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Introducing Ruby/MVC/RoR

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Sumanth krishna
Sumanth krishna

Ruby on Rails is a web application framework that follows the model-view-controller (MVC) architecture. It is built on Ruby, an object-oriented programming language. Rails emphasizes conventions over configuration, making common tasks simpler. The framework includes features like ActiveRecord for object-relational mapping, generators for scaffolding code, and plugins for extending functionality. Many large companies use Rails for their web applications.

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Introducing Ruby MVC Framework Ruby on Rails
TAG Cloud Java Ruby PHP Object oriented ActiveRecord python Ruby on Rails Rails J2EE Hibernate Framework MVC RadRails Aptana NetBeans Struts IDE Architecture ActionPack gems Webserver Testing plugins OpenSource Helpers webrick Methods
Do we need??? Another Language... Another Framework... A new design pattern... Wide range of new tools... ... ... ...
 
So let's dive in...
Ruby is... An interpreted language - a.k.a dynamic, scripting - e.g., perl Modules allow addition of behaviors to a class Object Oriented Single inheritance High level - Good support for system calls, regex and CGI Relies heavily on convention for syntax
Ruby is... All classes derived from Object i ncluding Class (like Java) but there are no primitives (not like Java at all) Ruby uses single-inheritance Mixins give you the power of multiple inheritance without the headaches Modules allow addition of behaviors to a class Things like ‘=‘ and ‘+’ that you might think are operators are actually methods (like Smalltalk) Variables are not typed Automatic memory allocation and garbage collection
Traditional Applications Browser directly accesses page. - Do not offer centralized control - No separation of content/style - Difficult to maintain
MVC Applications Browser accesses a “controller” - Centralizes control - Clean separation of content/style - More involved to produce - Easier to maintain and expand
MVC MVC is an Architectural Design Pattern Separates a web application into three different modules. Model | View | Controller
MVC Advantages Separation of interests. Model centralizes business logic. View centralizes display logic. Controller centralizes application flow. Clean separation of content/style. Improved decoupling. Easier testing. Allow multiple people to work on different parts.
RAILS & MVC Rails in an MVC framework ”… Rails is such a framework that tries to remove the complexity and drudgery of MVC, while still allowing you to realize all the benefits.” - DHH (David Heinemeier Hansson)
Model - ActiveRecord ActiveRecord is a design pattern. (Martin Fowler) Object wraps a row in the database. Encapsulates data access. Contains business logic. Handles relationships. Handles validation.
View - ActionView Renders the view. Both .rhtml and .rxml files. Provides master layouts. Uses ERb (embedded ruby) for templating and control.
Controller – ActionController Controls application flow. Controls which view to use. Makes data available as instance variables @var Contains several actions/defs Controls rendering and redirection.
What it looks like?
Walk through...
Folder Structure
RAILS in 10 points Don’t Repeat Yourself Convention Over Configuration Model View Controller Agile Development Configuring DB ActiveRecord (Built-in ORM support)‏ CRUD – operations Generators Migrations Plugins
Worth diving. Isn't it?
Who's using...
Applications...
References... http://wiki.rubyonrails.org http://rubyonrails.org http://www.workingwithrails.com http:// www.37signals.com ... ...
Thanks! Sumanth Krishna. A www.sumanthkrishna.com [email_address]

More Related Content

Introducing Ruby/MVC/RoR

  • 1. Introducing Ruby MVC Framework Ruby on Rails
  • 2. TAG Cloud Java Ruby PHP Object oriented ActiveRecord python Ruby on Rails Rails J2EE Hibernate Framework MVC RadRails Aptana NetBeans Struts IDE Architecture ActionPack gems Webserver Testing plugins OpenSource Helpers webrick Methods
  • 3. Do we need??? Another Language... Another Framework... A new design pattern... Wide range of new tools... ... ... ...
  • 4.  
  • 6. Ruby is... An interpreted language - a.k.a dynamic, scripting - e.g., perl Modules allow addition of behaviors to a class Object Oriented Single inheritance High level - Good support for system calls, regex and CGI Relies heavily on convention for syntax
  • 7. Ruby is... All classes derived from Object i ncluding Class (like Java) but there are no primitives (not like Java at all) Ruby uses single-inheritance Mixins give you the power of multiple inheritance without the headaches Modules allow addition of behaviors to a class Things like ‘=‘ and ‘+’ that you might think are operators are actually methods (like Smalltalk) Variables are not typed Automatic memory allocation and garbage collection
  • 8. Traditional Applications Browser directly accesses page. - Do not offer centralized control - No separation of content/style - Difficult to maintain
  • 9. MVC Applications Browser accesses a “controller” - Centralizes control - Clean separation of content/style - More involved to produce - Easier to maintain and expand
  • 10. MVC MVC is an Architectural Design Pattern Separates a web application into three different modules. Model | View | Controller
  • 11. MVC Advantages Separation of interests. Model centralizes business logic. View centralizes display logic. Controller centralizes application flow. Clean separation of content/style. Improved decoupling. Easier testing. Allow multiple people to work on different parts.
  • 12. RAILS & MVC Rails in an MVC framework ”… Rails is such a framework that tries to remove the complexity and drudgery of MVC, while still allowing you to realize all the benefits.” - DHH (David Heinemeier Hansson)
  • 13. Model - ActiveRecord ActiveRecord is a design pattern. (Martin Fowler) Object wraps a row in the database. Encapsulates data access. Contains business logic. Handles relationships. Handles validation.
  • 14. View - ActionView Renders the view. Both .rhtml and .rxml files. Provides master layouts. Uses ERb (embedded ruby) for templating and control.
  • 15. Controller – ActionController Controls application flow. Controls which view to use. Makes data available as instance variables @var Contains several actions/defs Controls rendering and redirection.
  • 16. What it looks like?
  • 19. RAILS in 10 points Don’t Repeat Yourself Convention Over Configuration Model View Controller Agile Development Configuring DB ActiveRecord (Built-in ORM support)‏ CRUD – operations Generators Migrations Plugins
  • 23. References... http://wiki.rubyonrails.org http://rubyonrails.org http://www.workingwithrails.com http:// www.37signals.com ... ...
  • 24. Thanks! Sumanth Krishna. A www.sumanthkrishna.com [email_address]