Welcome to the first lesson of our course on "Advanced Database Schema Design in Django." In this lesson, we will introduce you to the concept of one-to-one relationships in databases. Understanding how to create and manage these relationships is essential for building robust and efficient applications.

By the end of this lesson, you will know how to:

1. Create a Note model.
2. Link the Note model to an existing Todo model using a one-to-one relationship.
3. Create serializers for both models.
4. Use fixtures to pre-load data.
5. Write tests to ensure everything works correctly.

Let's get started!

Before we dive into creating new models, let's quickly recap our existing setup. In previous lessons, you learned how to create a Todo model. Here is what the model looks like:

This model represents tasks that need to be done, with fields for the task name, completion status, priority, assignee, and group information.

Now, let's create a Note model to represent notes that can be linked to tasks.