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Ruby on Rails 101 - Presentation Slides for a Five Day Introductory Course

peter_marklund

•

Nov. 02, 2007

• •

Ruby on Rails
101
Presentation slides for a ﬁve day
introductory course
...

This work is licensed under a Creative Commons Attribution 3.0 United States License (http://
creativecommons.org/licenses...

Agenda
Monday Tuesday Wednesday Thursday Friday
•Migrations ...

Kung-Fu?

“Ruby on Rails is astounding. Using it is like watching a kung-fu movie,
where a dozen bad-ass frameworks prepar...

Installation
• InstantRails - One-Click install on Windows
• Locomotive - One-Click install on OS X
• Better options for M...

Rails background

• Jason Fried + David Heinemeier Hanson =>
BaseCamp, Ruby on Rails
• Java, PHP => Ruby
• Hottest Hacke...

Rails Elevator Pitch

Ruby on Rails is an open-source web framework
that’s optimized for programmer happiness and
sustai...

Rails Philosophy and
Strengths
• Ruby - less and more readable code, shorter development times, simple but
power...

MVC Request Cycle
1. A request is made from the browser to the URL
http://localhost:3000/users/show/1.

2. A Rails serv...

building a Demo
Application
• Installing plugins with script/plugin install
• Code generation with script/gener...

Directory Structure
app
controllers
helpers
models
views
layouts
conﬁg
...

Rake

• Rake lets you deﬁne a dependency tree of tasks to be
executed.
• Rake tasks are loaded from the ﬁle Rakeﬁle
• Ra...

Useful Rake Tasks
• db:migrate

• db:sessions:create

• doc:app

• doc:rails

• log:clear

• rails:freeze:gems

• rails:fr...

script/*
• about

• breakpointer

• console

• generate

• plugin

• runner

• server

• script/igoruby/clear_sessions

...

Environments

• Every environment has a database connection in
conﬁg/database.yml and a conﬁguration ﬁle under
conﬁg/e...

conﬁg/environment.rb

• log level
• how sessions are stored
• schema format
• pluralization rules
• Load custom libraries ...

Debugging
• raise @object.inspect
• raise User.instance_methods(false).sort.join(quot;, quot;)
• <%= debug @object %>
• sc...

“I always thought Smalltalk would beat Java. I just
didn’t know it would be called ‘Ruby’ when it did”

...

The Ruby Language
• Generic, interpreted, reﬂective, with garbage
collection
• Optimized for people rather than computer...

Everything in Ruby is:

• Assignment - binding names to objects
• Control structures - if/else, while, case
• Sending mess...

Ruby is Line Oriented
• Statements are separated by line breaks
• You can put several statements on one line if you
sepa...

Deﬁning a class and
Instantiating an
Object
class Person
# Constructor - invoked by Person.new
def initializ...

Class Inheritance
# Programmer “is a” Person and extends it
# with additional characteristics
class Programmer < Person
...

Getter- and Settter
Methods
class Person
def initialize(name)
self.name = name
end

def name
@name
en...

attr_accessor
class Person
attr_accessor :name

def initialize(name)
self.name = name
end
end

person = Person.n...

Variable/Method
Ambiguity Gotcha
class Person
attr_writer :paid

def initialize
@paid = false
end

def paid?
...

Methods
• When invoking a method argument parenthesis are optional

• Methods always have a receiver. The implicit receive...

Deﬁning Class
Methods
class Person
def self.class_method
puts “class method invoked”
end

class << se...

Singleton Classes and
Methods
# Every object has two classes: the class of which
# it is an instance, and a singlet...

Naming Conventions
• MyClass
• method_name, dangerous_method!,
question_method?, setter_method=
• MY_CONSTANT = 3.14
• l...

Boolean expressions
• All objects evaluate to true except false and nil

• false and true are the only instances of FalseC...

assignment
• a, b = b, a # swapping values
• a = 1; b = 1
• a=b=1
• a += 1 # a = a + 1
• a, b = [1, 2]
• a = b || c
• a ||...

Idiom: Assignment with
Boolean Expression
# Overly verbose:
user_id = nil
if comments
if comments.first
if comment...

$modules # Mixins - instead of multiple inheritance module FullName def full_name quot;#{first_name} #{last_name}quot...$

Modules vs Classes

• Modules model characteristics or properties of
entities or things. Modules can’t be instantiated.
...

Everything is an
object
• 2 + 2 is equivalent to 2+(2) and 2.send(:+, 2)
• 2.hours.ago
• 2.class # => Fixnum
•...

Constants

• Constants deﬁned in a class/module are available
within that class/module and outside the class with
the ...

Introspection

andreas = Person.new(“Andreas”)
andreas.inspect

andreas.class # => Person
andreas.class.superclass # => Ob...

Arithmetic and
Conversions
2.class == Fixnum
Fixnum.superclass == Integer
Integer.superclass == Numeric

3.0.c...

