Rubyonrails 090715105949-phpapp01

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This document provides an overview of the Ruby on Rails web application framework. It discusses that Rails is a full-stack framework that follows the model-view-controller pattern and uses Ruby as its programming language. It was created by David Heinemeier Hansson in 2004 and uses conventions like separating data, presentation, and control logic into the model, view, and controller layers respectively. The document also provides high-level information on Rails' object-relational mapping, database persistence, and conventions over configuration approach.

Ruby On Rails
Building Web Applications Is Fun!

Rails is a full-stack framework for developing
database-backed web applications according
to the Model-View-Control pattern.
– www.rubyonrails.org - Ruby on Rails official site
What is Ruby on Rails?

• Written in Ruby
• Creator of Ruby on Rails
– David Heinemeier Hansson
• Birth: July 2004
• Latest: 2.1.1: 4 September 2008
• Based on SmallTalk, Perl, Lisp
• Not strongly typed
RoR Trivia

Dynamic, high level, interpreted, pure object-
orientated language.
“Ruby is designed to make programmers happy”
Yukihiro Matsumoto aka Matz
What is Ruby?

• Creator of Ruby
– Yukihiro Matsumoto aka Matz
• Birthday: 24 February 1993
• Originated in Japan and Rapidly
Gaining Mindshare in US and Europe.
Ruby Trivia

• Separate data (model) from user interface (view)
• Model
– data access and business logic
– independent of the view and controller
• View
– data presentation and user interaction
– read-only access to the model
• Controller
– handling events
– operating on model and view
Design Principles
Model - View - Controller

Design Principles
Database Persistence
• OR mapping
– Active Record design pattern
• migrations
– incremental schema management
• multiple db adapters
– MySQL, PostgreSQL, SQLite, SQL Server, IBM DB2,
Informix, Oracle

Design Principles
Full Stack Framework
• MVC suite
• built-in webserver
• default db adapter
• AJAX, web services, email
• test framework
• plugins

• fixed directory structure
– everything has its place – source files, libs, plugins,
database files, documentation etc
• file naming conventions
– e.g. camel case class name, underscore file name
• database naming conventions
– table names, primary and foreign keys
• standard configuration files
– e.g. database connections, environment setting definitions
(development, production, test)
Design Principles
Convention over Configuration

• reusing code
– e.g. view elements
• reusing data
– e.g. no need to declare table field names – can be read
from the database
• making each line of code work harder
– e.g. mini languages for specific domains
• object-relational mapping
• metaprogramming
– dynamically created methods
Design Principles
DRY - Don’t Repeat Yourself

• Object Relational Mapping
– “ActiveRecord”
• Less Database “glue” Code
• Logging for Performance Checking
MVC Architecture
Model - ActiveRecord

MVC Architecture
Model : Rules
• Table Names
– Plurals
• Attribute Names
– id for primary key in table
– table_id for foreign key in other table

MVC Architecture
View - ActionView
• multiple template types
– oldest and basic: erb (embedded ruby), similar to e.g. jsp
– remote javascript templates
– xml templates
• easy reuse of view elements
– file inclusion – layouts, templates, partials
– multiple standard "helpers" – common html element
generators (e.g. form elements, paginators)
• easy AJAX integration

MVC Architecture
Controller : ActionController
• Method name matches view folder
– users_controller.rb works for
/views/users/***.rhtml
– called “actions”
– all view’s methods will sit there
• Ability to
– CRUD
– Flash
– Redirect

RoR vs. Java
Comparison of Rails and J2EE stacks

Usage & Support
Web Servers
• Lighttpd
• Mongrel
• WEBrick
• Apache

Usage & Support
RoR Databases
• Mysql
• Oracle
• Postgre Sql
• SqlLite

Ruby on Rails is a full-stack web application framework built on Ruby that follows the model-view-controller architectural pattern. It features conventions over configuration, including a default directory structure, naming conventions, and configuration files. The framework emphasizes separation of concerns with the model handling data and business logic, the view handling presentation and user interaction, and the controller handling events and coordinating the model and view.

