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  • 8/9/2019 Intro Session on Ruby MVC RoR

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    Introducing

    RubyMVC FrameworkRuby on Rails

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    TAG Cloud Java Ruby PHP Object oriented ActiveRecord

    python Ruby on Rails Rails J2EE Hibernate

    FrameworkMVC RadRails Aptana NetBeans

    Struts IDE Architecture ActionPackgems

    WebserverTesting plugins OpenSource Helpers webrick Methods

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    Do weneed???

    Another Language...

    Another Framework...A new design pattern...Wide range of new tools...

    ...

    ...

    ...

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  • 8/9/2019 Intro Session on Ruby MVC RoR

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    So let's dive in...

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    Rubyis... 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

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    Rubyis... All classes derived from ObjectincludingClass (like Java) butthere are no primitives (not like Java at all)

    Ruby uses single-inheritance

    Mixins give you the power of multiple inheritancewithout the headaches

    Modules allow addition of behaviors to a class

    Things like = and + that you might think are operators areactually methods (like Smalltalk)

    Variables are not typed

    Automatic memory allocation and garbage collection

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    Traditional Applications

    Browser directly accesses page.

    - Do not offer centralized controly - No separation of content/style

    - Difficult to maintain

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    MV

    C ApplicationsBrowser accesses a controller

    - Centralizes control

    - Clean separation of content/style- More involved to produce

    - Easier to maintain and expand

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    MV

    C

    MVC is an Architectural Design PatternSeparates a web application into three different

    modules.

    Model | View | Controller

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    MV

    C AdvantagesSeparation 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 differentparts.

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    RAILS &MV

    C

    Rails in an MVC frameworkRails is such a framework that tries to remove thecomplexity and drudgery of MVC, while stillallowing you to realize all the benefits. - DHH

    (David Heinemeier Hansson)

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    M

    odel - A

    ctiveRecord

    ActiveRecord is a design pattern. (Martin Fowler)

    Object wraps a row in the database.

    Encapsulates data access.

    Contains business logic.

    Handles relationships.

    Handles validation.

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    View - ActionView

    Renders the view.Both .rhtml and .rxml files.

    Provides master layouts.

    Uses ERb (embedded ruby) for templating and

    control.

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    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.

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    Whatit looks like?

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    Walkthrough...

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    FolderStructure

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    RAILSin 10 points

    Dont Repeat Yourself Convention Over Configuration Model View Controller Agile Development Configuring DB ActiveRecord (Built-in ORM support) CRUD operations Generators Migrations Plugins

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    Worth diving. Isn't it?

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    Who's using...

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    Applications...

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    References...

    http://wiki.rubyonrails.org

    http://rubyonrails.orghttp://www.workingwithrails.comhttp://www.37signals.com...

    ...

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    Thanks!Sumanth Krishna. A

    [email protected]


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