Django Django 3

Question 1

What does the related_name argument on a ForeignKey control?

Accepted Answer

The reverse accessor name from the related model

Answer

related_name sets the attribute used to access the relationship backward from the related object.

Question 2

Which on_delete option deletes child rows when the referenced parent is deleted?

Accepted Answer

CASCADE

Answer

models.CASCADE removes objects that reference a deleted parent record.

Question 3

What is the purpose of Django's select_related() method?

Accepted Answer

Reduce queries by SQL-joining foreign key relations

Answer

select_related performs a SQL join to fetch related objects in one query, avoiding N+1 problems.

Question 4

In Django REST framework, what class is commonly used to convert model instances to JSON?

Accepted Answer

Serializer

Answer

Serializers translate complex types like model instances into native Python types for JSON rendering.

Question 5

Which file maps URL patterns to views in a Django app?

Accepted Answer

urls.py

Answer

urls.py defines urlpatterns that route incoming requests to view functions or classes.

Django Practice Test