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Django 3 By Example, - Third Edition
Django 3 By Example, - Third Edition

Django 3 By Example,: Build powerful and reliable Python web applications from scratch, Third Edition

By Antonio Melé
$38.99 $9.99
Book Mar 2020 568 pages 3rd Edition
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Publication date : Mar 31, 2020
Length 568 pages
Edition : 3rd Edition
Language : English
ISBN-13 : 9781838981952
Category :
Concepts :
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Django 3 By Example, - Third Edition

Enhancing Your Blog with Advanced Features

In the preceding chapter, you created a basic blog application. Next, you will turn your application into a fully functional blog with the advanced functionalities that many blogs feature nowadays. You will implement the following features in your blog:

  • Sharing posts via email: When readers like an article, they might want to share it with somebody else. You will implement the functionality to share posts via email.
  • Adding comments to a post: Many people want to allow their audience to comment on posts and create discussions. You will let your readers add comments to your blog posts.
  • Tagging posts: Tags allow you to categorize content in a non-hierarchical manner, using simple keywords. You will implement a tagging system, which is a very popular feature for blogs.
  • Recommending similar posts: Once you have a classification method in place, such as a tagging system, you can use it to provide content recommendations...

Sharing posts by email

First, let's allow users to share posts by sending them via email. Take a minute to think about how you could use views, URLs, and templates to create this functionality using what you learned in the preceding chapter. In order to allow your users to share posts via email, you will need to do the following things:

  • Create a form for users to fill in their name, their email, the email recipient, and optional comments
  • Create a view in the views.py file that handles the posted data and sends the email
  • Add a URL pattern for the new view in the urls.py file of the blog application
  • Create a template to display the form

Creating forms with Django

Let's start by building the form to share posts. Django has a built-in forms framework that allows you to create forms in an easy manner. The forms framework makes it simple to define the fields of your form, specify how they have to be displayed, and indicate how they...

Creating a comment system

You will build a comment system wherein users will be able to comment on posts. To build the comment system, you need to do the following:

  1. Create a model to save comments
  2. Create a form to submit comments and validate the input data
  3. Add a view that processes the form and saves a new comment to the database
  4. Edit the post detail template to display the list of comments and the form to add a new comment

Building a model

First, let's build a model to store comments. 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()
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField...

Adding the tagging functionality

After implementing your comment system, you need to create a way to tag your posts. You will do this by integrating a third-party Django tagging application into your project. django-taggit is a reusable application that primarily offers you a Tag model and a manager to easily add tags to any model. You can take a look at its source code at https://github.com/jazzband/django-taggit.

First, you need to install django-taggit via pip by running the following command:

pip install django_taggit==1.2.0

Then, open the settings.py file of the mysite project and add taggit to your INSTALLED_APPS setting, as follows:

INSTALLED_APPS = [
    # ...
    'blog.apps.BlogConfig',
    'taggit',
]

Open the models.py file of your blog application and add the TaggableManager manager provided by django-taggit to the Post model using the following code:

from taggit.managers import TaggableManager
class Post(models.Model...

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...

Summary

In this chapter, you learned how to work with Django forms and model forms. You created a system to share your site's content by email and created a comment system for your blog. You added tagging to your blog posts, integrating a reusable application, and built complex QuerySets to retrieve objects by similarity.

In the next chapter, you will learn how to create custom template tags and filters. You will also build a custom sitemap and feed for your blog posts, and implement the full text search functionality for your posts.

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Key benefits

  • Learn Django 3 by building real-world web applications from scratch in Python, using coding best practices
  • Integrate other technologies into your application with clear, step-by-step explanations and comprehensive example code
  • Implement advanced functionalities like a full-text search engine, a user activity stream, or a recommendation engine
  • Add real-time features with Django Channels and WebSockets

Description

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.

What you will learn

Build real-world web applications Learn Django essentials, including models, views, ORM, templates, URLs, forms, and authentication Implement advanced features such as custom model fields, custom template tags, cache, middleware, localization, and more Create complex functionalities, such as AJAX interactions, social authentication, a full-text search engine, a payment system, a CMS, a RESTful API, and more Integrate other technologies, including Redis, Celery, RabbitMQ, PostgreSQL, and Channels, into your projects Deploy Django projects in production using NGINX, uWSGI, and Daphne

What do you get with eBook?

Product feature icon Instant access to your Digital eBook purchase
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
Buy Now

Product Details


Publication date : Mar 31, 2020
Length 568 pages
Edition : 3rd Edition
Language : English
ISBN-13 : 9781838981952
Category :
Concepts :

Table of Contents

17 Chapters
Preface Chevron down icon Chevron up icon
1. Building a Blog Application Chevron down icon Chevron up icon
2. Enhancing Your Blog with Advanced Features Chevron down icon Chevron up icon
3. Extending Your Blog Application Chevron down icon Chevron up icon
4. Building a Social Website Chevron down icon Chevron up icon
5. Sharing Content on Your Website Chevron down icon Chevron up icon
6. Tracking User Actions Chevron down icon Chevron up icon
7. Building an Online Shop Chevron down icon Chevron up icon
8. Managing Payments and Orders Chevron down icon Chevron up icon
9. Extending Your Shop Chevron down icon Chevron up icon
10. Building an E-Learning Platform Chevron down icon Chevron up icon
11. Rendering and Caching Content Chevron down icon Chevron up icon
12. Building an API Chevron down icon Chevron up icon
13. Building a Chat Server Chevron down icon Chevron up icon
14. Going Live Chevron down icon Chevron up icon
15. Other Books You May Enjoy Chevron down icon Chevron up icon
16. Index Chevron down icon Chevron up icon

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