String class
“ruby”.upcase + “ “ + “rails”.capitalize

“time is: #{Time.now}n second line”

‘no interpolation “here” #{Tim...

array class
a = [“Ruby”, 99, 3.14]
a[1] == 99
a << “Rails”
[‘C’, ‘Java’, ‘Ruby’] == %w{C Java Ruby}
[1, 2, 3].map { |x| ...

hash class

h = {:lang => ‘Ruby’, :framework => ‘Rails’}
h[:lang] == ‘Ruby’
h[:perl] == nil
ENV = {“USER” => “peter”, “SHE...

Symbols
# Symbols start with a colon
:action.class == Symbol
:action.to_s == “action”
:action == “action”.to_sym

# There ...

More About methods

• Arbitrary number of arguments: def my_methods(*args)

• Converting Array to arguments: my_method([a,...

Range Class
# Two dots is inclusive, i.e. 1 to 5
(1..5).each { |x| puts x**2 }

# Three dots excludes the last item,
# i.e...

Structs

Rating = Struct.new(:name, :ratings)
rating = Rating.new(quot;Railsquot;, [ 10, 10, 9.5, 10 ])

puts rating.name
...

if, unless and the ?
Operator
message = if count > 10
“Try again”
elsif tries == 3
...

Iterators: while, until,
and for. Keywords: break
and next
while count < 100
puts count
count += 1
end

# St...

case
case x
when 0
when 1, 2..5
puts quot;Second branchquot;
when 6..10
puts quot;Third branchquot;
when *[11, 12]
p...

blocks, closures, and
proc objects
def invoke_block
puts quot;before blockquot;
yield 5
puts quot;after blockqu...

$blocks - usage examples # Iteration [1, 2, 3].each {|item| puts item } # Resource Management file_contents = ...$

$common string operations “ “.blank? == true my_string.each_with_index { |line, i| puts “#{i}: #{line}” ...$

Using the dup Method
on Method Arguments
# Methods that change their receiver end with an exclamation mark by con...

regular expressions
puts “matches” if “Ruby” =~ /^(ruby|python)$/i
“GonRuby” =~ /Gos+(w+)/m; $1 == “Ruby”
“I Go Ruby =~ /g...

exceptions
begin
raise(ArgumentError, “No file_name provided”) if !file_name
content = load_blog_data(file_name)
rai...

invoking external
programs

system(“ls -l”)
puts $?.exitstatus if !$?.success?
puts `ls -l`

...

Ruby Scripts With RDoc
and Option Parsing
#!/usr/bin/env ruby
# == Synopsis
# This script takes photographs living lo...

Ruby on the Command
Line
# Query and replace
ruby -pi.bak -e quot;gsub(/Perl/, 'Ruby')quot; *.txt

# Grep
ruby -n ...

open class deﬁnitions
and Method Aliasing
class Peter
def say_hi
puts quot;Hiquot;
end
end

class Peter
alias_m...

Core Classes are Also
Open
class Integer
def even?
(self % 2) == 0
end
end

p (1..10).select { |n| n.even?...

method_missing: A VCR
class VCR
def initialize
@messages = []
end

def method_missing(method, *args, &block)
@...

Using the VCR

vcr = VCR.new
vcr.gsub! /Ruby/, quot;Crazyquot;
vcr.upcase!
object = quot;I Go Rubyquot;
vcr.play_back_to(o...

$const_missing - for Auto Loading Classes def Object.const_missing(name) @looked_for ||= {} str_name = name.to_s rais...$

eval, binding

def evaluate_code(code, binding)
a=2
eval code, binding
end

a=1
evaluate_code(“puts a”, binding) # => ...

$instance_eval andreas = Person.new(“Andreas”) name = andreas.instance_eval { @name } ...$

$class_eval/ module_eval class Person def add_method(method) class_eval %Q{ def #{method} ...$

$deﬁne_method class Array {:second => 1, :third => 2}.each do |method,element| define_method(method) do self[el...$

$Object Space ObjectSpace.each_object(Numeric) { |x| p x } 71$

Class Reﬂection
# Using Class#superclass
klass = Fixnum
begin
pring klass
klass = klass.superclass
print “ < “ if klass
en...

System Hooks:
Class#inherited
class ActiveRecord::Base
# Invoked when a new class is created that extends this
...

Ruby Load path and
auto Loading in Rails
• The Ruby load path is stored in $: and is used when
you require code
• Mode...

Migrations
• A way to evolve your database schema over time
• Migrations use a database independent Ruby API
• script/gene...

Migrations: Managing
Tables and Columns
• create_table, add_column, change_column,
rename_column, rename_table, add_in...

Migrations: Things to
Be Aware Of
• You can use ActiveRecord classes, but this is fragile as
the class deﬁnitions ...

Two Special Columns

created_at and updated_at are maintained
automatically by Rails and keep track of when a
recor...

Migration Example
create_table quot;usersquot;, :force => true do |t|
t.column :login, :string
t.column :em...

Let’s Bring Sexy Back
# Note: this is only available in Edge Rails, *not*
# in Rails 1.2.3

create_table quot;usersqu...

Fundamentals
• One database table maps to one Ruby class
• Ruby classes live under app/models and extend
ActiveRecord::B...

