Book Image

Django 1.1 Testing and Debugging

Book Image

Django 1.1 Testing and Debugging

Overview of this book

Bugs are a time consuming burden during software development. Django's built-in test framework and debugging support help lessen this burden. This book will teach you quick and efficient techniques for using Django and Python tools to eradicate bugs and ensure your Django application works correctly. This book will walk you step by step through development of a complete sample Django application. You will learn how best to test and debug models, views, URL configuration, templates, and template tags. This book will help you integrate with and make use of the rich external environment of test and debugging tools for Python and Django applications. The book starts with a basic overview of testing. It will highlight areas to look out for while testing. You will learn about different kinds of tests available, and the pros and cons of each, and also details of test extensions provided by Django that simplify the task of testing Django applications. You will see an illustration of how external tools that provide even more sophisticated testing features can be integrated into Django's framework. On the debugging front, the book illustrates how to interpret the extensive debugging information provided by Django's debug error pages, and how to utilize logging and other external tools to learn what code is doing.
Table of Contents (17 chapters)
Django 1.1 Testing and Debugging
Credits
About the Author
About the Reviewer
Preface
Index

Chapter 7. When the Wheels Fall Off: Understanding a Django Debug Page

Just about the last thing you want when your code is running in production is for it to encounter an error so severe that the only message that can be returned to the client is "We're sorry, the server has encountered an error, please try again later." During development, however, these server error situations are among the best of the bad outcomes. They generally indicate an exception has been raised, and when that happens there is a wealth of information available to figure out what has gone wrong. When DEBUG is on, this information is returned, in the form of a Django debug page, as the response to the request that caused the error. In this chapter, we will learn how to understand and make use of the information provided by a Django debug page.

Specifically, in this chapter we will:

  • Continue development of the example survey application, making some typical mistakes along the way

  • See how these mistakes manifest themselves...