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Django 2 by Example
Django 2 by Example

Django 2 by Example: Build powerful and reliable Python web applications from scratch

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Django 2 by Example

Enhancing Your Blog with Advanced Features

In the preceding chapter, you created a basic blog application. Now, you will turn your application into a fully functional blog with advanced features, such as sharing posts by email, adding comments, tagging posts, and retrieving posts by similarity. In this chapter, you will learn the following topics:

  • Sending emails with Django
  • Creating forms and handling them in views
  • Creating forms from models
  • Integrating third-party applications
  • Building complex QuerySets

Sharing posts by email

First, we will allow users to share posts by sending them emails. Take a short time to think how you would use views, URLs, and templates to create this functionality using what you have learned in the preceding chapter. Now, check what you need in order to allow your users to send posts by email. You will need to do the following things:

  • Create a form for users to fill in their name and 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...

Creating a comment system

Now, we will build a comment system for the blog, wherein the users will be able to comment on posts. To build the comment system, you will need to do the following steps:

  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 the 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

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...

Adding the tagging functionality

After implementing your comment system, you will create a way to tag our posts. You will do this by integrating a third-party Django tagging application in our project. The django-taggit module 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/alex/django-taggit.

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

pip install django_taggit==0.22.2

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...

Retrieving posts by similarity

Now that we have implemented tagging for our blog posts, we can do many interesting things with them. Using tags, we can classify our blog posts very well. Posts about similar topics will have several tags in common. We will build a functionality to display similar posts by the number of tags they share. In this way, when a user reads a post, we can suggest to them that they read other related posts.

In order to retrieve similar posts for a specific post, we 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 case of two or more posts with the same number of tags, recommend the most recent post
  6. Limit the query to the number...

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 blog posts.

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Key benefits

  • Learn Django 2 by building real-world web applications from scratch
  • Develop powerful web applications quickly using the best coding practices
  • Integrate other technologies into your application with clear, step-by-step explanations and comprehensive example code

Description

If you want to learn the entire process of developing professional web applications with Django 2, then this book is for you. You will walk through the creation of four professional Django 2 projects, teaching you how to solve common problems and implement best practices. You will learn how to build a blog application, a social image bookmarking website, an online shop and an e-learning platform. The book will teach you how to enhance your applications with AJAX, create RESTful APIs and set up a production environment for your Django 2 projects. The book walks you through the creation of real-world applications, solving common problems, and implementing best practices. By the end of this book, you will have a deep understanding of Django 2 and how to build advanced web applications.

Who is this book for?

If you are a web developer who wants to see how to build professional sites with Django 2, this book is for. You will need a basic knowledge of Python, HTML, and JavaScript, but you don't need to have worked with Django before.

What you will learn

  • Build practical real-world web applications with Django 2
  • Use Django 2 with other technologies such as Redis and Celery
  • Develop pluggable Django 2 applications
  • Create advanced features, optimize your code, and use the cache framework
  • Add internationalization to your Django 2 projects
  • Enhance the user experience using JavaScript and AJAX
  • Add social features to your projects
  • Build RESTful APIs for your applications
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Publication date, Length, Edition, Language, ISBN-13
Publication date : May 31, 2018
Length: 526 pages
Edition : 1st
Language : English
ISBN-13 : 9781788472487
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Table of Contents

14 Chapters
Building a Blog Application Chevron down icon Chevron up icon
Enhancing Your Blog with Advanced Features Chevron down icon Chevron up icon
Extending Your Blog Application Chevron down icon Chevron up icon
Building a Social Website Chevron down icon Chevron up icon
Sharing Content in Your Website Chevron down icon Chevron up icon
Tracking User Actions Chevron down icon Chevron up icon
Building an Online Shop Chevron down icon Chevron up icon
Managing Payments and Orders Chevron down icon Chevron up icon
Extending Your Shop Chevron down icon Chevron up icon
Building an E-Learning Platform Chevron down icon Chevron up icon
Rendering and Caching Content Chevron down icon Chevron up icon
Building an API Chevron down icon Chevron up icon
Going Live Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

Top Reviews
Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.3
(21 Ratings)
5 star 66.7%
4 star 14.3%
3 star 4.8%
2 star 14.3%
1 star 0%
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L Mulheron Sep 18, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
One of my favorite Django books. Not a Django beginner book in my opinion but perfect for dev's at the Junior level and up.Only half way through though but loving it =)
Amazon Verified review Amazon
Amazon Customer Jun 12, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Very good so far
Amazon Verified review Amazon
Justin O'Brien Dec 15, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is the first time I have taken the time to write a review on Amazon. I felt inclined to do this because of the many programming books I have read and tutorials I have watched, this book deserves praise. If you don't know Python, don't buy this book. If you are not at all familiar with Django, I recommend watching tutorials on Youtube before diving into this book. However, if you feel you know the basics of Django (can get a small project working/understand the basics of models, views, and templates) this book will take you to the next level. It has you build project after project (blog, social network, e-commerce site, etc). The author lays out the code and walks you through it, but not every line of code is described sufficiently( not a shot at the author, that would've been a tedious task and quite a large book). So you will often find yourself having to look up what a certain method does or how something works. If you stick to this and read the documentation or check stackoverflow when you don't understand something, you will learn incredible things. Progress through the projects slowly, write lots of comments, make sure you understand what is going on (for the most part) before moving on to the next part of the book and you will truly learn to build with Django. (Note: I haven't even finished the book)
Amazon Verified review Amazon
draw2soon Nov 23, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
If you like to learn by example than this is the book for you!
Amazon Verified review Amazon
Francesco T. Aug 18, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Il libro é pratico, mostra esempi reali di applicazioni che puoi sviluppare in Python, pezzo dopo pezzo, dai concetti più semplici fino ai più complessi, come sviluppare REST API e pubblicare le proprie app in server con nginx.
Amazon Verified review Amazon
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