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Clojure Web Development Essentials

Clojure Web Development Essentials

By : Baldwin
4.5 (6)
Buy this Book
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Clojure Web Development Essentials

Clojure Web Development Essentials

4.5 (6)
By: Baldwin
Buy this Book

Overview of this book

This book is for anyone who's worked with Clojure and wants to use it to start developing applications for the Web. Experience or familiarity with basic Clojure syntax is a must, and exposure to Leiningen (or other similar build tools such as Maven) would be helpful.
Table of Contents (14 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Getting Started with Luminus
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1. Getting Started with Luminus
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Leiningen
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Dependencies of the app
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Luminus file structure
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Summary
2
2. Ring and the Ring Server
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2. Ring and the Ring Server
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Understanding Ring in Clojure
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What is the Ring Server?
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Configuring and running the Ring Server
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Summary
3
3. Logging
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3. Logging
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What is Timbre?
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Configuring a Timbre appender
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Logging with Timbre
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Adding an appender
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Summary
4
4. URL Routing and Template Rendering
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4. URL Routing and Template Rendering
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What is Compojure?
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Creating a Compojure route
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What is Selmer?
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Creating your first page
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Editing the home page
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Serving the signup form
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Creating the signup page
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Summary
5
5. Handling Form Input
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5. Handling Form Input
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Handling the form POST
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Validating the form POST
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Summary
6
6. Testing in Clojure
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6. Testing in Clojure
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The necessity of testing
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Anatomy of a test
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Writing and running our first test
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Writing a high-level integration test
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Summary
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7. Getting Started with the Database
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7. Getting Started with the Database
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Creating the database schema
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Maintaining the database schema
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Adding data to the database
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Summary
8
8. Reading Data from the Database
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8. Reading Data from the Database
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Creating the catalog
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Fetching albums from the database
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Creating the recently added route
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Rendering the results
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An exercise!
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Summary
9
9. Database Transactions
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9. Database Transactions
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Introduction to Database Transactions
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The ACID properties
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Importance of database transactions
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Implementing a transaction
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Extending the application requirements in brief
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Summary
10
10. Sessions and Cookies
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10. Sessions and Cookies
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Sessions
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Setting up sessions
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Interacting with the session
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Restricted routes
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Cookies
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Extending the application: brief requirements
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Summary
11
11. Environment Configuration and Deployment
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11. Environment Configuration and Deployment
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Environ
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Setting and resolving environment configurations
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Adjusting the database connection
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Deploying the hipstr application
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Summary
12
A. Using Korma – a Clojure DSL for SQL
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A. Using Korma – a Clojure DSL for SQL
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Getting Korma
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The Quick Korma Crash Course
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Port the models from YeSQL to Korma
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Index
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Index

Setting and resolving environment configurations

We've already alluded to the fact that you can set configuration for environ to consume from either environment variables or from Java system properties. This covers about 100% of real-world usage. However, during development, we can also set environment configuration using the lein-environ plugin (which is also packaged as part of a Luminus-generated application).

When running the development server using lein ring server, the lein-environ plugin will fetch environment configuration from the Leiningen project map, as well as an optional profiles.clj file, and merge the two together into the .lein-env file. This .lein-env file is the first go-to place for environment settings, but only when running the development server.

Note

It is recommended that the profiles.clj and .lein-env files not be committed into your version control, as every developer's environment is likely to be somewhat different. Plus, despite the fact that .lein-env...

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