OneToOne field in a django modelform - django

Question

I have a OneToOne field corresponding to a user (user_id), and in my avatar upload form I get a drop down list of all users to select one, but I want django to fill it with the current logged in user. Also, when submitting the form, for some users I get this message "Profile with this User already exists."
For the first problem I think that inline-formsets are the solution, but I don't know how to apply this to my form. I have no clue about the second problem. I am creating the Profile with a signal every time a new user is created, and I don't know how to just update it. I'm new to django.
Here is the code for my model:
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)
avatar_img = models.ImageField(upload_to='avatars', 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()
The form:
from django import forms
from profiles.models import Profile
class AvatarForm(forms.ModelForm):
class Meta:
model = Profile
fields = ('user', 'avatar_img', )
And the view:
from django.shortcuts import render, redirect
from profiles.forms import AvatarForm
def model_form_upload(request):
if request.method == 'POST':
form = AvatarForm(request.POST, request.FILES)
if form.is_valid():
form.save()
return redirect('index')
else:
form = AvatarForm()
return render(request, 'profiles/avatar_form.html', {
'form': form
})
Thanks.
Update with the solution... I added this to the form:
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.fields['user'].widget.attrs['disabled'] = 'true'
self.fields['user'].widget = HiddenInput()

Answer 1

You can use initial argument for the form. When creating form object in your view you can give an initial argument for your form.
In your view.
This
form = AvatarForm()
can be replaced with
form = AvatarForm(initial={'user': request.user})
This reference should be helpful to you.