24 questions that come up in Django technical interviews, each with the answer and an explanation of why it is right.
Test yourself — 90 question bankAnswer: MVT (Model-View-Template)
Django follows the MVT (Model-View-Template) pattern where Models define data structure, Views handle business logic, and Templates handle presentation.
Answer: filter() returns QuerySet, get() returns single object
filter() returns a QuerySet (even if one result), while get() returns a single object and raises DoesNotExist if not found or MultipleObjectsReturned if multiple found.
Answer: Powerful toolkit for building Web APIs
DRF is a powerful and flexible toolkit for building Web APIs in Django. Includes serializers, viewsets, routers, authentication, and more.
Answer: django-admin startproject
`django-admin startproject projectname` creates a new Django project with the necessary directory structure and configuration files.
Answer: All of the above
Serializers handle conversion between complex types (models, QuerySets) and Python/JSON data. They also provide validation similar to Django Forms.
Answer: Event notifications for decoupled applications
Signals allow certain senders to notify receivers when actions occur. Common signals: pre_save, post_save, pre_delete, post_delete.
Answer: settings.py
settings.py contains all configuration settings including database configuration, installed apps, middleware, templates, and more.
Answer: Combine logic for multiple related views into one class
ViewSets combine list, create, retrieve, update, and destroy operations into a single class. Used with routers for automatic URL configuration.
Answer: To process requests and responses globally
Middleware is a framework of hooks into Django request/response processing. Each middleware component processes requests before views and responses after.
Answer: Both b and c
N+1 problem occurs when querying related objects in a loop. select_related (JOINs) and prefetch_related (separate queries) solve this by loading related data upfront.
Answer: Both a and c
Both `django-admin startapp appname` and `python manage.py startapp appname` create a new Django app with models, views, and other files.
Answer: Model.objects.bulk_create()
bulk_create() efficiently inserts multiple objects in a single query. It bypasses save() method and signals for performance.
Answer: Models
Models define the database structure as Python classes. Each model class represents a database table, and class attributes represent fields.
Answer: A many-to-one relationship
ForeignKey creates a many-to-one relationship. Each instance can reference one instance of another model. Requires on_delete parameter.
Answer: Both b and c
Transactions ensure database operations are atomic (all or nothing). Use transaction.atomic() as decorator or context manager to group operations.
Answer: python manage.py migrate
`python manage.py migrate` applies pending migrations to the database. `makemigrations` creates migration files based on model changes.
Answer: Deletes related objects when referenced object is deleted
CASCADE automatically deletes related objects when the referenced object is deleted. Other options: PROTECT, SET_NULL, SET_DEFAULT, DO_NOTHING.
Answer: Both b and c
Indexes speed up database lookups at the cost of slower writes. Add with db_index=True on fields or Meta.indexes for composite indexes.
Answer: null is database-level, blank is validation-level
null=True allows NULL in database. blank=True allows empty values in forms/validation. For text fields, use blank=True with default="" instead of null=True.
Answer: Both b and c
Celery enables asynchronous task execution, background jobs, and periodic tasks. Essential for long-running operations like email sending, report generation.
Answer: All of the above
Class-based views provide an alternative to function views using Python classes. They enable code reuse through inheritance and provide generic views like ListView, DetailView.
Answer: Command-line utility for administrative tasks
manage.py is a command-line utility that provides various administrative commands like runserver, migrate, createsuperuser, and more.
Answer: Both b and c
Custom template tags extend template functionality. Simple tags return values, inclusion tags render templates. Defined in app/templatetags/ directory.
Answer: Both b and c
Django includes middleware for CSRF protection, XSS prevention (template escaping), clickjacking (X-Frame-Options), and SQL injection prevention (ORM).
The full Django bank has 90 questions across 3 difficulty levels — timed, shuffled, and scored.
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