Introduction to Ruby on Rails

Aug 5, 2016Download as pptx, pdf1 like138 views

Ruby on Rails is a web application framework that uses the Ruby programming language. It provides tools and automates tasks to help organize code for web applications. Ruby was created in 1993 and Rails in 2004. Rails uses the model-view-controller (MVC) pattern and allows creating a functional web application quickly through features like scaffolding, migrations, and validations. The document provides an introduction and overview of Ruby on Rails including its history and key concepts.

Ruby on Rails
Intro to Ruby on Rails
Ruby Hellug – 4th Jan 2014
Eleni Chourouzidou (eleni@webspirit.gr)

Framework
● Organizes code
● Provides tools
● Automates tasks

Ruby's clean & elegant syntax
> 2.times { print 'We love Ruby!' }
> We love Ruby!We love Ruby! => 5

Brief timeline
● 1993: Beginning of Ruby
● 1995: Ruby's first release
● 1999: Ruby's english documentation
● 2004: Creation of Ruby on Rails
● Today, Ruby version 2.1, RoR version 4.0.2

Create new app & file structure
> rails new blog
> cd blog
> rails server
Already a functional
application!!

Migrations
db/migrate/20140101225451_add_author_to_posts.rb

Routes & RESTful routing
config/routes.rb

What to see next
● Codeschool Free Course: Rails for Zombies
(www.railsforzombies.org)
●Tutorial: Creating a simple ToDo application
(www.arubystory.blogspot.gr)
● Book: Rails 4 in Action (Publication 28 Mar 2014)

Database Configuration
1) Gemfile
Declare database
adapter, for example:
− gem 'mysql2'
− gem 'pg'
− gem 'sqlite3'
2) configdatabase.yml

Views
● Adding a link to a
project
● form_for
● render

Controller
● Actions
● Strong Params
● Callbacks
● Before filters

Environments
● Development: lots of logs, convenient reload of
changed files, notifications of errors
● Test: system in isolation so you have
repeatable results
● Production: performance, users should be kept
away from errors

Seeds
1) Add the code to populate the posts table of the Post model1) Add the code to populate the posts table of the Post model
2) Populate posts by running:

This document provides an introduction to Ruby on Rails, including a brief history of Ruby and Rails, how Rails organizes and automates code, a timeline of Ruby and Rails releases, examples of Rails' clean syntax and scaffolding functionality, and an overview of MVC and migrations. It also recommends resources for learning more about Rails and provides instructions for installing Rails and generating a sample blog application.

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Introduction to Ruby on Rails

1. Ruby on Rails Intro to Ruby on Rails Ruby Hellug – 4th Jan 2014 Eleni Chourouzidou (eleni@webspirit.gr)

2. Framework ● Organizes code ● Provides tools ● Automates tasks

3. Brief History ● Ruby ● Ruby on Rails

4. Ruby's clean & elegant syntax > 2.times { print 'We love Ruby!' } > We love Ruby!We love Ruby! => 5

5. Brief timeline ● 1993: Beginning of Ruby ● 1995: Ruby's first release ● 1999: Ruby's english documentation ● 2004: Creation of Ruby on Rails ● Today, Ruby version 2.1, RoR version 4.0.2

6. Create new app & file structure > rails new blog > cd blog > rails server Already a functional application!!

7. Scaffold: Adds fast functionality

8. MVC

9. Migrations db/migrate/20140101225451_add_author_to_posts.rb

10. Model Validations

11. Views

12. Controller

13. Routes & RESTful routing config/routes.rb

14. Routes & RESTful routing

15. What to see next ● Codeschool Free Course: Rails for Zombies (www.railsforzombies.org) ●Tutorial: Creating a simple ToDo application (www.arubystory.blogspot.gr) ● Book: Rails 4 in Action (Publication 28 Mar 2014)

16. Thank you! Any Question?

18. Database Configuration 1) Gemfile Declare database adapter, for example: − gem 'mysql2' − gem 'pg' − gem 'sqlite3' 2) configdatabase.yml

19. CRUD & ActiveRecord

20. Views ● Adding a link to a project ● form_for ● render

21. Controller ● Actions ● Strong Params ● Callbacks ● Before filters

22. Gemfile, Bundler

24. Model, Relations & Validations

25. Environments ● Development: lots of logs, convenient reload of changed files, notifications of errors ● Test: system in isolation so you have repeatable results ● Production: performance, users should be kept away from errors

26. Database Schema

27. Seeds 1) Add the code to populate the posts table of the Post model1) Add the code to populate the posts table of the Post model 2) Populate posts by running:

Editor's Notes

#4: Ruby creator Yukihiro Matsumoto First release on 1995, 1999 engish documentation, 2004 Ruby on Rails He took the best out of his favorite languages: Perl, Smalltalk, Eiffel, Ada, and Lisp He wanted simplicity, elegance and especially programmer's happiness Ruby is OO, dynamic, open-source, expressive To proof some of the above statements:5.times { print 'We love Ruby!' }5 is an object, to which we can call an iteration method (times) and in a block we tell it what to do. Rails is a framework, that is to say a set of standard needs when you build a web application.
#10: Database schema evolves constantly in a rails project: you add a table, rename a column etc A migration represent a change we want to make in the database It's not SQL but a Ruby DSL, which makes it much more handy It's Database Independent, eg. we can change from postgre to mysql at any time
#14: Resource: collection of similar objects, such as posts, people or animals. You can create, read, update and destroy items for a resource and these operations are referred to as CRUD operations.
#19: One of the first decisions you make when you start developping an application is selecting a database. Rails is very flexible you can set db config in 2 steps
#23: Gems are library, that is to say code ready for a specific functionality like user authentication, file upload
#26: Rails recognizes that your needs are different when writing code, testing code, and running the code in production.
#27: After running rake db:migration a file is created/updated: db/schema.rb It holds the current state of the db schema:What tablesWhat columns and column typesIndexes
#28: We can have initial content for our application which we can write only once (we can edit it at any time) and share with collaborators