Build your first app + model
Create a Django project and app. Add a Note model with title and created_at, run makemigrations/migrate, and verify records in admin.
Backend & Runtime / Knowledge library
Django
a batteries-included python web framework
Why learn Django?
Django helps teams ship secure, database-driven web apps fast by bundling core back-end needs: routing, ORM, auth, admin, forms, security protections, and templating in one coherent framework.
Where it came from
Django began in the early 2000s at the Lawrence Journal-World to support fast newsroom development. It was open-sourced in 2005 under a BSD license. Django 1.0 and the Django Software Foundation both arrived in 2008, formalizing governance and long-term growth. Its design philosophy emphasizes rapid development, explicit conventions, and pragmatic defaults.
- Django began in the early 2000s at the Lawrence Journal-World to support fast newsroom development.
- It was open-sourced in 2005 under a BSD license.
- Django 1.0 and the Django Software Foundation both arrived in 2008, formalizing governance and long-term growth.
- Its design philosophy emphasizes rapid development, explicit conventions, and pragmatic defaults.
Build your understanding
Work through these exercises in order. Try the task before opening a reference.
- Create a Django project and app. Add a Note model with title and created_at, run makemigrations/migrate, and verify records in admin.
- Implement ListView, DetailView, CreateView, UpdateView, and DeleteView for a Post model. Add success messages and login protection for write actions.
- Using Django REST Framework, create authenticated endpoints for Task objects with pagination, filtering, and per-user data isolation. Add tests for permissions and validation.
- Profile a slow queryset, remove N+1 queries with select_related/prefetch_related, add caching for a hot endpoint, and document before/after metrics.
- Containerize a Django app with PostgreSQL, run collectstatic, configure environment-based settings, and deploy with health checks and secure secret handling.
More ways to practice
CRUD with class-based views
Implement ListView, DetailView, CreateView, UpdateView, and DeleteView for a Post model. Add success messages and login protection for write actions.
Production-ready API slice
Using Django REST Framework, create authenticated endpoints for Task objects with pagination, filtering, and per-user data isolation. Add tests for permissions and validation.
Performance + reliability pass
Profile a slow queryset, remove N+1 queries with select_related/prefetch_related, add caching for a hot endpoint, and document before/after metrics.
Deployable mini-service
Containerize a Django app with PostgreSQL, run collectstatic, configure environment-based settings, and deploy with health checks and secure secret handling.
Documentation and sources
- Official documentation (docs.djangoproject.com)
- Official tutorial (start here) (docs.djangoproject.com)
- Django 5.0 release notes (docs.djangoproject.com)
Catalog research notes
- Django 5.0 added database-generated values support (for example, model field db_default and GeneratedField use cases).
- Django 5.0 improved Django admin usability, including optional facet counts in filters.
- Recent releases continue strengthening async-ready request handling and modern deployment patterns (ASGI-friendly stacks).
- Django 4.2 is an LTS release commonly used by teams that need longer maintenance windows.
Connect the ideas
Explore next
Real World Example
Automated Inventory Tracking for Boutique Retailers
Small boutique retailers managing diverse product catalogs across physical and online storefronts.
The business problem
Manual inventory updates lead to overselling items, resulting in customer dissatisfaction and high administrative costs for order cancellations.
How this topic solves it
Django provides a robust model layer and built-in admin interface that allows retailers to define complex data relationships and manage inventory states through a centralized, secure dashboard.
- Define product and stock models using the Django model layer to represent inventory items and their availability.
- Implement the Django admin site to provide staff with an immediate, user-friendly interface for manual stock adjustments.
- Utilize Django QuerySets to perform atomic database updates when orders are placed, ensuring data consistency.
- Configure Django signals to trigger automated notifications or stock-level alerts when inventory falls below a defined threshold.
Shows the relationship between product catalog entries and their specific stock availability.
Stores name, description, and base price
Stores quantity and location ID
Provides CRUD operations for staff
- Product → has_many → StockLevel
- AdminInterface → manages → Product
- AdminInterface → updates → StockLevel
Implementation example
This maps to the business scenario by creating a structured data relationship between products and their specific inventory counts, enabling the system to track stock levels accurately.
from django.db import models
class Product(models.Model):
name = models.CharField(max_length=200) # Define product identity
class StockLevel(models.Model):
product = models.ForeignKey(Product, on_delete=models.CASCADE) # Link stock to product
quantity = models.IntegerField() # Track current availabilityExpected business outcome
Retailers achieve real-time synchronization of stock levels, significantly reducing the risk of overselling and improving operational transparency.
Limitations and checks
The built-in admin interface is highly coupled to the model structure; as business logic grows, complex custom views may be required, which can be checked by monitoring the maintainability of the admin.py file.