I have a question while creating a long-range model.

1) For the first time, the corresponding settings.The string value of the user model specified in AUTH_USER_MODEL is retrieved.

2) In the case of the number of times, the user object applied with the user model itself is imported.

Therefore, you can write number 1 when you import only the path to the app, and number 2 when you need the object itself. For example, when you need ForeignKey, you can use it because you need a model path (?) rather than an entire object in the field below, and you can use it like the bottom if you need a specific field in user.

Example 1

model_exam = models.ForeignKey(settings.AUTH_USER_MODEL, verbose_name="Custom", on_delete=models.CASCADE)

Example #2

user = get_user_model()
print(user.username)