null=True, blank=True)
longitude = models.CharField(verbose_name = "Longitude",