Django Updating Existing Model field

Question

I have a model in Django with a foreign key to Django User Model. I am trying to update my model with a form, but database isn't updating. I can't figure out the problem.

model.py

from django.conf import settings

    class UserInfo(models.Model):
        username = models.CharField(max_length = 30)
        owner =  models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE,)

form.py

from django import forms
from society.models import UserInfo

    class Editform(forms.ModelForm):
        username=forms.CharField(widget=forms.TextInput(attrs={'onchange': 'this.form.submit();', 'class': 'editinput'}))
        class Meta:
            model = UserInfo
            fields ='__all__'

views.py

 from django.shortcuts import render
    from society.models import UserInfo
    from django.contrib.auth.models import User
    from society.forms import Editform

        def ProfileView(request):
            user = request.user
            username = UserInfo.objects.get(owner=user)
            if request.method == 'POST':
                form = Editform(request.POST, instance=username)
                if form.is_valid():
                    form.save()
            else:
                form = Editform(instance=username)


            return render (request, 'profile_view.html', {'user':username, 'form':form})

url.py

from django.conf.urls import url
from django.contrib import admin
import society.views

    urlpatterns = [
        url(r'^$', 'society.views.home'),
        url(r'^admin/', admin.site.urls),
        url(r'^login/', 'django.contrib.auth.views.login'),
        url(r'^logout/', 'django.contrib.auth.views.logout'),
        url(r'^userreg/', 'society.views.UserReg'),
        url(r'^profile/', 'society.views.ProfileView'),
    ]

profile_view.html

    <div>
        <form method="POST">
        {% csrf_token %}
            {{form.username}}
            {{user.username}}
        </form>
    </div>

When ever I change form.username, user.username change instantly but the database is not updating. I tried with adding a submit button, but still no luck.

Answer 1

You should pass record id for updating existing UserInfo record.

from django.shortcuts import render
from society.models import UserInfo
from django.contrib.auth.models import User
from society.forms import Editform

def ProfileView(request):
    user_id = request.POST.get('user_id')
    user = UserInfo.objects.get(pk=user_id)
    if request.method == 'POST':
        form = Editform(request.POST, instance=user)
        if form.is_valid():
            form.save()
    else:
        form = Editform(instance=user)

    return render (request, 'profile_view.html', {'user':username, 'form':form})