Valueerror: Cannot assign "'1'": "User.campus" must be a "Campus" instance. Super User registration error in Django

Question

I’m developing an application where the user needs to be on a campus. However when superuser is created in the terminal an instance error occurs.

Note: The database is correctly pre-filled to fetch the 'campus_id'.

Django 2.0.4 and python3.6

accounts/models.py

class UserManager(BaseUserManager):

def _create_user(self, email, matricula, password, is_staff, is_superuser, **extra_fields):
    now = timezone.now()
    if not matricula:
        raise ValueError(_('The given matricula must be set'))
    email = self.normalize_email(email)
    user = self.model(matricula=matricula, email=email, is_staff=is_staff, is_active=True, is_superuser=is_superuser, last_login=now, date_joined=now, **extra_fields)
    user.set_password(password)
    user.save(using=self._db)
    return user

def create_user(self, matricula, email=None, password=None, **extra_fields):
    return self._create_user(matricula, email, password, False, False, **extra_fields)

def create_superuser(self, matricula, email, password, **extra_fields):
    user=self._create_user(matricula, email, password, True, True, **extra_fields)
    user.is_active=True
    user.save(using=self._db)
    return user

class User(AbstractBaseUser, PermissionsMixin):

username = models.CharField(_('username'), max_length=15, unique=True,
    help_text=_('Required. 15 characters or fewer. Letters, numbers and @/./+/-/_ characters'),
    validators=[ validators.RegexValidator(re.compile('^[\w.@+-]+$'), _('Enter a valid username.'),
     _('invalid'))], blank=True, null=True)
name = models.CharField(_('Nome'), max_length=100, null=True, blank=True)
email = models.EmailField(_('email address'), max_length=100, unique=True)
is_staff = models.BooleanField(_('staff status'), default=False, help_text=_('Designates whether the user can log into this admin site.'))
is_active = models.BooleanField(_('active'), default=True, help_text=_('Designates whether this user should be treated as active. Unselect this instead of deleting accounts.'))
is_trusty = models.BooleanField(_('trusty'), default=False, help_text=_('Designates whether this user has confirmed his account.'))
date_joined = models.DateTimeField(_('date joined'), auto_now_add=True)
matricula = models.CharField(
    'Matricula', max_length=25, unique=True)
tipo = models.IntegerField(choices = ((1, 'Docente'),
                                (2, 'Discente'),
                                (3, 'Técnico Administrativo')), default=1)
campus = models.ForeignKey(Campus, on_delete=models.PROTECT)
cpf = models.CharField(max_length=30, unique=True, null=True, blank=True)

USERNAME_FIELD = 'matricula'
REQUIRED_FIELDS = ['name', 'email', 'tipo', 'cpf', 'campus']

objects = UserManager()

class Meta:
    verbose_name = _('user')
    verbose_name_plural = _('users')

def get_full_name(self):
    full_name = '%s %s' % (self.name, self.name)
    return full_name.strip()
def get_short_name(self):
    return self.name
def email_user(self, subject, message, from_email=None):
    send_mail(subject, message, from_email, [self.email])

py Settings.

AUTH_USER_MODEL = 'contas.User'

institutions/models.py

class Instituicao(models.Model):
nome = models.CharField(max_length=70, null=False, blank=False)
razao_social = models.CharField(max_length=100, null=False, blank=False)
cnpj = models.CharField(max_length=30, null=False, blank=False)
sigla = models.CharField(max_length=10, null=False, blank=False)
estado = models.ForeignKey(Estado, on_delete=models.PROTECT, blank=True)

def __str__(self):
    return self.sigla

class Meta:
    verbose_name = 'Instituição'
    verbose_name_plural = 'Instituições'


class Campus(models.Model):
nome = models.CharField(max_length=50, null=False)
sigla = models.CharField(max_length=10, null=False)
endereco = models.ForeignKey(Endereco, on_delete=models.PROTECT)
instituicao = models.ForeignKey(Instituicao, on_delete=models.PROTECT)
ddd_telefone = models.CharField(max_length=2, null=False)
telefone = models.CharField(max_length=9, null=False)

def __str__(self):
    return self.nome

class Meta:
    verbose_name = 'Campus'
    verbose_name_plural = 'Campi'

Answer 1

By the image shown you are trying to save the field id. But Django needs the campus instance (which has the pk). Hence the exception of the type ValueError The right would be something like:

campus = Campus.objects.get(pk=1)