Ruby on Rails

Ruby on Rails ::The New Gem of Web Development

Web application framework Dynamically typed programming language Create or manage web applications which manipulate relational database from a web-based user interface Ruby on Rails

Ruby ?? Pure object-oriented programming language Everything is an object Interpreted scripting language Ruby successfully combines Smalltalk's conceptual elegance, Python's ease of use and learning and Perl's pragmatism. Ruby originated in Japan in 1993 by Yukihiro “matz” Matsumoto, and has started to become popular worldwide in the past few years as more English language books and documentation have become available. Ruby is a metaprogramming language.

What is Rails? Ruby on Rails or just Rails (RoR) An open source Ruby framework Created by David Heinemeier Hansson – DHH Partner The Rails framework was extracted from real-world web applications. All layers in Rails are built to work together so you Don’t Repeat Yourself Everything in Rails (templates to control flow to business logic) is written in Ruby Except for configuration files - YAML

Rails Strengths – It’s all about Productivity Metaprogramming techniques Metaprogramming replaces these two primitive techniques and eliminates their disadvantages. Ruby is one of the best languages for metaprogramming, and Rails uses this capability well. Scaffolding which can quickly construct most of the logic and views needed to do common operations, such as Create, Read, Update and Delete (CRUD).

Rails Strengths – Write Code not Configuration Convention over configuration Naming your data model class with the same name as the corresponding database table ‘ id’ as the primary key name Rails introduces the Active Record framework, which saves objects to the database. The Rails version of Active Record discovers the columns in a database schema and automatically attaches them to your domain objects using metaprogramming. This approach to wrapping database tables is simple, elegant, and powerful.

Rails Strengths – Full-Stack Web Framework Rails implements the model-view-controller (MVC) architecture. The MVC design pattern separates the component parts of an application

For example If there is a class Post, the following code: a = Post.new a.subject = "Example message" a.body = "This is an example message." a.Save INSERT INTO posts (subject, body) VALUES ('Example message', 'This is an example message.');

b = Post.find(:all, :conditions => ['score > 80']) is conceptually equivalent to the following SQL command: SELECT * FROM posts WHERE score > 80;

Rails Strengths Three environments: development, testing, and production Rails embraces test-driven development. Unit testing: testing individual pieces of code Functional testing: testing how individual pieces of code interact Integration testing: testing the whole system Database Support: Oracle, DB2, SQL Server, MySQL, PostgreSQL, SQLite Rails Application Directory Structure

Hello Rails! def sayGoodmorning(name) result = "GoodMorning," + name return result end # Time for tea... puts sayGoodmorning(“Think ahead") puts sayGoodmorning(“Think ahead ")

Hello Rails! Out put is: GoodMorning Think ahead GoodMorning Think ahead

Rail’s two guiding principles: Less software (Don’t Repeat Yourself - DRY) Convention over Configuration (Write code not configuration files) High Productivity and Reduced Development Time Summary

Ruby on Rails

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Ruby on Rails