Question 1

What is the main difference between Model.objects.raw() and connection.cursor() for executing raw SQL in Django?

Accepted Answer

Model.objects.raw() returns automatically mapped model instances, preserving ORM benefits like attribute access and relations. connection.cursor() returns a raw database cursor with tuples, offering more flexibility for queries not tied to a specific model, but requiring manual result handling.

Question 2

What is the main advantage of creating a custom Manager in Django rather than adding methods directly to the model?

Accepted Answer

A custom Manager encapsulates table-level query logic, allowing method chaining with QuerySets and reusing this logic everywhere the model is used. Model methods operate on individual instances. The Manager also allows modifying the default QuerySet with get_queryset().

Question 3

How to implement a custom QuerySet to enable chaining of custom methods in Django?

Accepted Answer

To enable chaining, create a class inheriting from QuerySet with methods returning self or a filtered QuerySet. Then use the custom QuerySet via Manager.from_queryset() or define a custom Manager with get_queryset() returning the custom QuerySet. This allows calling Model.objects.custom_method().filter().

Advanced Django ORM

What is the main difference between Model.objects.raw() and connection.cursor() for executing raw SQL in Django?

Câu trả lời

What is the main advantage of creating a custom Manager in Django rather than adding methods directly to the model?

Câu trả lời

How to implement a custom QuerySet to enable chaining of custom methods in Django?

Câu trả lời

Which Django expression to use for atomically incrementing a counter in the database without race condition risk?

What is the function of transaction.atomic() and how does it handle exceptions in Django?

Các chủ đề phỏng vấn Django khác

Python Basics

Python OOP

Django Fundamentals

Django Models - Basics

Django Views

Django Templates

Django Forms

Advanced QuerySets

Django Authentication

Django Middleware

Django Admin

Django REST Framework

Django Signals

File Upload

Django Caching

Django Sessions

Django Email

Django Testing

Django Security

Django Deployment

Django Performance

Django & Celery

Django Channels

Django & GraphQL

Django & Docker

Django in Microservices Ecosystem

Custom Django Commands

Django Internationalization

Django Design Patterns

Django Async & ASGI

Settings & Production Configuration

Observability & Monitoring

Nắm vững Django cho lần phỏng vấn tiếp theo