400 Django Interview Questions with Answers 2026

Models, ORM & Database Engineering: QuerySet optimization, Migrations, Signals, and Indexing.

Views, APIs & Backend Engineering: Class-Based Views (CBVs), Django REST Framework (DRF), Serializers, and Async Django.

Security, Testing & Production Readiness: CSRF/XSS protection, Unit Testing with pytest, and Deployment checklists.

System Design & Performance: Redis caching, Dockerization, Microservices architecture, and Rate limiting.

B) select_related()

C) values_list()

D) defer()

E) only()

F) annotate()

Correct Answer: B

Overall Explanation: The N+1 problem occurs when the database is hit once for the main object and then once again for every related object. In Django, select_related works by creating a SQL join and including the fields of the related object in the SELECT statement.

Detailed Option Explanations:

B) Correct: select_related is the standard tool for "forward" ForeignKey or One-to-One relationships to perform a SQL JOIN.

C) Incorrect: values_list returns tuples instead of model instances; it doesn't solve the relationship join overhead.

D) Incorrect: defer is used to stay away from loading specific large fields (like Blobs) until accessed.

E) Incorrect: only is the opposite of defer; it limits the initial fields loaded but doesn't handle joins.

F) Incorrect: annotate is used for aggregations (like Count or Sum) rather than fetching related model instances.

Question 2: Which component in the Django request/response cycle is responsible for processing the request before it reaches the view or the response before it leaves the server?

B) Context Processor

C) Middleware

D) Template Engine

E) Router

F) Model Manager

Correct Answer: C

Overall Explanation: Middleware is a framework of hooks into Django's request/response processing. It’s a light, low-level “plugin” system for globally altering Django’s input or output.

Detailed Option Explanations:

B) Incorrect: Context processors are used to inject data into all templates, not to intercept the request object globally.

C) Correct: Middleware classes have methods like process_request and process_response specifically for this purpose.

D) Incorrect: The Template Engine renders HTML and does not handle the logic of the request/response flow.

E) Incorrect: The Router (or URLconf) maps the URL to a view but doesn't process the request data itself.

F) Incorrect: Model Managers handle database queries and business logic at the data layer.

Question 3: When building a production-ready API with Django REST Framework, which setting is most critical to prevent a Single Point of Failure or a Denial of Service (DoS) via brute force?

B) DEFAULT_RENDERER_CLASSES

C) DEFAULT_THROTTLE_CLASSES

D) DEFAULT_PERMISSION_CLASSES

E) DEFAULT_AUTHENTICATION_CLASSES

F) DEFAULT_FILTER_BACKENDS

Correct Answer: C

Overall Explanation: Throttling is the process of limiting the rate of requests that users can make to an API. This is vital for security and ensuring that one user doesn't crash the server.

Detailed Option Explanations:

B) Incorrect: Renderers determine the output format (JSON, XML), which has little to do with DoS protection.

C) Correct: Throttling classes (like AnonRateThrottle or UserRateThrottle) control the request rate.

D) Incorrect: Permissions check if a user can access a resource, but they don't limit how often they access it.

E) Incorrect: Authentication identifies the user but does not provide rate-limiting functionality.

F) Incorrect: Filtering allows users to narrow down results but doesn't protect the server's availability.

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