I have a Django application with users. I have a model called "Course" with a foreign key called "teacher" to the default User model that Django provides:

class Course(models.Model):
    ...
    teacher = models.ForeignKey(User, related_name='courses_taught')

When I create a model form to edit information for individual courses, the possible users for the teacher field appear in this long select menu of user names.

These users are ordered by ID, which is of meager use to me. How can I

1. order these users by their last names?
2. change the string representation of the User class to be "Firstname Lastname (username)" instead of "username"?