Instruction: Discuss the methods available for extending the Django User model and the scenarios in which they are applicable.
Context: This question evaluates the candidate's knowledge of Django's authentication framework and their ability to modify the User model to fit the application's needs.
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First and foremost, extending the existing User model using a One-To-One link. This is perhaps the most straightforward approach, where you create a new model that holds all the additional information and is linked to Django's User model with a OneToOneField. This method is particularly useful when you want to add extra data for each user without altering the existing User model. For example, you might want to store user preferences or profile information. Here, the key metric could be the query performance, which remains efficient as long as the relationships and indexes are properly managed.
```python from django.contrib.auth.models import User from django.db import models...