What caused this exception?

Question

Django

I did everything according to this guide: https://habrahabr.ru/post/313764/#OneToOneField
However, in the end we get an exception:

spoiler

RelatedObjectDoesNotExist at /profiles/
User has no profile.
Request Method:	GET
Request URL:	http://localhost:8000/profiles/
Django Version:	2.0.1
Exception Type:	RelatedObjectDoesNotExist
Exception Value:	
User has no profile.
Exception Location:	C:\Phyton\lib\site-packages\django\db\models\fields\related_descriptors.py in __get__, line 389
Python Executable:	C:\Phyton\python.exe
Python Version:	3.6.4
Python Path:	
['E:\\work\\life',
 'C:\\Phyton\\python36.zip',
 'C:\\Phyton\\DLLs',
 'C:\\Phyton\\lib',
 'C:\\Phyton',
 'C:\\Phyton\\lib\\site-packages']
Server time:	Вт, 10 Апр 2018 16:13:01 +0000

views.py

from django.shortcuts import render
from django.contrib.auth.decorators import login_required
from django.db import transaction
from django import forms
from .forms import UserForm
from .forms import ProfileForm
from .models import Profile
from django.contrib.auth.models import User
@login_required
@transaction.atomic
def update_profile(request):
    if request.method == 'POST':
        user_form = UserForm(request.POST, instance=request.user)
        profile_form = ProfileForm(request.POST, instance=request.user.profile)
        if user_form.is_valid() and profile_form.is_valid():
            user_form.save()
            profile_form.save()
            messages.success(request, _('Your profile was successfully updated!'))
            return redirect('settings:profile')
        else:
            messages.error(request, _('Please correct the error below.'))
    else:
       	user_form = UserForm(instance=request.user)
        profile_form = ProfileForm(instance=request.user.profile)
    return render(request, 'profiles/profile.html', {
        'user_form': user_form,
        'profile_form': profile_form
    })

models.py

from django.db import models
from django.contrib.auth.models import User
from django.db.models.signals import post_save
from django.dispatch import receiver

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    bio = models.TextField(max_length=500, blank=True)
    location = models.CharField(max_length=30, blank=True)
    birthday = models.DateField(null=True, blank=True)

@receiver(post_save, sender=User)
def create_user_profile(sender, instance, created, **kwargs):
    if created:
        Profile.objects.create(user=instance)

@receiver(post_save, sender=User)
def save_user_profile(sender, instance, **kwargs):
    instance.profile.save()

forms.py

from django.db import models
from django.contrib.auth.models import User
from .models import *
from django import forms
from django import views
class UserForm(forms.ModelForm):
    class Meta:
        model = User
        fields = ('first_name', 'last_name', 'email')

class ProfileForm(forms.ModelForm):
    class Meta:
        model = Profile
        fields = ('bio', 'location', 'birthday')

Answer 1

User.profile = property(lambda u: Profile.objects.get_or_create(user=u)[0])
Solved by adding this line