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BCR Ruby on Rails - Boston Computing Review : Ruby on Rails

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Text of BCR Ruby on Rails - Boston Computing Review : Ruby on Rails

  • BCR : Ruby on Rails

    an introduction

    more at http://www.rubyonrails.org/

  • Background / Agenda

    Upcoming web projectFearsWelcome RubyGetting Onto RailsFramework, MVC, Databases, Application Servers and moreDeploying RORWhere to look Next
  • Considerations

    .NETExperienceJ2EEEnterprise AcceptancePHPProven, knowledgebaseRuby on RailsDevelopment Speed, native MVC *and a little fun*
  • Fears

    PHP vs RORStabilityLack of Public Knowledge BaseShark AttackMissing Intelisense
  • Ruby

    Based on SmallTalk, Perl, LispObject OrientedNot strongly typedBasics http://www.fincher.org/tips/Languages/Ruby/FUN? :)
  • Rails Framework

    Power Through Rules and Best PracticeMVCAssumes a DatabaseObject Relational MappingForms Handling Been there done thatParametersLink BuildingScaffolding
  • MVC

    Nothing New, 1973ModelYour Data and Data RulesViewInterfaceControllerTraffic Director
  • MVC in ROR

    View

    ShowUser.rhtml

    User Name

    Controller

    Users_controller.rb

    def ShowUser

    @user = User.find(params[:id])

    end

    def other

    end

    def another

    end

    Model

    user.rb

    class User < ActiveRecord::Base

    #relations

    has_many:posts

    #start validation here

    validates_presence_of :email,

    :username, :password

    validates_uniqueness_of :email,

    :username

    End

  • Model

    Object Relational MappingActiveRecordLess Database glue Code *sigh of relief!*Worst Case Scenario Optimizations Possible with manual SQLLogging for Performance Checking
  • Model : Rules

    Table NamesPluralsAttribute Namesid for primary key in tabletable_id for foreign key in other tableAbility to run joins via objects!Article.User.UsernameLegacy Options Available
  • Model : Sample from Text

  • Model : Sample from Text

  • Model : Sample from Text

  • Model : Code Sample

    class User < ActiveRecord::Base

    #relations

    has_many:posts

    #related to rankings

    has_many:ranks

    has_many:critiques

    #start validation here

    validates_format_of(:email,

    :with => /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i,

    :message=>"has an invalid format")

    validates_presence_of :email, :username, :password

    validates_uniqueness_of :email, :username

    #authentication for user

    def self.authenticate(username, password)

    user = User.find(:first, :conditions => ["username = ?", username])

    if user

    if user.password != password

    user = nil

    end

    end

    user

    end

    end

  • Model : DB Logging

    Processing SearchController#list (for 127.0.0.1 at 2006-11-18 22:51:36) [POST]

    Session ID: 667befe9190e1c686f537e8dcdcd731d

    Parameters: {"commit"=>"search", "action"=>"list", "controller"=>"search", "query"=>{"query"=>"test"}}

    [4;36;1mArticle Load (0.000000)[0m [0;1mselect a.* from articles a where (lower(a.title) like '%querytest%' or lower(a.articlebody) like '%querytest%' or lower(a.description) like '%querytest%') order by a.created_on desc[0m

    Rendering within layouts/search

    Rendering search/list

    Completed in 0.03100 (32 reqs/sec) | Rendering: 0.01500 (48%) | DB: 0.00000 (0%) | 200 OK [http://localhost/search/list]

  • Controller

    Method name matches view folderusers_controller.rb works for /views/users/***.rhtmlcalled actionsall views methods will sit thereAbility toCRUDFlashRedirect
  • Controller : ActiveRecord Create

    def create

    @user = User.new(params[:user])

    if @user.save

    flash[:notice] = 'User was successfully created.'

    redirect_to :action => 'list'

    else

    render :action => 'new'

    end

    end

  • Controller : Flash

    def create

    @user = User.new(params[:user])

    if @user.save

    flash[:notice] = 'User was successfully created.'

    redirect_to :action => 'list'

    else

    render :action => 'new'

    end

    end

  • Controller : Redirect

    def create

    @user = User.new(params[:user])

    if @user.save

    flash[:notice] = 'User was successfully created.'

    redirect_to :action => 'list'

    else

    render :action => 'new'

    end

    end

  • Controller : Getting Data

    Request Data (POST / GET)Params hashModelsSession dataetc
  • Views

    Show the dataTemplates (layouts)Use objects from controllerNavigate guide into controller / actionForms
  • Views : Showing Data

    Inline Ruby (similar to JSP)

    :

    'edit', :id => @user %> |

    'list' %>

  • Views : Layouts

    Inherit by default for controllerException in controller

    #set the layout

    layout "articles", :except => [:signin, :richtest]

  • View : Layout Sample

    Admin:

  • View : Object from Controller

    :

    'edit', :id => @user %> |

    'list' %>

  • View : Navigation

    :

    'edit', :id => @user %> |

    'list' %>

  • View : Forms

    Native validation based on modelPartials to separate code from main view view _formname.rhtml

    Quick Account Signup

    'create' %>

    'formname' %>

  • View : Forms

    Firstname

    Lastname

    Email

    Username

    Password


  • Scaffolding

    FastFamous video (blog in 15 min) http://media.rubyonrails.org/video/rails_take2_with_sound.movDynamic view from DBGreat starting placeNeeds more work
  • Deploying

    Time consuming but straightforwardUnix / Linux hostsTextDriveLightHTTPD serverMySQL
  • Miscellaneous / Thoughts

    Logging Framework Ready to UseInterpreted (no waiting for compile)Once you get the hang of Ruby a lot of fun to quickly developIn the weeds is still in the weeds
  • Where to Look Next

    OReilly Onlamp - Great Starting Placehttp://www.onlamp.com/pub/a/onlamp/2005/01/20/rails.htmlhttp://www.onlamp.com/pub/a/onlamp/2005/03/03/rails.htmlBooks from 37 SignalsAgile Web Development With RailsRails Recipieshttp://www.rubyonrails.org/docs
  • On the CD

    IDE RadRailsBuilt on EclipseDatabase MySQL 5.0 with GUI ToolsEver wonder why the SQL Server 2005 GUI looks like it does? :)OReilly Onlamp ArticlesRuby on Rails Cheat SheetFamous Blog VideoThis Powerpoint Deck

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