Ruby on rails 101 - Peter Marklund's Home

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Ruby on Rails 101
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Agenda Monday Tuesday Wednesday Thu
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Kung-Fu? “Ruby o
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Rails background • Jason Fried +
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Rails Philosophy and Strengths •
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MVC Request Cycle 1. A request is m
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Directory Structure app controllers
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Useful Rake Tasks • db:migrate
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Environments • Every environment
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• raise @object.inspect Debugging
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“I always thought Smalltalk would
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Everything in Ruby
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Defining a class and Instantiating
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Getter- and Settter Methods class P
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Variable/Method Ambiguity Gotcha cl
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Defining Class Methods class Person
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Naming Conventions • MyClass •
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assignment • a, b = b, a # swappi
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modules # Mixins - instead of multi
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Everything is an object • 2 + 2 i
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Introspection andreas = Person.new(
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String class “ruby”.upcase +
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hash class h = {:lang => ‘<strong
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More About methods • Arbitrary nu
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Structs Rating = Struct.new(:name,
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Iterators: while, until, and for. K
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locks, closures, and proc objects d
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common string operations “ “.bl
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egular expressions puts “matches
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invoking external programs system(
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Ruby on the Comman
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Core Classes are Also Open class In
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Using the VCR vcr = VCR.new vcr.gsu
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eval, binding def evaluate_code(cod
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class Person def add_method(method)
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Object Space ObjectSpace.each_objec
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System Hooks: Class#inherited class
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Migrations 75
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Migrations: Managing Tables and Col
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Two Special Columns created_at and
Page 81 and 82: Let’s Bring Sexy Back # Note: thi
Page 83 and 84: Fundamentals • One database table
Page 85 and 86: CRUD • Create: create, new • Re
Page 87 and 88: if user.save # All is ok else # Cou
Page 89 and 90: Column/Attribute Data Types MySQL <
Page 91 and 92: Default Attribute Values class User
Page 93 and 94: find • User.find(:first) # => Use
Page 95 and 96: Power Find with Additional Attribut
Page 97 and 98: Like Clauses # Like this User.find(
Page 99 and 100: RecordNotFound Exception User.exist
Page 101 and 102: order = Order.find(12) order.name =
Page 103 and 104: Locking # SELECT * FROM accounts WH
Page 105 and 106: Destroy Class Methods def destroy(i
Page 107 and 108: Calculations Person.minimum(‘age
Page 109 and 110: Virtual Attributes # Virtual attrib
Page 111 and 112: Composite Attributes class Name att
Page 113 and 114: Chad Fowler Says ActiveRecord is an
Page 115 and 116: Controllers • Controllers are <st
Page 117 and 118: equest.env SERVER_NAME = localhost
Page 119 and 120: Render examples • render :text =>
Page 121 and 122: Cookies • A hash stored by the br
Page 123 and 124: Configuring Sessions • session :o
Page 125 and 126: Best Practice • Don’t put SQL a
Page 127 and 128: What is ActionView? • ActionView
Page 129 and 130: Template Environment • Templates
Page 131: Builder Template Example: RSS xml.i
Page 135 and 136: Passing Variables to Partials • C
Page 137 and 138: Layouts • Layouts are templates u
Page 139 and 140: Dynamic Layout Selection class Blog
Page 141 and 142: Helpers • Helpers are Rub
Page 143 and 144: url_helper.rb url_for({:controller
Page 145 and 146: Testing 145
Page 147 and 148: Test::Unit:TestCase • Test::Unit
Page 149 and 150: Unit Test Example require File.dirn
Page 151 and 152: Test Data with Fixtures • Fixture
Page 153 and 154: Assertions • assert(actual, comme
Page 155 and 156: Functional Test Example require Fil
Page 157 and 158: assert_select assert_select “p.wa
Page 159 and 160: Integration Test Example class Trac
Page 161 and 162: Running Tests • rake - runs all t
Page 163 and 164: Mocha and Stubba Examples client =
Page 165 and 166: cov • rcov is a Ruby</str
Page 167 and 168: AJAX and RJS Testing • When you d
Page 169 and 170: HTML Validation and Link Checking
Page 171 and 172: Test Case Specific Fixtures • Sha
Page 173 and 174: RSpec Examples require File.join(Fi
Page 175 and 176: class User has_one :weblog end clas
Page 177 and 178: elongs_to class LineItem < ActiveRe
Page 179 and 180: Methods added by has_many Firm#clie
Page 181 and 182: has_and_belongs_to_many # Requires
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Join Model with Conditions class Ar
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Polymorphic Associations create_tab
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Single Table Inheritance: Class Hie
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Acts As List class Parent < ActiveR
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Acts As Tree create_table :categori
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Eager Loading: From N+1 to 1 Query
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Association Callbacks class Project
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Validation • Validations are rule
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Validation Errors class Person < Ac
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Validation Macros: Usage class User
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Callback Sequence create update des
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efore_save Example class User < Act
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Observers class AuditObserver < Act
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ActionView Forms 209
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form_for - Wrapping Model Objects
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Processing Multiple Object Form Sub
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Select Boxes "name") form.collec
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date_helper.rb distance_of_time_in_
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form_tag_helper.rb - Working with N
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There is a Better Way: attachment_f
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Styling Error Messages Customize th
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Filters • Typically used to imple
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Filter Blocks and Classes around_fi
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Verification verify :only => :post_
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Caching • Rails provides three ty
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Cache Storage • Can store fragmen
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Cache Sweeper Declaration class Con
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Fragment Cache Storage • Fragment
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AJAX - Introduction • AJAX stands
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ActionView::Helpers:: PrototypeHelp
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ActionView::Helpers:: JavaScriptMac
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RJS • RJS is a Rails Ruby
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Example: Posting a Comment: The Con
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Options for Remote Links and Forms
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Options for Updating the Page • I
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Example: An AJAX Shopping Cart # In
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Observing Forms "search"}, {:id =>
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Options for Observers :url - url_fo
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The Spinner Icon module Application
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Drag and Drop Example: The Response
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Autocompletion: Example # In text f
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Global AJAX Hooks # In public/javas
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RJS Reuse module ApplicationHelper
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Routing Going Beyond :controller/:a
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Anatomy of a Route • map.route_na
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splat params map.connect ‘*anythi
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Routes in the console rs = ActionCo
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REST 277
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Rails Implementation of REST: CRUD
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map.resources :articles Method URL
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The Accept Header and Extensions #
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Nested Resources # Nested resources
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Consuming REST # You can any HTTP c
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ActionMailer 289
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Creating a Mailer # Creates app/mod
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Sending Email StatisticsMailer.deli
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Attachments class ApplicationMailer
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Unit Testing Mailers def setup Acti
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Plugins Introduction • Plugins is
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Creating Plugins • Generate your
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The Rails Module Inclusion Pattern
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ActiveSupport Introduction ActiveSu
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Enumerations groups = posts.group_b
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20.bytes 20.megabytes 20.seconds 20
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"åäö".size => 6 "åäö".chars.s
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Rails 2.0 • No radical changes, m
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Deployment 315
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FastCGI • FastCGI is a long runni
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Typical Mongrel Architecture • Th
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Mongrel Alternative: LiteSpeed •
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How to Use Capistrano gem install -
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Custom Capistrano Tasks def mongrel
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Capistrano 2.0 • New homepage at
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Gem Dependencies • It’s a good
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Security • SQL Injection - always
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Performance II • Use Memcached an
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Resources 335
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Videos and Audio • PeepCode.com -
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Applications and Frameworks • Ric
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Advice • Go with the flow. Stay o
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