Using ForeignKey of Django CustomUser giving attribute error - django

Question

Not using Djnago Default user model. Have created a Custom user model named CustomUser
class CustomUser(AbstractBaseUser):
GENDER_CHOICE = (
('MALE', 'MALE'),
('FEMALE', 'FEMALE'),
)
BLOOD_GROUP_CHOICE = (
('A+', 'A+'),
('B+', 'B+'),
('O+', 'O+'),
('AB+', 'AB+'),
('A-', 'A-'),
('B-', 'B-'),
('O-', 'O-'),
('AB-', 'AB-'),
)
RELIGION_CHOICE = (
('ISLAM', 'ISLAM'),
('HINDU', 'HINDU'),
('CHRISTIANITY', 'CHRISTIANITY'),
('OTHER', 'OTHER'),
)
email = models.EmailField(max_length=60, unique=True, verbose_name='Email')
first_name = models.CharField(max_length=30, verbose_name='First Name')
last_name = models.CharField(max_length=30, verbose_name='Last Name')
gender = models.CharField(_("Employee Gender"),
max_length=6, choices=GENDER_CHOICE, null=True, blank=True)
blood_group = models.CharField(
_("Employee Blood Group"), max_length=3, choices=BLOOD_GROUP_CHOICE, null=True, blank=True)
birth_of_date = models.DateField(
_("Employee Birth Date"), auto_now=False, auto_now_add=False, null=True, blank=True)
#address = models.CharField(_("Employee Address"), max_length=500, null=True, blank=True)
address = models.CharField(_("Employee Address"), max_length=500, null=True, blank=True)
phone_number = PhoneNumberField(null=True, blank=True)
profile_pic = models.ImageField(_("Employee Profile Picture"), upload_to='profile_pic',
height_field=None, width_field=None, max_length=None, null=True, blank=True)
religion = models.CharField(
_("Employee Religion"), max_length=15, choices=RELIGION_CHOICE, null=True, blank=True)
is_active = models.BooleanField(default=True)
is_admin = models.BooleanField(default=False)
is_staff = models.BooleanField(default=False)
USERNAME_FIELD = 'email'
REQUIRED_FIELDS = ('first_name', 'last_name')
objects = CustomUserManager()
def __str__(self):
return self.email
def get_short_name(self):
return self.first_name
def has_perm(self, perm, obj=None):
return self.is_admin
def has_module_perms(self, app_label):
return self.is_admin
class Meta:
verbose_name_plural = "Shunno ek Users"
Here is my CumstomUser models' CustomUsermanager
class CustomUserManager(BaseUserManager):
def create_user(self, email, first_name, last_name, password=None):
if not email:
raise ValueError('You must have an email')
email = email.lower()
first_name = first_name.title()
last_name = last_name.title()
user = self.model(
email = self.normalize_email(email),
first_name = first_name,
last_name = last_name
)
#user.password = password
user.set_password(password)
user.save(using=self._db)
return user
def create_superuser(self, email, first_name, last_name, password=None):
user = self.create_user(
email = email,
first_name = first_name,
last_name = last_name,
password = password
)
user.is_admin = True
user.is_staff = True
user.save(using=self._db)
return user
This is a model of saving users Quiz answers.
class UserAns(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='quiz_user')
quizcat = models.ForeignKey(Category, on_delete=models.CASCADE)
totalq = models.DecimalField(max_digits=5,decimal_places=2)
correcta = models.DecimalField(max_digits=5,decimal_places=2)
def __str__(self):
return self.User.first_name
It is view part where i want to save the data of user answer.
def quizpage(request, slug):
if request.method == 'POST':
# totalquestion
solve = 0
for question in range(1,cat.totalq+1):
entered_answer_questionpk = request.POST.get(str(question))
ans = entered_answer_questionpk[:1]
qpk = int(entered_answer_questionpk[1:])
actualans = Question.objects.get(pk=qpk).correct_answer
if ans == actualans:
solve = solve + 1
# print(user)
usersans = UserAns(totalq=cat.totalq, correcta=solve)
usersans.quizcat = cat
print(request.user)
usersans.user = request.user
usersans.save()
return render(request, 'quiz/quizpage.html',{'questions': questions })
after saving this value in the database, when I click the table name it gives this error:
Django Version: 3.1.3
Exception Type: AttributeError
Exception Value:
'UserAns' object has no attribute 'User'
I can't understand where is my problem.

Answer 1

Your string method is referencing self.User and not self.user.
def __str__(self):
return self.user.first_name
Previous answer:
You should also look through your view that's rendering the page and protect any parts that access userans.user via if hasattr(userans, 'user'): or if userans.user_id:.
Another thing you can do is clean up your data. Your post view looks to be about right. But that page is failing because you have instances that still have the user property with a value of None.Open up a shell manage.py shell, import your UserAns model and see if you have any instances without a user. If you do, determine which user(s) they should map to or delete them.
UserAns.objects.filter(user__isnull=True)