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Ruby on Rails : First Mile
Ruby is a dynamic, reflective, and general-purpose object-oriented programming language designed by Yukihiro Matsumoto, inspired by languages like Perl and Smalltalk. It supports multiple programming paradigms and has led to the development of Ruby on Rails, a web application framework that emphasizes rapid development and agile methodologies. The document further explores key Ruby concepts, the MVC paradigm, and practical tools for database management within Rails applications.
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Ruby on Rails : First Mile
- 1. “I always knewthat one day Smalltalk would replace Java. I just didn’t know it would be called Ruby.” – Kent Beck, MountainWest RubyConf 2009
- 4. o dynamic, reflective, general purpose object-oriented programming language o designed by Yukihiro "Matz" Matsumoto. It was influenced primarily by Perl, Smalltalk, Eiffel, and Lisp. o Ruby supports multiple programming paradigms, including functional, object oriented, imperative and reflective. It also has a dynamic type system and automatic memory management; it is therefore similar in varying respects to Python, Perl, Lisp, Dylan, Pike, and CLU. o alternative implementations of the Ruby language, including YARV, JRuby, Rubinius, IronRuby, MacRuby, and HotRuby, each of which takes a different approach, with IronRuby, JRuby and MacRuby providing just-in-time compilation and MacRuby also providing ahead-of-time compilation
- 5. o open source web application framework for the Ruby programming language. o It is intended to be used with an Agile development methodology that is used by web developers for rapid development o Ruby on Rails was extracted by David Heinemeier Hansson from his work on Basecamp, a project management tool by 37signals (now a web application company o David Hansson first released Rails as open source in July 2004
- 6. o By helpingyou know what the code in your application is doing o By helping you do more in, and with, your Rails applications that you can if you limit yourself to the readily available Rails idioms and techniques o By allowing you to familiarize yourself with the Rails source code, which in turn enables you to participate in discussions about Rails and perhaps submit bugs and patches. o By giving you powerful tool for administrative and organization tasks connected with your application.
- 7. Ruby Concepts Ruby forRails Rails Concepts Hello RoR First RoR App Further reading
- 8. Ruby Concepts Ruby forRails Rails Concepts Hello RoR First RoR App Further reading
- 9. • Thinking in Ruby • IRB • Hello World
- 10. Ruby Concepts Ruby forRails Rails Concepts Hello RoR First RoR App Further reading
- 11. Ruby Concepts Ruby forRails Rails Concepts Hello RoR First RoR App Further reading
- 12. • Ruby Constructs • Importance of Ruby • Extending Rails and other frameworks
- 13. Ruby Concepts Ruby forRails Rails Concepts Hello RoR First RoR App Further reading
- 14. Ruby Concepts Ruby forRails Rails Concepts Hello RoR First RoR App Further reading
- 15. • MVC • Server • Convention over Configuration • Structure of a Rails App • DRY(Don’t Repeat Yourself) • Migrations • Gems • Routes • And other topics
- 16. o Standsfor Model-View-Controller o Model is responsible for maintaining the state of an application o View layer provides the user interface of an application
- 17. o WEBrick o Mongrel o > ruby script/server o > gem server
- 18. o All you need is common sense and it works like magic! o Comparison with C# , Java o No Connection String
- 19. o Another example of convention over configuration o Advantages o > ruby script/console
- 20. Implications of DRYin RoR ; migrations , seeds etc.
- 21. 1. Migrations are a convenient way for you to alter your database in a structured and organized manner. You could edit fragments of SQL by hand but you would then be responsible for telling other developers that they need to go and run them. You’d also have to keep track of which changes need to be run against the production machines next time you deploy. 2. db/schema.rb 3. Timestamp 4. Use of migrations in case of faulty code generation
- 22. class CreateProducts <ActiveRecord::Migration def self.up create_table :products do |t| t.string :name t.text :description t.timestamps end end def self.down drop_table :products end end
- 23. > rake db:migrate VERSION=<timestamp> >ruby script/generate migration Add<Field>To<ContollerNam e> fieldname:type
- 24. o routes.rb o map.root
- 25. 1. > gem install <gem-name> 2. > gem install <gem-name> --local 3. > gem update –system 4. > gem server 5. From setup.rb … >ruby setup.rb 6. From gemspec .. >gem build example.gemspec 7. Get gemspecs / .gems form Rubyforge.com or github 8. Rake gem:install
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- 31. o Gourab Mitra gourab5139014@gmail.com http://gourabmitra.co.cc o Sujeet Kumar sujeet0s1@gmail.com http://bit.ly/aEFKTT