Django form creating new record instead of updating - django

Question

I'm creating a user update form in my app. but every time when the form is submitted , it creates a new record and if you try submitting again will return Integrity Error(duplicate username that both are null).
ERROR message: django.db.utils.IntegrityError: UNIQUE constraint failed: auth_user.username
forms.py:
class UserChangeForm(forms.ModelForm):
class Meta:
model = User
fields = ['email', 'first_name', 'last_name']
def __init__(self, username, *args, **kwargs):
super(UserChangeForm, self).__init__(*args, **kwargs)
self.username = username
views.py:
def profile(request):
user = request.user
if request.method == 'POST':
user_form = UserChangeForm(user, request.POST)
if user_form.is_valid():
user_form.save()
messages.success(request, f'Your account has been updated!')
return redirect('users:profile')
else:
email = request.user.email
first_name = request.user.first_name
last_name = request.user.last_name
user_form = UserChangeForm(user, initial={
'email': email,
'first_name': first_name,
'last_name': last_name
})
context = {
'user_form': user_form,
}
return render(request, 'users/profile.html', context)

Answer 1

you need to pass the user as instance in the if condition and in else too like this
def profile(request):
if request.method == 'POST':
user_form = UserChangeForm(request.POST , instance = request.user)
if user_form.is_valid():
user_form.save()
messages.success(request, f'Your account has been updated!')
return redirect('users:profile')
else:
user_form = UserChangeForm(instance=request.user)
context = {
'user_form': user_form,
}
return render(request, 'users/profile.html', context)