UNIQUE constraint failed: accounts_user.username - django

Question

Let's get to the problem
I have a page where I want users to fill info about themselves, and i would like to save that data. But I'm getting this error.
IntegrityError at /accounts/profile/edit/1/change-profile/
UNIQUE constraint failed: accounts_user.username
this is my view.py
def change_profile(request, pk):
form = ChangeProfile(request.POST or None)
user_ = request.user
if request.method == "POST":
if form.is_valid():
form.save()
return redirect("/accounts/profile/edit/{}/".format(user_.pk))
args = {'form': form}
return render(request, 'change_profile.html', args)
my models.py
class GradeUser(models.Model):
grade = models.CharField(max_length=20, null=True)
class Country(models.Model):
country = models.CharField(max_length=30, null=True)
class User(AbstractBaseUser):
email = models.EmailField(
verbose_name = 'email address',
max_length=255,
unique=True
)
real_name = models.CharField(max_length=20, blank=True)
username = models.CharField(max_length=40, unique=True, verbose_name='username')
grade = models.ForeignKey(GradeUser, on_delete=models.CASCADE, blank=True, null=True)
country = models.ForeignKey(Country, on_delete=models.CASCADE, blank=True, null=True)
reputation = models.IntegerField(default=0)
image = models.ImageField(upload_to='accounts/media', blank=True)
about_me = models.TextField()
USERNAME_FIELD= 'email'
REQUIRED_FIELDS = ['username']
objects = UserManager()
forms.py
class ChangeProfile(forms.ModelForm):
class Meta:
model = User
fields = ('real_name', 'grade', 'country', 'about_me')
What does exactly go wrong?
Why would it need a user's username?
What should I do with it to save?

Answer 1

You aim to perform an update on your User (that already exists) but here you are creating a whole new user instance with no username attribute and that's what generates the error.
Try this code : it gets your current user and updates it with the info provided from the form.
PS : I did not modify anything about the returns because I dunno what you're doing there but note that you don't need to pass the user pk through the arguments, the user data is already stored in the request object.
def change_profile(request, pk):
form = ChangeProfile()
user_ = request.user
if request.method == "POST":
form = ChangeProfile(request.POST)
if form.is_valid():
user_new_info=form.save(commit=false)
user_.real_name = user_new_info.real_name
user_.grade = user_new_info.grade
user_.country = user_new_info.country
user_.about_me = user_new_info.about_me
user_.save()
return redirect("/accounts/profile/edit/{}/".format(user_.pk))
args = {'form': form}
return render(request, 'change_profile.html', args)