Rails as a Pattern Language
•
1 like•1,893 views
In this talk, Cory Foy covers what is it that makes Rails more than a collection of Design Patterns and instead a Pattern Language
Recommended
More Related Content
More from Cory Foy
More from Cory Foy (20)
Recently uploaded
Recently uploaded (20)
Rails as a Pattern Language
- 1. coryfoy.com Rails as a Pattern Language Cory Foy @cory_foy foyc@coryfoy.com http://coryfoy.com Friday, August 9, 13
- 2. coryfoy.com Not to be confused with Ruby (programming language). - Wikipedia Friday, August 9, 13
- 4. coryfoy.com “[Rails is] not a blank slate equally tolerant of every kind of expression. On the contrary, it trades that flexibility for the convenience of ‘what most people need most of the time to do most things’” - David Heinmeier Hansson - The Rails 3 Way Friday, August 9, 13
- 5. coryfoy.com Ruby on Rails, often simply Rails, is an open source web application framework which runs on the Ruby programming language. It is a full-stack framework: it allows creating pages and applications that gather information from the web server, talk to or query the database, and render templates out of the box. As a result, Rails features a routing system that is independent of the web server. Friday, August 9, 13
- 6. coryfoy.com Ruby on Rails emphasizes the use of well- known software engineering patterns and principles, such as active record pattern, convention over configuration (CoC), don't repeat yourself (DRY), and model-view- controller (MVC). Friday, August 9, 13
- 9. coryfoy.com “The elements of this language are entities called patterns. Each pattern describes a problem that occurs over and over again in our environment, and then describes the core of the solution to that problem, in such a way that you can use this solution a million times over, without ever doing it the same way twice.” Christopher Alexander - “A Pattern Language” Friday, August 9, 13
- 10. coryfoy.com “Each pattern is a rule which describes what you have to do to generate the entity which it defines” Christopher Alexander - “The Timeless Way of Building” Friday, August 9, 13
- 11. coryfoy.com • Characteristics • Knowledge to Build the System • Whether it is essential to solve a problem Friday, August 9, 13
- 12. coryfoy.com Pattern Name Intent Motivation Consequences Implementation Elements of a pattern Friday, August 9, 13
- 14. coryfoy.com “A pattern language is a system which allows its users to create an infinite variety of those three dimensional combinations of patterns which we call buildings, gardens, towns.” Christopher Alexander - “The Timeless Way of Building” Friday, August 9, 13
- 15. coryfoy.com • North South Axis • West Facing Entrance Down the Slope • Two Floors • Hay Loft at the Back • Bedrooms in Front • Garden to the South • Pitched Roof • Half-Hipped End • Balcony Toward the Garden • Carved Ornaments Farmhouse in Bernese Oberland Friday, August 9, 13
- 16. coryfoy.com Natural vs Pattern Language Natural Language Pattern Language Words Patterns Rules of grammar and meaning which give connections Patterns which specify connections between patterns Sentences Buildings and Places Friday, August 9, 13
- 17. coryfoy.com “Advocates of this design approach claim that ordinary people can use it to successfully solve very large, complex design problems.” Wikipedia - “Design Patterns” Friday, August 9, 13
- 18. coryfoy.com Design a Building Friday, August 9, 13
- 20. coryfoy.com Design a Web Application Friday, August 9, 13
- 22. coryfoy.comMapper Active Record Template View Front Controller Model-View Controller Single Table Inheritance Friday, August 9, 13
- 24. coryfoy.com REST Routing Validations Controllers Action View Action Mailer Active Record Authentication Session Management Background Processing Caching and Performance Extending Rails with Plugins Friday, August 9, 13
- 27. Cory Foy (@cory_foy) foyc@coryfoy.com http://coryfoy.com Friday, August 9, 13
- 28. Cory Foy (@cory_foy) foyc@coryfoy.com http://coryfoy.com Friday, August 9, 13