After users create an account, they should be able to enroll in courses. In order to store enrollments, we need to create a many-to-many relationship between the Course and User models.
Edit the models.py file of the courses application and add the following field to the Course model:
students = models.ManyToManyField(User, related_name='courses_joined', blank=True)
From the shell, execute the following command to create a migration for this change:
python manage.py makemigrations
You will see an output similar to this:
Migrations for 'courses': courses/migrations/0004_course_students.py - Add field students to course
Then, execute the next command to apply pending migrations:
python manage.py migrate
You should see output ...
