Django Django Models & ORM 2

Question 1

Which Django command applies pending database migrations?

Accepted Answer

python manage.py migrate

Answer

python manage.py makemigrations

Answer

python manage.py syncdb

Answer

python manage.py applydb

Question 2

What is a QuerySet in Django?

Accepted Answer

A lazy collection of database objects that can be filtered and chained

Answer

A single database row

Answer

A SQL query string

Answer

A database connection object

Question 3

Which method would you call to create and save a new model instance in one step?

Accepted Answer

Model.objects.create()

Answer

Model.objects.new()

Answer

Model.objects.save()

Answer

Model.objects.insert()

Question 4

What does `select_related()` do in a Django QuerySet?

Accepted Answer

Performs a SQL JOIN to fetch related objects in a single query

Answer

Lazy-loads related objects on access

Answer

Prefetches many-to-many related objects

Answer

Caches QuerySet results in memory

Question 5

Which lookup suffix checks if a field value is in a given list in Django ORM?

Accepted Answer

__in

Answer

__contains

Answer

__list

Answer

__among

Question 6

What is the purpose of `prefetch_related()` in Django ORM?

Accepted Answer

Fetches many-to-many and reverse ForeignKey relations in separate optimized queries

Answer

Performs a single JOIN query for all relations

Answer

Caches model instances in Redis

Answer

Pre-loads all model fields