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...

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:

Create a model to save comments
Create a form to submit comments and validate the input data
Add a view that processes the form and saves a new comment to the database
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...

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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.

Who is this book for?

This book is intended for developers with Python knowledge who wish to learn Django in a pragmatic way. Perhaps you are completely new to Django, or you already know a little but you want to get the most out of it. This book will help you to master the most relevant areas of the framework by building practical projects from scratch. You need to have familiarity with programming concepts in order to read this book. Some previous knowledge of HTML and JavaScript is assumed.

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

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Amazon verified reviews

Gabby Jul 10, 2022

swift delivery, book in excellent condition

Amazon Verified review

Paola Vallejo Jun 15, 2022

Es un buen libro para iniciar con el aprendizaje de Django. Abarca diferentes temáticas de forma sencilla.

Amazon Customer Nov 23, 2021

There are many reasons I cannot recommend this book, but I will admit there is more than $50.00 worth of info inside.While there are always coding errors in the books I have purchased, for the most part the code on github has been clean. It is not the case with this this book. The href links in the 1st four chapters all contain double quotes within double quotes. This tells me they didn't even bother to see if the code worked before uploading it. Really poor attention to detail. The first project has you working out of the admin interface, not a best practice, and typing in addresses to move around instead of having links in the base html they supply. Honestly, the first book I read on django had a base template that consisted of 5-lines two of which were links and they taught you how the admin interface is for development not daily use. I know href links are not a big deal, but that's my point; why supply some window dressing and not the glue that puts everything together.

cool_guy Nov 15, 2021

Great book for advanced users. If you are a newbie to Django, it might be hard for you to follow up. Great content.

Naseem Oct 17, 2021

They almost introduced and reached everything very deeply and in great way I wish they added chat in social app but they did almost everything in that app you will make several website to understand Django.

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

What do you get with Print?

Django 3 By Example

Enhancing Your Blog with Advanced Features

Sharing posts by email

Creating forms with Django

Creating a comment system

Building a model

Adding the tagging functionality

Retrieving posts by similarity

Summary

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

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