Extending user model is causing an HTTP 400 error - django

Question

I followed the Django documentation to try to extend my user model to add a field called authentication_key. It is resulting in an HTTP 400 error when I test the site locally.
My models:
class AuthenticationKey(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE)
authentication_key = models.CharField(max_length=100)
My Admin:
class AuthenticationKeyInline(admin.StackedInline):
model = AuthenticationKey
can_delete = False
verbose_name_plural = 'AuthenticationKey'
# Defines a new User admin
class UserAdmin(BaseUserAdmin):
inlines = (AuthenticationKeyInline, )
# Re-register UserAdmin
admin.site.unregister(User)
admin.site.register(User, UserAdmin)
And how I'm referring to the field in my views.py
#login_required(login_url='/login/')
def home_page(request):
u_id = request.user.authenticationkey
url = "http://example.com/api/allrequests/?format=json"
response = urlopen(url)
data = response.read().decode("utf-8")
j_data = json.loads(data)
j_data = json.dumps(j_data)
url = "http://example.com/api/past24hrdialoguebyid/" + str(u_id) + "/?format=json"
response = urlopen(url)
m_data = response.read().decode("utf-8")
return render(request,'index.html',{"u_id":u_id,"j_data":str(data),"m_data":str(m_data)});
I'm thinking the error may be how I'm referring to the field in views but I can't figure out quite what's wrong.
Here are my URL Patters:
urlpatterns = [
path('admin/', admin.site.urls),
path('home/', home_page),
path('public/', public),
path('room-queue/', room_queue),
path('all-requests/', all_requests),
path('add-data/', add_data),
path('room-api/', room_api),
path('delete-data/', delete_data),
path('login/', auth_views.LoginView.as_view(template_name='admin/login.html')),
path('index-add-guest/', add_guest),
path('send-reply/', send_reply),
path('room-ready/', room_ready),
]

Answer 1

request.user.authenticationkey does not exist, since you have not defined authenticationkey as a property of the User model.
As already defined in your code, you should access the authentication key this way:
from .models import AuthenticationKey
authkey = AuthenticationKey.objects.get(user=request.user)
u_id = authkey.authentication_key
if you want to access authenticationkey as a property of user then you have to extend the User model by subclassing AbstractUser or AbstractBaseUser.
For instance, in your models.py
from django.contrib.auth.models import AbstractUser
class User(AbstractUser):
authenticationkey = models.CharField(max_length=100)
In settings.py file, update the AUTH_USER_MODEL
AUTH_USER_MODEL = 'appname.models.User'
make sure you apply the migrations. You should then be able to access
request.user.authenticationkey
remember to update your admin too
from django.contrib import admin
from django.contrib.auth.admin import UserAdmin
from .models import User
admin.site.register(User, UserAdmin)