# models.py

from django.db import models
from django.conf import settings
# Create your models here.


class UserRegistrationModel(models.Model):
    user = models.OneToOneField(
        settings.AUTH_USER_MODEL, on_delete=models.CASCADE)

The models.py file defines a Django model named UserRegistrationModel that establishes a one-to-one relationship with the default user model in Django, which is specified in the settings.AUTH_USER_MODEL setting.

Let’s break down the code to understand its purpose:

  1. from django.db import models: This imports the models module from Django, which provides the tools for defining database models.

  2. from django.conf import settings: This imports the settings module from Django, which allows access to the application’s settings.

  3. class UserRegistrationModel(models.Model):: This defines a Django model named UserRegistrationModel. The model inherits from models.Model, which is the base class for all Django models.

  4. user = models.OneToOneField(settings.AUTH_USER_MODEL, on_delete=models.CASCADE): This line defines a field named user of type OneToOneField. The OneToOneField establishes a one-to-one relationship between UserRegistrationModel and the model specified in settings.AUTH_USER_MODEL.

    • settings.AUTH_USER_MODEL: This refers to the Django user model that is currently being used for authentication in the project. It allows the UserRegistrationModel to establish a one-to-one relationship with the user model, which means each UserRegistrationModel instance can be associated with only one user, and vice versa.

    • on_delete=models.CASCADE: This argument specifies the behavior when the referenced user is deleted. In this case, models.CASCADE means that when a user is deleted, the corresponding UserRegistrationModel instance will also be deleted.

The purpose of this model seems to be to extend the default user model in the Django application and add additional information related to user registration. By using a one-to-one relationship, it ensures that each user has only one associated registration instance, and it allows you to keep the user-related data separate from the default user model while maintaining a direct relationship between them.