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CS Notes

Django Overview

Django is a “batteries-included” web framework written in Python, meaning it comes packed with almost everything you need right out of the box. It follows the model-template-view (MTV) pattern, which is just a way of organizing your code into clear, separate parts. Django is built to help developers go from an idea to a finished app quickly. It focuses on reusing code, building things fast, and following the “don’t repeat yourself” (DRY) rule, which simply means you shouldn’t write the same code twice if you can avoid it.

Prerequisites

Section titled “Prerequisites”

Before you dive into Django, it helps to already know a bit about the following:

  • Python: Django is built using Python, so you should be comfortable with Python first. This means understanding the basic syntax, common data structures, and the basics of object-oriented programming.
  • Web Development: It helps to have a basic idea of how the web works in general - things like HTTP, HTML, CSS, and JavaScript - before working with Django.
  • Databases: Since Django talks to databases to store and fetch data, it’s important to know a bit about databases and SQL.

What is Django?

Section titled “What is Django?”

Django is a high-level web framework, which just means it handles a lot of the complicated stuff for you, so you can build things faster and in a cleaner way. It comes packed with features right from the start, like an ORM (a tool that lets you talk to your database using Python instead of writing raw SQL), a ready-made admin interface for managing your app’s data, and built-in support for user login systems. People call it “batteries-included” because it already comes with so much functionality that you’d otherwise have to build yourself from scratch.

Key Features of Django

Section titled “Key Features of Django”

  1. ORM (Object-Relational Mapping): Django’s ORM lets you work with your database using plain Python code, instead of writing raw SQL queries by hand. This extra layer makes working with databases much easier, and lets you reuse your code more easily too.

  2. Admin Interface: Django automatically builds an admin panel for you, based on your models. This means you can manage your app’s data without having to build a custom interface yourself.

  3. Authentication System: Django comes with a solid, ready-made login system that takes care of things like signing up, logging in, logging out, managing passwords, and handling permissions.

  4. URL Routing: Django has a flexible system for setting up URLs, so you can create clean, easy-to-read links for your app.

  5. Template Engine: Django’s template engine lets you build dynamic HTML pages, while keeping the “look” of your app separate from the actual logic behind it.

  6. Security: Django comes with built-in protection against common web problems, like SQL injection, cross-site scripting (XSS), and cross-site request forgery (CSRF).

  7. Scalability: Django is built to handle a lot of traffic, and you can scale it up easily by adding more servers or using caching.

Why Use Django?

Section titled “Why Use Django?”

Django is a great choice for web development for a bunch of reasons:

  • Rapid Development: Django’s built-in tools and features let you build apps quickly and efficiently, so you can get your project out the door faster.
  • Scalability: Django can handle heavy traffic and large amounts of data, which makes it a good fit for both small and big applications.
  • Security: Django’s built-in security features help protect your app from common web problems, so you can feel more at ease while handling sensitive data.
  • Community Support: Django has a big, active community that keeps improving it and offers help through forums, documentation, and lots of third-party packages.
  • Versatility: Django works well for all kinds of projects, from simple websites all the way up to complex web apps and APIs.
  • Python Integration: Since Django is built on Python, it works smoothly with other Python libraries and tools, which makes it a great choice if you’re already comfortable with Python.

Where Not to Use Django?

Section titled “Where Not to Use Django?”

Even though Django (and Django REST Framework alongside it) is powerful and flexible, there are some cases where it might not be the best fit:

  • Small Projects: For very small projects or simple APIs, Django can feel like overkill. It comes loaded with features like an ORM, authentication, and an admin panel, which you might not even need. In these cases, a smaller framework like Flask or FastAPI works better.

  • High-Performance, Low-Level Systems: If your app needs very high performance with tight control over memory and execution (like systems programming or highly optimized services), Django’s extra layers can slow things down a bit. In these cases, languages and frameworks like Go or Rust are a better fit.

