Where is django.contrib.auth.User defined in Django source code

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In Django official guide, it reads:

Inside this django.contrib.auth model, there is a User class, who has following attributes (username, password, email, first_name, last_name).

When I check the source code in github, I did not find this definition in django.contrib.auth.
I can only see class AbstractBaseUser(models.Model): in django/contrib/auth/base_user.py on this link, and class User(AbstractUser): in django/contrib/auth/models.py in this webpage.

Q1: what does class models.User mean in above official document, it means User is a class under models.py ?

Q2: if above is right, then where User class get attributes such as username, email etc?

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1 Answers

Q1: what does class models.User mean in above official document, it means User is a class under models.py?

In Django one refers to a model with the app_name.ModelName. So if you specify a model, this is implemented in the app_name/models.py, but since models are defined in the models.py file, it makes no sense to include that in the name of the model.

For example the default for the AUTH_USER_MODEL setting [Django-doc] is auth.User, since the name of the app is auth, and the name of the model is User.

Q2: if above is right, then where User class get attributes such as username, email etc?

Through inheritance. Indeed if we look at the source code of the models.py file [GitHub], we see:

class User(AbstractUser):
    """
    Users within the Django authentication system are represented by this
    model.
    Username and password are required. Other fields are optional.
    """
    class Meta(AbstractUser.Meta):
        swappable = 'AUTH_USER_MODEL'

and the AbstractUser model [GitHub] defines the fields for username, email, etc.:

class AbstractUser(AbstractBaseUser, PermissionsMixin):
    # …

    username = models.CharField(
        _('username'),
        max_length=150,
        unique=True,
        help_text=_('Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only.'),
        validators=[username_validator],
        error_messages={
            'unique': _("A user with that username already exists."),
        },
    )
    first_name = models.CharField(_('first name'), max_length=150, blank=True)
    last_name = models.CharField(_('last name'), max_length=150, blank=True)
    email = models.EmailField(_('email address'), blank=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.'
        ),
    )
    date_joined = models.DateTimeField(_('date joined'), default=timezone.now)
    
    # …

AbstractUser is an abstract model. This means that Django does not create a table for it. Models that inherit from an abstract table will thus inherit fields, methods, etc. and these fields will then be defined on the model that inherits from AbstractUser.

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