Book Image

Web Development with Django

By : Ben Shaw, Saurabh Badhwar, Andrew Bird, Bharath Chandra K S, Chris Guest
Book Image

Web Development with Django

By: Ben Shaw, Saurabh Badhwar, Andrew Bird, Bharath Chandra K S, Chris Guest

Overview of this book

Do you want to develop reliable and secure applications which stand out from the crowd, rather than spending hours on boilerplate code? Then the Django framework is where you should begin. Often referred to as a 'batteries included' web development framework, Django comes with all the core features needed to build a standalone application. Web Development with Django takes this philosophy and equips you with the knowledge and confidence to build real-world applications using Python. Starting with the essential concepts of Django, you'll cover its major features by building a website called Bookr – a repository for book reviews. This end-to-end case study is split into a series of bitesize projects that are presented as exercises and activities, allowing you to challenge yourself in an enjoyable and attainable way. As you progress, you'll learn various practical skills, including how to serve static files to add CSS, JavaScript, and images to your application, how to implement forms to accept user input, and how to manage sessions to ensure a reliable user experience. Throughout this book, you'll cover key daily tasks that are part of the development cycle of a real-world web application. By the end of this book, you'll have the skills and confidence to creatively tackle your own ambitious projects with Django.
Table of Contents (17 chapters)
Preface

Custom Template Filters

Django supplies a lot of useful filters that we can use in our templates while we are working on our projects. But what if someone wants to format a specific piece of text and render it with different fonts? Or say if someone wants to translate an error code to a user-friendly error message based on the mapping of the error code in the backend. In these cases, predefined filters do not suffice, and we would like to write our own filter that we can reuse across the project.

Luckily, Django supplies an easy-to-use API that we can use to write custom filters. This API provides developers with some useful decorator functions that can be used to quickly register a Python function as a custom template filter. Once a Python function is registered as a custom filter, a developer can start using the function in templates.

An instance of this template library method is required to access these filters. This instance can be created by instantiating the Library...