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Clojure Web Development Essentials

By : Ryan Baldwin
Book Image

Clojure Web Development Essentials

By: Ryan Baldwin

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Clojure Web Development Essentials
Ryan Baldwin
Feb, 2015 | 232 pages
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Table of Contents (19 chapters)
Clojure Web Development Essentials
Clojure Web Development Essentials
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Getting Started with Luminus
Getting Started with Luminus
Leiningen
Dependencies of the app
Luminus file structure
Summary
2
Ring and the Ring Server
Ring and the Ring Server
Understanding Ring in Clojure
What is the Ring Server?
Configuring and running the Ring Server
Summary
3
Logging
Logging
What is Timbre?
Configuring a Timbre appender
Logging with Timbre
Adding an appender
Summary
4
URL Routing and Template Rendering
URL Routing and Template Rendering
What is Compojure?
Creating a Compojure route
What is Selmer?
Creating your first page
Editing the home page
Serving the signup form
Creating the signup page
Summary
5
Handling Form Input
Handling Form Input
Handling the form POST
Validating the form POST
Summary
6
Testing in Clojure
Testing in Clojure
The necessity of testing
Anatomy of a test
Writing and running our first test
Writing a high-level integration test
Summary
7
Getting Started with the Database
Getting Started with the Database
Creating the database schema
Maintaining the database schema
Adding data to the database
Summary
8
Reading Data from the Database
Reading Data from the Database
Creating the catalog
Fetching albums from the database
Creating the recently added route
Rendering the results
An exercise!
Summary
9
Database Transactions
Database Transactions
Introduction to Database Transactions
The ACID properties
Importance of database transactions
Implementing a transaction
Extending the application requirements in brief
Summary
10
Sessions and Cookies
Sessions and Cookies
Sessions
Setting up sessions
Interacting with the session
Restricted routes
Cookies
Extending the application: brief requirements
Summary
11
Environment Configuration and Deployment
Environment Configuration and Deployment
Environ
Setting and resolving environment configurations
Adjusting the database connection
Deploying the hipstr application
Summary
Using Korma – a Clojure DSL for SQL
Using Korma – a Clojure DSL for SQL
Getting Korma
The Quick Korma Crash Course
Port the models from YeSQL to Korma
Index
Index

Creating a Compojure route

Let's do an example that will allow the awful sounding tech jargon to make sense. We will create an extremely basic route, which will simply print out the original request map to the screen. Let's perform the following steps:

  1. Open the home.clj file.

  2. Alter the home-routes defroute such that it looks like this:

    (defroutes home-routes
  (GET "/" [] (home-page))
  (GET "/about" [] (about-page))
  (ANY "/req" request (str request)))

  3. Start the Ring Server if it's not already started.

  4. Navigate to http://localhost:3000/req.

    Note

    It's possible that your Ring Server will be serving off a port other than 3000. Check the output on lein ring server for the serving port if you're unable to connect to the URL listed in step 4.

You should see something like this:

Using defroutes

Before we dive too much into the anatomy of the routes, we should speak briefly about what defroutes is. The defroutes macro packages up all of the routes and creates one big Ring handler out of them. Of course...

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