Ruby on rails 101 - Peter Marklund's Home

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<strong>Ruby</strong> 20
“I always thought Smalltalk would beat Java. I just didn’t know it would be called ‘<strong>Ruby</strong>’ when it did” - Kent Beck 21
Page 1 and 2: Ruby on Rails 101
Page 3 and 4: Agenda Monday Tuesday Wednesday Thu
Page 5 and 6: Kung-Fu? “Ruby o
Page 7 and 8: Rails background • Jason Fried +
Page 9 and 10: Rails Philosophy and Strengths •
Page 11 and 12: MVC Request Cycle 1. A request is m
Page 13 and 14: Directory Structure app controllers
Page 15 and 16: Useful Rake Tasks • db:migrate
Page 17 and 18: Environments • Every environment
Page 19: • raise @object.inspect Debugging
Page 23 and 24: Everything in Ruby
Page 25 and 26: Defining a class and Instantiating
Page 27 and 28: Getter- and Settter Methods class P
Page 29 and 30: Variable/Method Ambiguity Gotcha cl
Page 31 and 32: Defining Class Methods class Person
Page 33 and 34: Naming Conventions • MyClass •
Page 35 and 36: assignment • a, b = b, a # swappi
Page 37 and 38: modules # Mixins - instead of multi
Page 39 and 40: Everything is an object • 2 + 2 i
Page 41 and 42: Introspection andreas = Person.new(
Page 43 and 44: String class “ruby”.upcase +
Page 45 and 46: hash class h = {:lang => ‘<strong
Page 47 and 48: More About methods • Arbitrary nu
Page 49 and 50: Structs Rating = Struct.new(:name,
Page 51 and 52: Iterators: while, until, and for. K
Page 53 and 54: locks, closures, and proc objects d
Page 55 and 56: common string operations “ “.bl
Page 57 and 58: egular expressions puts “matches
Page 59 and 60: invoking external programs system(
Page 61 and 62: Ruby on the Comman
Page 63 and 64: Core Classes are Also Open class In
Page 65 and 66: Using the VCR vcr = VCR.new vcr.gsu
Page 67 and 68: eval, binding def evaluate_code(cod
Page 69 and 70: class Person def add_method(method)
Page 71 and 72:
Object Space ObjectSpace.each_objec
Page 73 and 74:
System Hooks: Class#inherited class
Page 75 and 76:
Migrations 75
Page 77 and 78:
Migrations: Managing Tables and Col
Page 79 and 80:
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 and 132:
Builder Template Example: RSS xml.i
Page 133 and 134:
Partials • Partials are templates
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
Page 183 and 184:
Join Model with Conditions class Ar
Page 185 and 186:
Polymorphic Associations create_tab
Page 187 and 188:
Single Table Inheritance: Class Hie
Page 189 and 190:
Acts As List class Parent < ActiveR
Page 191 and 192:
Acts As Tree create_table :categori
Page 193 and 194:
Eager Loading: From N+1 to 1 Query
Page 195 and 196:
Association Callbacks class Project
Page 197 and 198:
Validation • Validations are rule
Page 199 and 200:
Validation Errors class Person < Ac
Page 201 and 202:
Validation Macros: Usage class User
Page 203 and 204:
Callback Sequence create update des
Page 205 and 206:
efore_save Example class User < Act
Page 207 and 208:
Observers class AuditObserver < Act
Page 209 and 210:
ActionView Forms 209
Page 211 and 212:
form_for - Wrapping Model Objects
Page 213 and 214:
Processing Multiple Object Form Sub
Page 215 and 216:
Select Boxes "name") form.collec
Page 217 and 218:
date_helper.rb distance_of_time_in_
Page 219 and 220:
form_tag_helper.rb - Working with N
Page 221 and 222:
There is a Better Way: attachment_f
Page 223 and 224:
Styling Error Messages Customize th
Page 225 and 226:
Filters • Typically used to imple
Page 227 and 228:
Filter Blocks and Classes around_fi
Page 229 and 230:
Verification verify :only => :post_
Page 231 and 232:
Caching • Rails provides three ty
Page 233 and 234:
Cache Storage • Can store fragmen
Page 235 and 236:
Cache Sweeper Declaration class Con
Page 237 and 238:
Fragment Cache Storage • Fragment
Page 239 and 240:
AJAX - Introduction • AJAX stands
Page 241 and 242:
ActionView::Helpers:: PrototypeHelp
Page 243 and 244:
ActionView::Helpers:: JavaScriptMac
Page 245 and 246:
RJS • RJS is a Rails Ruby
Page 247 and 248:
Example: Posting a Comment: The Con
Page 249 and 250:
Options for Remote Links and Forms
Page 251 and 252:
Options for Updating the Page • I
Page 253 and 254:
Example: An AJAX Shopping Cart # In
Page 255 and 256:
Observing Forms "search"}, {:id =>
Page 257 and 258:
Options for Observers :url - url_fo
Page 259 and 260:
The Spinner Icon module Application
Page 261 and 262:
Drag and Drop Example: The Response
Page 263 and 264:
Autocompletion: Example # In text f
Page 265 and 266:
Global AJAX Hooks # In public/javas
Page 267 and 268:
RJS Reuse module ApplicationHelper
Page 269 and 270:
Routing Going Beyond :controller/:a
Page 271 and 272:
Anatomy of a Route • map.route_na
Page 273 and 274:
splat params map.connect ‘*anythi
Page 275 and 276:
Routes in the console rs = ActionCo
Page 277 and 278:
REST 277
Page 279 and 280:
Rails Implementation of REST: CRUD
Page 281 and 282:
map.resources :articles Method URL
Page 283 and 284:
The Accept Header and Extensions #
Page 285 and 286:
Nested Resources # Nested resources
Page 287 and 288:
Consuming REST # You can any HTTP c
Page 289 and 290:
ActionMailer 289
Page 291 and 292:
Creating a Mailer # Creates app/mod
Page 293 and 294:
Sending Email StatisticsMailer.deli
Page 295 and 296:
Attachments class ApplicationMailer
Page 297 and 298:
Unit Testing Mailers def setup Acti
Page 299 and 300:
Plugins Introduction • Plugins is
Page 301 and 302:
Creating Plugins • Generate your
Page 303 and 304:
The Rails Module Inclusion Pattern
Page 305 and 306:
ActiveSupport Introduction ActiveSu
Page 307 and 308:
Enumerations groups = posts.group_b
Page 309 and 310:
20.bytes 20.megabytes 20.seconds 20
Page 311 and 312:
"åäö".size => 6 "åäö".chars.s
Page 313 and 314:
Rails 2.0 • No radical changes, m
Page 315 and 316:
Deployment 315
Page 317 and 318:
FastCGI • FastCGI is a long runni
Page 319 and 320:
Typical Mongrel Architecture • Th
Page 321 and 322:
Mongrel Alternative: LiteSpeed •
Page 323 and 324:
How to Use Capistrano gem install -
Page 325 and 326:
Custom Capistrano Tasks def mongrel
Page 327 and 328:
Capistrano 2.0 • New homepage at
Page 329 and 330:
Gem Dependencies • It’s a good
Page 331 and 332:
Security • SQL Injection - always
Page 333 and 334:
Performance II • Use Memcached an
Page 335 and 336:
Resources 335
Page 337 and 338:
Videos and Audio • PeepCode.com -
Page 339 and 340:
Applications and Frameworks • Ric
Page 341:
Advice • Go with the flow. Stay o
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