Django how to make user model username unique=False

[chern...@gmail.com]

I am trying to make username unique = false as there are cases where username is not needed. Since i am using email address to login.

But with the django user model, how do i customise it ? 

Here is the code for my current user model:

from django.db import models
from django.contrib.auth.models import AbstractUser
from django.contrib.auth.models import UserManager
from django.db.models import Q
from django.core.validators import RegexValidator


class CustomUserManager(UserManager):

    def get_by_natural_key(self, username):
        return self.get(
            # this comment is to prevent user from using username to login
            # Q(**{self.model.USERNAME_FIELD: username}) |
            Q(**{self.model.EMAIL_FIELD: username})
        )


class MyUser(AbstractUser):
    userId = models.AutoField(primary_key=True)
    gender = models.CharField(max_length=6, blank=True, null=True)
    nric = models.CharField(max_length=40, blank=True, null=True)
    birthday = models.DateField(blank=True, null=True)
    birthTime = models.TimeField(blank=True, null=True)
    ethnicGroup = models.CharField(max_length=30, blank=True, null=True)
    favoriteClinic = models.CharField(max_length=50, blank=True, null=True)
    appVer = models.CharField(max_length=50, blank=True, null=True)
    osVer = models.CharField(max_length=50, blank=True, null=True)
    mobileType = models.IntegerField(blank=True, null=True)
    country_code = models.IntegerField(blank=True, null=True)
    # mobile_regex = RegexValidator(regex=r'^(\+\d{1,3})?,?\s?\d{8,13}$', message="Phone number must not consist of space and requires country code. eg : +6591258565")
    mobileNo = models.CharField(max_length=25, blank=True, null=True)  # validators should be a list
    height = models.FloatField(blank=True, null=True)
    weight = models.FloatField(blank=True, null=True)
    bloodtype = models.CharField(max_length=3, blank=True, null=True)
    allergy = models.CharField(max_length=30, blank=True, null=True)
    # image1 = models.ImageField(upload_to=)
    # image = models.BinaryField(editable=True, blank=True, null=True)
    # displaypicture = models.ImageField
    objects = CustomUserManager()

    def __str__(self):
        return self.username

[Andréas Kühne]

Hi,

This is how I created my User model that does what you require:

class User(AbstractBaseUser, PermissionsMixin, AuditableModel):
    first_name = models.CharField(_('first name'), max_length=30, blank=True)
    last_name = models.CharField(_('last name'), max_length=30, blank=True)
    email = models.EmailField(_('email address'), blank=False, null=False, 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.'
        ),
    )
    objects = CustomUserManager()

    EMAIL_FIELD = 'email'
    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

    def clean(self):
        """
        Override the default clean method to include normalization of the email field.
        """
        super().clean()
        self.email = self.__class__.objects.normalize_email(self.email)

    def get_full_name(self):
        """
        Returns the first_name plus the last_name, with a space in between if set, otherwise the email address.
        """
        full_name = f'{self.first_name} {self.last_name}'.strip()

        if not full_name:
            full_name = self.email

        return full_name

    def get_short_name(self):
        "Returns the short name for the user."
        return self.first_name

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

The reason for the CustomUserManager is to override some methods when creating users.

By setting the USERNAME_FIELD to 'email' you can remove the CustomUserManager that you have declared (which by the way I don't think will work). You can check here for more information about creating your own user model with email as username field:

https://www.fomfus.com/articles/how-to-use-email-as-username-for-django-authentication-removing-the-username

Here you can also see the CustomUserManager that will be required. :-)

Regards,

Andréas

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[chern...@gmail.com]

Thanks for these improvement. But the main thing i want is to make username field unique = false

[chern...@gmail.com]

The reason is because i want to add some user without entering their username. As i manage to allow null input for username but the unique for username make it an error if i add another user without username. These user are used for adding family member. For eg creating a 3 years old baby profile as family member.