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

Handling invalid Survey submissions


We've already coded the view that handles survey submission to re-display the page with errors instead of processing the results, if any errors are found in the submitted forms. On the display side, since we are using the as_p convenience method for displaying the form, it will take care of displaying any errors in the forms. So, we should have no code or template changes to make in order to see what happens when an invalid survey is submitted.

What would make a survey submission invalid? The only likely error case for our QuestionVoteForm is if no answer is chosen. What happens, then, if we attempt to submit a survey with missing answers? If we try it, we see that the result is not ideal:

There are at least two problems here. First, the placement of the error messages, above the survey questions, is confusing. It is hard to know what the first error message on the page is referring to, and the second error looks like it is associated with the first question...