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Talk at the final event of Data Fusion Dynamics: A Collaborative UK-Saudi Initiative in Cybersecurity and Artificial Intelligence funded by the British Council UK-Saudi Challenge Fund 2024, Cardiff Metropolitan University, 29th April 2025 https://alandix.com/academic/talks/CMet2025-AI-Changes-Everything/ Is AI just another technology, or does it fundamentally change the way we live and think? Every technology has a direct impact with micro-ethical consequences, some good, some bad. However more profound are the ways in which some technologies reshape the very fabric of society with macro-ethical impacts. The invention of the stirrup revolutionised mounted combat, but as a side effect gave rise to the feudal system, which still shapes politics today. The internal combustion engine offers personal freedom and creates pollution, but has also transformed the nature of urban planning and international trade. When we look at AI the micro-ethical issues, such as bias, are most obvious, but the macro-ethical challenges may be greater. At a micro-ethical level AI has the potential to deepen social, ethnic and gender bias, issues I have warned about since the early 1990s! It is also being used increasingly on the battlefield. However, it also offers amazing opportunities in health and educations, as the recent Nobel prizes for the developers of AlphaFold illustrate. More radically, the need to encode ethics acts as a mirror to surface essential ethical problems and conflicts. At the macro-ethical level, by the early 2000s digital technology had already begun to undermine sovereignty (e.g. gambling), market economics (through network effects and emergent monopolies), and the very meaning of money. Modern AI is the child of big data, big computation and ultimately big business, intensifying the inherent tendency of digital technology to concentrate power. AI is already unravelling the fundamentals of the social, political and economic world around us, but this is a world that needs radical reimagining to overcome the global environmental and human challenges that confront us. Our challenge is whether to let the threads fall as they may, or to use them to weave a better future.

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tecnologias de las primeras civilizaciones.pdffjgm517

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Rubyonrails 090715105949-phpapp01

1. Ruby On Rails Building Web Applications Is Fun!

2. Rails is a full-stack framework for developing database-backed web applications according to the Model-View-Control pattern. – www.rubyonrails.org - Ruby on Rails official site What is Ruby on Rails?

3. • Written in Ruby • Creator of Ruby on Rails – David Heinemeier Hansson • Birth: July 2004 • Latest: 2.1.1: 4 September 2008 • Based on SmallTalk, Perl, Lisp • Not strongly typed RoR Trivia

4. Dynamic, high level, interpreted, pure object- orientated language. “Ruby is designed to make programmers happy” Yukihiro Matsumoto aka Matz What is Ruby?

5. • Creator of Ruby – Yukihiro Matsumoto aka Matz • Birthday: 24 February 1993 • Originated in Japan and Rapidly Gaining Mindshare in US and Europe. Ruby Trivia

7. Design Principles

8. • Separate data (model) from user interface (view) • Model – data access and business logic – independent of the view and controller • View – data presentation and user interaction – read-only access to the model • Controller – handling events – operating on model and view Design Principles Model - View - Controller

9. Design Principles Database Persistence • OR mapping – Active Record design pattern • migrations – incremental schema management • multiple db adapters – MySQL, PostgreSQL, SQLite, SQL Server, IBM DB2, Informix, Oracle

10. Design Principles Full Stack Framework • MVC suite • built-in webserver • default db adapter • AJAX, web services, email • test framework • plugins

11. • fixed directory structure – everything has its place – source files, libs, plugins, database files, documentation etc • file naming conventions – e.g. camel case class name, underscore file name • database naming conventions – table names, primary and foreign keys • standard configuration files – e.g. database connections, environment setting definitions (development, production, test) Design Principles Convention over Configuration

12. • reusing code – e.g. view elements • reusing data – e.g. no need to declare table field names – can be read from the database • making each line of code work harder – e.g. mini languages for specific domains • object-relational mapping • metaprogramming – dynamically created methods Design Principles DRY - Don’t Repeat Yourself

13. MVC Architecture

14. MVC Architecture MVC Architecture

15. • Object Relational Mapping – “ActiveRecord” • Less Database “glue” Code • Logging for Performance Checking MVC Architecture Model - ActiveRecord

16. MVC Architecture Model : Rules • Table Names – Plurals • Attribute Names – id for primary key in table – table_id for foreign key in other table

17. MVC Architecture View - ActionView • multiple template types – oldest and basic: erb (embedded ruby), similar to e.g. jsp – remote javascript templates – xml templates • easy reuse of view elements – file inclusion – layouts, templates, partials – multiple standard "helpers" – common html element generators (e.g. form elements, paginators) • easy AJAX integration

18. MVC Architecture Controller : ActionController • Method name matches view folder – users_controller.rb works for /views/users/***.rhtml – called “actions” – all view’s methods will sit there • Ability to – CRUD – Flash – Redirect

19. Some Comparisons

20. RoR vs. Java Comparison of Rails and J2EE stacks

21. Usage & Support

22. Usage & Support Web Servers • Lighttpd • Mongrel • WEBrick • Apache

23. Usage & Support RoR Databases • Mysql • Oracle • Postgre Sql • SqlLite

24. Usage & Support Websites on Rails

25. Usage & Support Companies Using Rails

26. Thank You.!!