  • Lightweight Microservices: For small, independent microservices that each do just one simple job, Django can feel too heavy because of its full, all-in-one structure. Lighter frameworks like FastAPI or Express.js are usually more efficient for this kind of work.

  • Applications Without Heavy Database Usage: Django is closely tied to its own ORM. If your app mostly talks to outside APIs, or uses a non-relational database and doesn’t really need a full ORM, Django might end up adding more complexity than it’s worth.

  • Serverless or Function-Based Architectures: Django isn’t really built for serverless setups, mainly because it takes a bit longer to start up and has more dependencies. Lighter frameworks like FastAPI or Node.js usually work better for these kinds of deployments.

Roadmap of Django

Section titled “Roadmap of Django”

  1. Core Django: Learn the basics of Django to build a strong backend foundation.

    1. Django Fundamentals: Understand the project structure, apps, views, URLs, and templates. Learn how Django actually works behind the scenes.

    2. Templates & Static Files: Learn about template inheritance, tags, filters, and how to manage static files (CSS, JS, images).

    3. Django Debug Tools: Use the Django Debug Toolbar, logging, and VS Code debugging to track down and fix issues.

    4. Django Models: Create models, set up relationships (OneToOne, ForeignKey, ManyToMany), and organize your apps.

    5. Database Management: Learn about migrations, schema changes, and how to connect to databases like MySQL or PostgreSQL.

    6. Django ORM & Queries: Learn to do CRUD (Create, Read, Update, Delete), filtering, and aggregation, and speed up your queries using select_related and prefetch_related.

    7. Django Admin: Customize the admin panel, and add filters, search, inline models, and validation rules.

    8. Django Forms: Learn to handle forms, validate input, and process what users type in.

  2. Django REST Framework (DRF): Build APIs using Django.

    1. DRF Fundamentals: Learn the basics of REST, serializers, API views, and the request/response cycle.

    2. DRF Serializers: Work with ModelSerializer, validation, nested serializers, and custom fields.

    3. DRF Views: Learn to use function-based views, class-based views, and generic views.

    4. ViewSets & Routers: Use ModelViewSet and routers to make building APIs much simpler.

    5. Filtering, Search & Pagination: Add filtering, searching, ordering, and pagination to your APIs.

    6. Authentication: Learn token-based auth, JWT, and Django’s own authentication system.

    7. Permissions & Security: Apply permissions, role-based access, and keep your APIs secure.

  3. Advanced Django & Production: Get your project ready for the real world.

    1. Media & File Handling: Learn to upload files and images, validate them, and serve media files.

    2. Email System: Learn to send emails using SMTP and email templates.

    3. Background Tasks (Celery): Run tasks in the background using Celery and Redis.

    4. Caching: Make your app faster using Redis and Django’s caching system.

    5. Testing: Write unit tests, API tests, and learn to use fixtures.

    6. Performance Testing: Use tools like Locust to test performance and fix slow spots.

    7. Production Setup: Set up static files, logging, environment variables, and Gunicorn.

    8. Deployment: Deploy your app using Docker or Heroku, and set up your database, Redis, and environment configs.

Setup and Installation

Section titled “Setup and Installation”

To get started with Django, you’ll first need to set up your development environment. Here are the steps to install Django and create your very first project:

  1. Install UV: UV is a fast, modern Python package manager that makes it easy to manage your dependencies and virtual environments. You can install UV like this:

    Terminal window
    scoop install main/uv

  2. Initialize UV project: Create a new folder for your Django project, move into it, and then set up a new UV project:

    Terminal window
    uv init

  3. Install Django: Use UV to install Django into your project:

    Terminal window
    uv add django

  4. Create Django Project: Once Django is installed, create a new Django project with this command:

    Terminal window
    uv run django-admin startproject myproject .

  5. Run Development Server: Start up the development server, so you can see your Django app running:

    Terminal window
    uv run python manage.py runserver

  6. Access the Application: Open your web browser and go to http://localhost:8000/. You should see Django’s default welcome page, which means your project is set up correctly.