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Creating Web Services with Ruby on Rails Robert Thew Internet and Web Systems II.

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Presentation on theme: "Creating Web Services with Ruby on Rails Robert Thew Internet and Web Systems II."— Presentation transcript:

1 Creating Web Services with Ruby on Rails Robert Thew Internet and Web Systems II

2 What is Ruby? Ruby is a language created in Japan in 1995 by Yukihiro Matsumoto It’s an Object-Oriented language that also has elements of Functional languages

3 Why Create Ruby? Matsumoto wanted to create a language that combined all his favorite features into one language

4 What Are Ruby’s Features? Completely Object-Oriented Can do Functional as well as Imperative programming Clean, simple and consistent syntax

5 Basics of Ruby Demo using irb

6 Ruby on Rails A Model-View-Controller Web Framework for Ruby developed in 2004 by David Heinemeier Hansson Guiding principle is Convention over Configuration Very little boilerplate code Small classes with short methods Allows for rapid development

7 Installation Ruby and RoR come installed on MacPros Can be downloaded and installed from: – ruby-lang.org – rubyonrails.org MySQL can be downloaded from mysql.com

8 Building an Application Run the rails command to create a new application framework Go into the new directory and edit the database config file Add user and password for development entry $rails new biblio $cd biblio $vi config/database.yml

9 Create Database Create an empty development database instance $rake db:create

10 What Is Rake? Rake is Ruby’s version of Make Rakefiles use ruby syntax – so no whitespace problems Rails applications come with rakefiles for running database commands and for doing unit tests

11 Test Application Rails uses WEBrick, a ruby library that provides a basic HTTP server >rails s => Booting WEBrick => Rails application starting in development on => Call with -d to detach => Ctrl-C to shutdown server

12 Generate MVC Files Rails comes with a generator that will create database migrations, model, view, controller, and test files >rails generate scaffold Article title:string author:string url:string abstract:text

13 Database Migration Migration classes are used to create and modify tables >rake db:migrate

14 Model and Controller Code Note how short all the methods are Convention over Configuration means code can be kept simple No need for explicit getters and setters in the Model

15 RESTful Architecture All the URLs will follow the same pattern for CRUD (Create Read Update Delete)operations REST (Representational State Transfer) is a simpler and consistent alternative to SOAP

16 URL Patterns These URLs are routed to their respective controller methods. GET /articles GET /articles/new POST /articles GET /articles/1 GET /articles/1.xml GET /articles/1/edit PUT /articles/1 DELETE /articles/1

17 Test Application >rails s >rails c

18 Rails Tools Git – Distributed versioning system Capistrano – For scripting deployments RubyGems – Package dependency manager RVM – Run multiple versions on one system Heroku – Ruby Cloud Platform as a Service


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