Book Image

Web Development with Django - Second Edition

By : Ben Shaw, Saurabh Badhwar, Chris Guest, Bharath Chandra K S
4.7 (3)
Book Image

Web Development with Django - Second Edition

4.7 (3)
By: Ben Shaw, Saurabh Badhwar, Chris Guest, Bharath Chandra K S

Overview of this book

Do you want to develop reliable and secure applications that stand out from the crowd without spending hours on boilerplate code? You’ve made the right choice trusting the Django framework, and this book will tell you why. 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 will take you through all the essential concepts and help you explore its power to build real-world applications using Python. Throughout the book, you’ll get the grips with the major features of Django 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 presented as exercises and activities, allowing you to challenge yourself in an enjoyable and attainable way. As you advance, you'll acquire 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. You’ll cover everyday tasks that are part of the development cycle of a real-world web application. By the end of this Django book, you'll have the skills and confidence to creatively develop and deploy your own projects.
Table of Contents (19 chapters)

String filters

In Exercise 11.01, Creating a custom template filter, we built a custom filter, which allowed us to split a provided string with a separator and generate a list from it. This filter can take any kind of variable and split it as a list of values based on a delimiter provided. But what if we wanted to restrict our filter to work only with strings and not with any other type of values, such as integers?

We can use the stringfilter decorator provided by Django’s template library to develop filters that work only on strings. When the stringfilter decorator is used to register a Python method as a filter in Django, the framework ensures that the value being passed to the filter is converted to a string before the filter executes. This reduces any potential issues that may arise when non-string values are passed to our filter.

The steps to implement a string filter are similar to the ones we followed for building a custom filter with some minor changes.

Remember...