duplicate key value violates unique constraint in django

Question

I have function for creating new user in django as follows:

def initialize(username, password, email, title, firstName, lastName,  telephoneNumber, mobileNumber, smsActive, for_company_id = 1):
    sUsername = username.lower()
    if len(username) > 30:
        sUsername = username[:30].lower()
    user = User.objects.create_user(sUsername, email, password, last_login=datetime.datetime.now())
    user.first_name = firstName
    user.last_name = lastName
    user.save()
    userProfile = UserProfile(user = user, title = title, telephone = telephoneNumber, mobile = mobileNumber, smsActive = smsActive)
    userProfile.code2Factor = pyotp.random_base32()
    userProfile.forCompanyId = for_company_id
    userProfile.main_updated = datetime.datetime.now()
    userProfile.save()
    return userProfile

Then I do it as follows:

user_profile = initialize(input.user.username, password, '', input.title, input.user.first_name, input.user.last_name, input.telephone, input.mobile, sms_active)
user_profile.user.groups.set([Group.objects.get(id=gr.id) for gr in input.groups])
user_profile.cultureMajor = input.cultureMajor
user_profile.offerTax = input.offerTax if 'offerTax' in input else False
user_profile.user.save()

But when I try to create new user I get error as follows:

duplicate key value violates unique constraint "auth_user_pkey" DETAIL: Key (id)=(21811) already exists.

The id 21811 exists in the database but the last one is 25530.

Why django does not use the first next number for ID?

UPDATE

• User model is standard model from django.

• UserProfile is as follows:

  class UserProfile(models.Model):
      forCompanyId = 1
      user = models.OneToOneField(to=User, on_delete=models.DO_NOTHING)
      title = models.CharField(max_length=10, null=True, blank=True)
      telephone = models.CharField(max_length=50, null=True, blank=True)
      mobile = models.CharField(max_length=50, null=True, blank=True)
      smsActive = models.BooleanField(default=False)
      car_by_car_notification = models.BooleanField(default=True)
      car_by_car_mail = models.BooleanField(default=True)
      daily_digest = models.BooleanField(default=True)
      offer_tax = models.BooleanField(default=False)
      cultureMajor = models.CharField(max_length=3, blank=False, default='en')
      cultureMinor = models.CharField(max_length=3, blank=True)
      modulesBlocked = models.ManyToManyField(to=Module, through='UserModuleBlocked')
      otherEmails = models.CharField(max_length=512, null=True, blank=True)
      otherContact = models.CharField(max_length=256, null=True, blank=True)
      browser = models.CharField(max_length=256, null=True, blank=True)
      picture = models.ImageField(upload_to=settings.MEDIA_ROOT, blank=True, null=True)
      code2Factor = models.CharField(max_length=256, null=True, blank=True)
      mobile2Factor = models.BooleanField(default=False)
      authenticator2Factor = models.BooleanField(default=False)
      main_user_id = models.IntegerField(null=True)
      main_updated = models.DateTimeField(_('date updated on main'), default=timezone.now)
  

Answer 1

I've solved the problem by executing following code:

BEGIN;
SELECT setval(pg_get_serial_sequence('"auth_permission"','id'), coalesce(max("id"), 1), max("id") IS NOT null) FROM "auth_permission";
SELECT setval(pg_get_serial_sequence('"auth_group_permissions"','id'), coalesce(max("id"), 1), max("id") IS NOT null) FROM "auth_group_permissions";
SELECT setval(pg_get_serial_sequence('"auth_group"','id'), coalesce(max("id"), 1), max("id") IS NOT null) FROM "auth_group";
SELECT setval(pg_get_serial_sequence('"auth_user_groups"','id'), coalesce(max("id"), 1), max("id") IS NOT null) FROM "auth_user_groups";
SELECT setval(pg_get_serial_sequence('"auth_user_user_permissions"','id'), coalesce(max("id"), 1), max("id") IS NOT null) FROM "auth_user_user_permissions";
SELECT setval(pg_get_serial_sequence('"auth_user"','id'), coalesce(max("id"), 1), max("id") IS NOT null) FROM "auth_user";
COMMIT;