Ruby on Rails: a brief introduction
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Introduction to Ruby on Rails for the Linguaggi e Ambienti Multimediali course at Politecnico di Torino, academic year 2011/2012
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Ruby on Rails: a brief introduction
- 1. Ruby on Rails: a brief introduction Luigi De Russis Dipartimento di Automatica e Informatica Politecnico di Torino luigi.derussis@polito.it
- 2. What is Ruby on Rails? A web framework ◦ created in 2003 ◦ open-source ◦ for the Ruby programming language ◦ based on the MVC (Model-View-Controller) pattern the CoC (Convention over Configuration) principle the DRY (Don’t Repeat Yourself) principle Website: http://rubyonrails.org/ 2
- 3. Ruby on Rails Provides many tools to quickly develop common feature, such as: ◦ interfacing to DBMS systems ◦ data management and validation ◦ creation of user interfaces ◦ creation of pages according to the MVC pattern ◦ etc. Built-in support for Ajax 3
- 4. Is Ruby on Rails used in “real- world” application? Yes, for example by… ◦ Twitter ◦ Yellow Pages ◦ Github ◦ Hulu ◦ Groupon ◦ Ruby website ◦ SUSE studio ◦ Urban Dictionary ◦ … 4
- 5. What is Ruby? A programming language ◦ released in Japan in 1995 ◦ inspired by other programming language Perl, Smalltalk, Eiffel, Ada, and Lisp ◦ open-source ◦ interpreted ◦ object-oriented Website: http://www.ruby-lang.org 5
- 6. Ruby vs. Java (I) Like Java, in Ruby: ◦ memory is managed for you via a garbage collector ◦ objects are strongly typed ◦ there are public, private, and protected methods ◦ there are embedded doc tools (RDoc) Linguaggi e Ambienti Multimediali A 6
- 7. Ruby vs. Java (II) Unlike Java, in Ruby: ◦ you use the end keyword after defining things like classes, instead of having to put braces around blocks of code ◦ require instead of import ◦ all member variables are private ◦ nil instead of null ◦ there is no casting ◦ everything is an object 7
- 8. About variables and methods… Variables and constants ◦ variables start with lowercase letters ◦ constants start with uppercase letters ◦ typically “_” is used among terms No static type checking Methods ◦ must start with lowercase letters ◦ are defined by the keyword def… end ◦ return statement is optional they implicit return the last evaluated expression 8
- 9. Let’s try! 9
- 10. Some resources… http://rubyonrails.org/ http://www.ruby-lang.org/ http://api.rubyonrails.org/ http://guides.rubyonrails.org/ http://ruby.railstutorial.org/ruby-on-rails- tutorial-book 10