Book Image

Django 3 By Example - Third Edition

By : Antonio Melé
Book Image

Django 3 By Example - Third Edition

By: Antonio Melé

Overview of this book

If you want to learn the entire process of developing professional web applications with Python and Django, then this book is for you. In the process of building four professional Django projects, you will learn about Django 3 features, how to solve common web development problems, how to implement best practices, and how to successfully deploy your applications. In this book, you will build a blog application, a social image bookmarking website, an online shop, and an e-learning platform. Step-by-step guidance will teach you how to integrate popular technologies, enhance your applications with AJAX, create RESTful APIs, and set up a production environment for your Django projects. By the end of this book, you will have mastered Django 3 by building advanced web applications.

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Table of Contents (17 chapters)
Preface
Preface
Who this book is for
What this book covers
Get the most out of this book
Get in touch
1
Building a Blog Application
Building a Blog Application
Installing Django
Creating your first project
Designing the blog data schema
Creating an administration site for models
Working with QuerySets and managers
Building list and detail views
Creating templates for your views
Adding pagination
Using class-based views
Summary
Free Chapter
2
Enhancing Your Blog with Advanced Features
Enhancing Your Blog with Advanced Features
Sharing posts by email
Creating a comment system
Adding the tagging functionality
Retrieving posts by similarity
Summary
3
Extending Your Blog Application
Extending Your Blog Application
Creating custom template tags and filters
Adding a sitemap to your site
Creating feeds for your blog posts
Adding full-text search to your blog
Summary
4
Building a Social Website
Building a Social Website
Creating a social website project
Using the Django authentication framework
User registration and user profiles
Building a custom authentication backend
Adding social authentication to your site
Summary
5
Sharing Content on Your Website
Sharing Content on Your Website
Creating an image bookmarking website
Posting content from other websites
Creating a detail view for images
Creating image thumbnails using easy-thumbnails
Adding AJAX actions with jQuery
Creating custom decorators for your views
Adding AJAX pagination to your list views
Summary
6
Tracking User Actions
Tracking User Actions
Building a follow system
Building a generic activity stream application
Using signals for denormalizing counts
Using Redis for storing item views
Summary
7
Building an Online Shop
Building an Online Shop
Creating an online shop project
Building a shopping cart
Registering customer orders
Launching asynchronous tasks with Celery
Summary
8
Managing Payments and Orders
Managing Payments and Orders
Integrating a payment gateway
Exporting orders to CSV files
Extending the administration site with custom views
Generating PDF invoices dynamically
Summary
9
Extending Your Shop
Extending Your Shop
Creating a coupon system
Adding internationalization and localization
Building a recommendation engine
Summary
10
Building an E-Learning Platform
Building an E-Learning Platform
Setting up the e-learning project
Building the course models
Creating models for diverse content
Creating a CMS
Managing course modules and their contents
Summary
11
Rendering and Caching Content
Rendering and Caching Content
Displaying courses
Adding student registration
Accessing the course contents
Using the cache framework
Summary
12
Building an API
Building an API
Building a RESTful API
Summary
13
Building a Chat Server
Building a Chat Server
Creating a chat application
Real-time Django with Channels
Installing Channels
Writing a consumer
Routing
Implementing the WebSocket client
Enabling a channel layer
Modifying the consumer to be fully asynchronous
Integrating the chat application with existing views
Summary
14
Going Live
Going Live
Creating a production environment
Implementing custom management commands
Summary
15
Other Books You May Enjoy
Other Books You May Enjoy
16
Index
Index

Retrieving posts by similarity

Now that you have implemented tagging for your blog posts, you can do many interesting things with tags. Tags allow you to categorize posts in a non-hierarchical manner. Posts about similar topics will have several tags in common. You will build a functionality to display similar posts by the number of tags they share. In this way, when a user reads a post, you can suggest to them that they read other related posts.

In order to retrieve similar posts for a specific post, you need to perform the following steps:

  1. Retrieve all tags for the current post
  2. Get all posts that are tagged with any of those tags
  3. Exclude the current post from that list to avoid recommending the same post
  4. Order the results by the number of tags shared with the current post
  5. In the case of two or more posts with the same number of tags, recommend the most recent post
  6. Limit the query to the number of posts you want to recommend

These...

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