How can I make a user out of a model in Django? - django

Question

I'm currently developing a web-application for managing driving licenses as a web development homework assignment. Instead of just storing information on every driver as a model I want to make a user for each driver. What is the easiest way to do so? What am I doing wrong?
I updated a car owner model so that it is now inherited from djangdo Abstract User.
# models.py
class Car_owner(AbstractUser):
id_owner = models.IntegerField(primary_key=True)
last_name = models.CharField(max_length=30, null=False)
first_name = models.CharField(max_length=30, null=False)
birth_date = models.DateField(null=True)
passport = models.IntegerField(null=True, blank=True)
address = models.CharField(max_length=50, null=True, blank=True)
nationality = models.CharField(max_length=15, null=True, blank=True)
# username = models.CharField(max_length=16, unique=True, default=uuid4)
# password = models.CharField(max_length=16, default='password')
I also have forms.py file:
from django import forms
from project_first_app.models import Car_owner
class CreateOwner(forms.ModelForm):
class Meta:
model = Car_owner
fields = ['id_owner', 'last_name', 'first_name', 'birth_date', 'passport', 'address', 'nationality']
But when migrating I get the following issue:
UNIQUE constraint failed: new__project_first_app_car_owner.username
In migrations files I have:
migrations.AddField(
model_name='car_owner',
name='username',
field=models.CharField(default=uuid.uuid4, max_length=16, unique=True),
),
and then:
migrations.AlterField(
model_name='car_owner',
name='username',
field=models.CharField(error_messages={'unique': 'A user with that username already exists.'}, help_text='Required. 150 characters or fewer. Letters, digits and #/./+/-/_ only.', max_length=150, unique=True, validators=[django.contrib.auth.validators.UnicodeUsernameValidator()], verbose_name='username'),
),
Those are automatically generated.

Answer 1

You have commented username and password in your model, why ?
Password field already exists in the abstractbaseuser, so comment it does not remove it. The abstract model user of Django need a unique information for authenticating user. You can use a Username or an Email.
For using the email instead of username, you can define USERNAME_FIELD = "email" in your class. But you have to define a field email, or you keep username field and add it to fields ModelForm.
There is a constraint on the username field (or email field), so you have to define it for each Car_owner you want to create (it is for authenticating purpose).
your field id_owner is useless, Django create automatically a field called id in each model which is the primary key.
so for resolving your problem easily, add username in fields list of your Form for beginning.