Ruby on Rails - Jose M. · PDF fileRuby: The Foundation Rails: The Framework Conclusion Ruby on Rails An Overview J. Dew Department of Computer Science and Engineering University of

Ruby: The FoundationRails: The Framework

Conclusion

Ruby on RailsAn Overview

J. Dew

Department of Computer Science and EngineeringUniversity of South Carolina

April 11, 2007

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Language BasicsCompletely Object OrientedMethods, Classes and Modules

Outline

1 Ruby: The FoundationLanguage BasicsCompletely Object OrientedMethods, Classes and Modules

2 Rails: The FrameworkModel-View-Controller ArchitectureDatabase-centric ProgrammingConvention over Configuration

3 Conclusion

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Language BasicsCompletely Object OrientedMethods, Classes and Modules

Ths Basics

Ruby is . . .A dynamic, open source programming language with a focuson simplicity and productivity. It has an elegant syntax that isnatural to read and easy to write.

http://ruby-lang.org/

Examplesputs "Hello World"

name = getsputs "Hello #{name}"

hash = {:id => 42}hash.has_key? :id

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Language BasicsCompletely Object OrientedMethods, Classes and Modules

Ths Basics

Ruby is . . .A dynamic, open source programming language with a focuson simplicity and productivity. It has an elegant syntax that isnatural to read and easy to write.

http://ruby-lang.org/

Examplesputs "Hello World"

name = getsputs "Hello #{name}"

hash = {:id => 42}hash.has_key? :id

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Language BasicsCompletely Object OrientedMethods, Classes and Modules

Ths Basics

Ruby is . . .A dynamic, open source programming language with a focuson simplicity and productivity. It has an elegant syntax that isnatural to read and easy to write.

http://ruby-lang.org/

Examplesputs "Hello World"

name = getsputs "Hello #{name}"

hash = {:id => 42}hash.has_key? :id

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Language BasicsCompletely Object OrientedMethods, Classes and Modules

Ths Basics

Ruby is . . .A dynamic, open source programming language with a focuson simplicity and productivity. It has an elegant syntax that isnatural to read and easy to write.

http://ruby-lang.org/

Examplesputs "Hello World"

name = getsputs "Hello #{name}"

hash = {:id => 42}hash.has_key? :id

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Language BasicsCompletely Object OrientedMethods, Classes and Modules

Conditionals and Looping

Examples

3.downto(0) do |count|unless count == 0 then

print "#{count}.."else

puts "Blastoff!"end

end

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Language BasicsCompletely Object OrientedMethods, Classes and Modules

Conditionals and Looping

Examples

3.downto(0) do |count|unless count == 0 then

print "#{count}.."else

puts "Blastoff!"end

end

Produces 3..2..1..Blastoff!

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Language BasicsCompletely Object OrientedMethods, Classes and Modules

Outline

1 Ruby: The FoundationLanguage BasicsCompletely Object OrientedMethods, Classes and Modules

2 Rails: The FrameworkModel-View-Controller ArchitectureDatabase-centric ProgrammingConvention over Configuration

3 Conclusion

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Language BasicsCompletely Object OrientedMethods, Classes and Modules

Everythings an Object

Examples42.methods.sort

returns

["%", "&", "*", "**", "+", "+@", "-", "-@","/", "", "[]", "^", "__id__","__send__", "abs", "between?", "ceil", "chr","class", "clone", "coerce", "display", "div","divmod", "downto", "dup", "eql?", "equal?",..."type", "untaint", "upto", "zero?", "|", "~"]

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Language BasicsCompletely Object OrientedMethods, Classes and Modules

Outline

1 Ruby: The FoundationLanguage BasicsCompletely Object OrientedMethods, Classes and Modules

2 Rails: The FrameworkModel-View-Controller ArchitectureDatabase-centric ProgrammingConvention over Configuration

3 Conclusion

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Language BasicsCompletely Object OrientedMethods, Classes and Modules

Methods

Exampledef factorial(n)n == 1 ? 1 : n * factorial(n-1)

end

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Language BasicsCompletely Object OrientedMethods, Classes and Modules

Classes

Exampleclass Client

def Client.most_lucrative(clients)# class method

end

def paid_in_full!# instance method

end

end

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Language BasicsCompletely Object OrientedMethods, Classes and Modules

Modules

Example from Railsmodule ActiveRecord

class Base

def save# create or update a record

end

end

end

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Model-View-Controller ArchitectureDatabase-centric ProgrammingConvention over Configuration

Outline

1 Ruby: The FoundationLanguage BasicsCompletely Object OrientedMethods, Classes and Modules

2 Rails: The FrameworkModel-View-Controller ArchitectureDatabase-centric ProgrammingConvention over Configuration

3 Conclusion

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Model-View-Controller ArchitectureDatabase-centric ProgrammingConvention over Configuration

The Model

ConceptInteracts directly with the RDBMSMaintains the state of the applicationEnforces any rules or validations related to the dataEncapsulated by ActiveRecord in Rails

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Model-View-Controller ArchitectureDatabase-centric ProgrammingConvention over Configuration

The Model

ConceptInteracts directly with the RDBMSMaintains the state of the applicationEnforces any rules or validations related to the dataEncapsulated by ActiveRecord in Rails

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Model-View-Controller ArchitectureDatabase-centric ProgrammingConvention over Configuration

The Model

ConceptInteracts directly with the RDBMSMaintains the state of the applicationEnforces any rules or validations related to the dataEncapsulated by ActiveRecord in Rails

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Model-View-Controller ArchitectureDatabase-centric ProgrammingConvention over Configuration

The Model

ConceptInteracts directly with the RDBMSMaintains the state of the applicationEnforces any rules or validations related to the dataEncapsulated by ActiveRecord in Rails

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Model-View-Controller ArchitectureDatabase-centric ProgrammingConvention over Configuration

The View

ConceptResponsible for generating the UIWhere the HTML, JS, CSS, etc residesMostly printing variables and simple loopsActionView in Rails

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Model-View-Controller ArchitectureDatabase-centric ProgrammingConvention over Configuration

The View

ConceptResponsible for generating the UIWhere the HTML, JS, CSS, etc residesMostly printing variables and simple loopsActionView in Rails

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Model-View-Controller ArchitectureDatabase-centric ProgrammingConvention over Configuration

The View

ConceptResponsible for generating the UIWhere the HTML, JS, CSS, etc residesMostly printing variables and simple loopsActionView in Rails

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Model-View-Controller ArchitectureDatabase-centric ProgrammingConvention over Configuration

The View

ConceptResponsible for generating the UIWhere the HTML, JS, CSS, etc residesMostly printing variables and simple loopsActionView in Rails

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Model-View-Controller ArchitectureDatabase-centric ProgrammingConvention over Configuration

The Controller

ConceptCoordinates between the model(s) and the view(s)Responds to user input and routes accordinglyMost of the application logic goes hereActionController in the Rails framework

J. Dew Ruby on Rails

Ruby: The FoundationRails: The Framework

Conclusion

Model-View-Controller ArchitectureDatabase-centric ProgrammingConvention over Configuration

The Controller

ConceptCoordinates between the model(s) and the view(s)Responds to user input and routes accordinglyMost of the application logic goes hereActionController in the Rails framework

J. Dew Ruby on Rails

Ruby: The FoundationRail