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Clojure Web Development Essentials

You're reading from   Clojure Web Development Essentials Develop your own web application with the effective use of the Clojure programming language

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Product type Paperback
Published in Feb 2015
Publisher
ISBN-13 9781784392222
Length 232 pages
Edition 1st Edition
Languages
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Author (1):
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Ryan Baldwin Ryan Baldwin
Author Profile Icon Ryan Baldwin
Ryan Baldwin
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Table of Contents (14) Chapters Close

Preface 1. Getting Started with Luminus 2. Ring and the Ring Server FREE CHAPTER 3. Logging 4. URL Routing and Template Rendering 5. Handling Form Input 6. Testing in Clojure 7. Getting Started with the Database 8. Reading Data from the Database 9. Database Transactions 10. Sessions and Cookies 11. Environment Configuration and Deployment A. Using Korma – a Clojure DSL for SQL Index

Validating the form POST

We might write perfect code but, unfortunately, our users are mere mortals and thus are prone to giving us cruddy data by mistake. If you recall, in Chapter 1, Getting Started with Luminus, we used the Luminus template to generate the hipstr application, which includes the lib-noir library for us. One of the helper namespaces provided by lib-noir is a noir.validation namespace.

The noir.validation namespace

The noir.validation namespace provides methods to validate data in a variety of ways. It includes functions to check whether or not an input is nil, is an e-mail, is of a certain minimum length, and so on. This is excellent because I hate writing validation code, and I'm sure you do, too.

However, while noir.validation has a lot of functions that can be used to validate data, its actual validation framework makes some unfortunate assumptions as to how it will be used. It is also stateful, which makes it difficult to test and, frankly, is pretty unnecessary...

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