Let’s review the request/response cycle of Django with the application we built. The following schema shows a simplified example of how Django processes HTTP requests and generates HTTP responses:

Figure 1.19: The Django request/response cycle

Let’s review the Django request/response process:

A web browser requests a page by its URL, for example, https://domain.com/blog/33/. The web server receives the HTTP request and passes it over to Django.
Django runs through each URL pattern defined in the URL patterns configuration. The framework checks each pattern against the given URL path, in order of appearance, and stops at the first one that matches the requested URL. In this case, the pattern /blog/<id>/ matches the path /blog/33/.
Django imports the view of the matching URL pattern and executes it, passing an instance of the HttpRequest class and the keyword or positional arguments. The view uses the models to retrieve information from...

Management commands used in this chapter

In this chapter we have introduced a variety of Django management commands. You need to get familiar with them, as they will be used often throughout the book. Let’s revisit the commands we have covered in this chapter.

To create the file structure for a new Django project named mysite we have used the following command:

django-admin startproject mysite

To create the file structure for a new Django application named blog:

python manage.py startapp blog

To apply all database migrations:

python manage.py migrate

To create migrations for the models of the blog application:

python manage.py makemigrations blog

To view the SQL statements that will be executed with the first migration of the blog application:

python manage.py sqlmigrate blog 0001

To run the Django development server:

python manage.py runserver

To run the development server specifying host/port and settings file:

python manage.py runserver 127.0.0.1:8001 --settings...

Creating a comment system

We will continue extending our blog application with a comment system that will allow users to comment on posts. To build the comment system, we will need the following:

A comment model to store user comments on posts
A Django form that allows users to submit comments and manages the data validation
A view that processes the form and saves a new comment to the database
A list of comments and the HTML form to add a new comment that can be included in the post detail template

Creating a model for comments

Let’s start by building a model to store user comments on posts.

Open the models.py file of your blog application and add the following code:

class Comment(models.Model):
    post = models.ForeignKey(
        Post,
        on_delete=models.CASCADE,
        related_name='comments'
    )
    name = models.CharField(max_length=80)
    email = models.EmailField()
    body = models.TextField()
...

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Updated with Django 5 features, detailed app planning, improved tooling, and GPT prompts for extending projects
Learn Django essentials, including models, ORM, views, templates, URLs, forms, authentication, signals, and middleware
Integrate JavaScript, PostgreSQL, Redis, Celery, Docker, and Memcached into your applications

Description

If you want to learn Django by doing, this book is for you. Django 5 By Example is the fifth edition of the best-selling franchise that helps you build real-world web apps. This book will walk you through planning and creation, solving common problems, and implementing best practices using a step-by-step approach. You’ll cover a wide range of web application development topics through four different projects: a blog application, a social website, an e-commerce application, and an e-learning platform. Pick up what’s new in Django 5 as you build end-to-end Python web apps, follow detailed project plans, and understand the hows and whys of Django. This is a practical and approachable book that will have you creating web apps quickly.

Who is this book for?

This book is for readers with basic Python programming knowledge and programmers transitioning from other web frameworks who wish to learn Django by doing. If you already use Django, or have in the past, and want to learn best practices and integrate other technologies to scale your applications, then this book is for you too. This book will help you master the most relevant areas of the framework by building practical projects from scratch. Some previous knowledge of HTML and JavaScript is assumed.

What you will learn

Use different modules of the Django framework to solve specific problems
Integrate third-party Django applications into your project
Build complex web applications using Redis, Postgres, Celery/RabbitMQ, and Memcached
Set up a production environment for your projects with Docker Compose
Build a RESTful API with Django Rest Framework (DRF)
Implement advanced functionalities, such as full-text search engines, user activity streams, payment gateways, and recommendation engines
Build real-time asynchronous (ASGI) apps with Django Channels and WebSockets

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Johannes Grib Nov 05, 2024

The book have great technical content but is not usable by a blind person with a screen reader. Although the content is readable, I cannot follow the project code because of the layout not showing the indentation when using nvda, jaws or narrator. Using the source code on github only shows the completed project so I can still not follow the projects step by step. Great book! Johannes

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Atomsk Oct 22, 2024

Great content, very thorough, however this does NOT come with a free digital version like it says. Publisher does not accept Amazon invoices or receipts as proof of purchase so I am guessing this is only for select vendors? Either way, decent book but 4 stars for lying.

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Getulio Silva Oct 05, 2024

I really liked the content of this book and I am benefiting a lot from it for studying this framework.

N/A Sep 13, 2024

From zero to hero :) A very good book.

Damodara Aug 29, 2024

The book contains atleast five projects related to django.

Django 5 By Example: Build powerful and reliable Python web applications from scratch , Fifth Edition

What do you get with Print?

Django 5 By Example

The request/response cycle

Management commands used in this chapter

Summary

Additional resources

Adding pagination

Adding pagination to the post list view

Building class-based views

Why use class-based views

Recommending posts by email

Creating forms with Django

Creating a comment system

Creating a model for comments

Summary

Additional resources

Page 1 of 10

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Django 5 By Example: Build powerful and reliable Python web applications from scratch , Fifth Edition

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