Overriding Naming
conventions

• self.table_name = ‘my_legacy_table’
• self.primary_key = ‘my_id’
• self.pluralize...

CRUD

• Create: create, new
• Read: ﬁnd, ﬁnd_by_<attr>
• Update: save, update_attributes
• Delete: destroy

...

Create = new + save
user = User.new user = User.new(
user.ﬁrst_name = “Dave” :ﬁrst_name => “Dave”,
user....

Save!
user = User.new(
:ﬁrst_name => “Dave”,
:last_name => “Thom...

create! = new + save!

begin
user = User.create!(
:ﬁrst_name => “Dave”,
:last_name => “Thomas”)
rescue...

Column/Attribute Data
Types
MySQL Ruby Class
integer Fixnum
clob, blob, text ...

Custom Attribute
Accessors
class Song < ActiveRecord::Base
def length=(minutes)
# self[:length] = minutes*60
w...

Default Attribute
Values

class User < ActiveRecord::Base
def language
self[:language] ||= “sv”
...

Boolean Attributes

• Everything except nil and false is true in Ruby
• However, in MySQL boolean columns are char(1)
wi...

ﬁnd

• User.ﬁnd(:ﬁrst) # => User object
• User.ﬁnd(:all) # => Array with all User objects
• User.ﬁnd(3) # => User object ...

ﬁnd with :conditions
User.ﬁnd(:all,
:conditions =>
[“ﬁrst_name = ? and created_at > ?”, “David”, 1.year.ago])
User.ﬁn...

Power Find with
Additional Attributes
users = User.ﬁnd(:all,
:conditions => [“users.id = taggings.taggable_id and use...

Everything is a
Find :all
# select * from users limit 1
User.ﬁnd(:ﬁrst) <=> User.ﬁnd(:all, :limit => 1).ﬁrst...

Like Clauses
# Like this
User.ﬁnd(:all, :conditions => [“name like ?”, “%” + params[:name] + “%”)

# Not like this
User.ﬁn...

Dynamic Finders
User.ﬁnd_by_ﬁrst_name “Peter”
User.ﬁnd_all_by_last_name “Hanson”
User.ﬁnd_by_age “20”
User.ﬁnd_by_last_nam...

RecordNotFound
Exception
User.exists?(999) # => false
User.ﬁnd(999) # => raises ActiveRecord::RecordNotFound
User...

Find or Create

# No 'Summer' tag exists
Tag.ﬁnd_or_create_by_name(quot;Summerquot;) # equal to Tag.create(:name => quot;S...

Update
order = Order.ﬁnd(12)
order.name = “Bill Gates”
order.charge = 10000
order.save!

order = Order.ﬁnd(13)
order.updat...

update_attributes is
Syntactic Sugar
def update_attributes(attributes)
self.attributes = attributes
save
end

def u...

Locking

# SELECT * FROM accounts WHERE (account.`id` = 1) FOR UPDATE
account = Account.ﬁnd(id, :lock => true)
account.sta...

Destroy
# Instance method User#destroy
User.count # => 5
u = User.ﬁnd(:ﬁrst)
u.destroy
User.count # => 4

# Class method U...

$Destroy Class Methods def destroy(id) id.is_a?(Array) ? id.each { |id| destroy(id) } : ﬁnd(id).destroy...$

Delete: Does not
Instantiate Objects
# Class method User.delete
User.count # => 5
# delete from users where id = 3
User.d...

Calculations
Person.minimum(‘age’)
Person.maximum(‘age’)
Person.sum(‘age’)
Person.count(:conditions => [“age > ?”, 25])
Pe...

Executing SQL

# Works like ﬁnd(:all) but takes a SQL string or conditions Array
# Post.ﬁnd_by_sql quot;SELECT p.*, c.auth...

Virtual Attributes
# Virtual attributes are atttributes that do not correspond
# directly to database columns like normal ...

Serializing Attribute
Values
class Person < ActiveRecord::Base
serialize params
end

person = Person.new
person....

Composite Attributes
class Name
attr_reader :ﬁrst, :initials, :last
def initialize(ﬁrst, initials, last)
@ﬁrst...

Transactions
Account.transaction do
account1.deposit(100)
account2.withdraw(100)
end

Account.transaction(account1, acco...

Chad Fowler Says

ActiveRecord is an example of a leaky
abstraction and you need to understand the
SQL that it generat...

Controllers

• Controllers are Ruby classes that live under app/
controllers
• Controller classes extend ActionControlle...

$Controller Environment • cookies[:login] = { :value => “peter”, :expires => 1.hour.from_now • headers[‘Co...$

request.env
SERVER_NAME = localhost
PATH_INFO = /
HTTP_ACCEPT_ENCODING = gzip,deﬂate
HTTP_USER_AGENT = Mozilla/5.0 (Macint...

rendering a response

• A response is rendered with the render command
• An action can only render a response once
• Rails...

Render examples
• render :text => “Hello World”
• render :action => “some_other_action”
• render :partial => “top_menu”
• ...

Redirect Examples

• redirect_to :back
• redirect_to(“/help/order_entry.html”)
• redirect_to :controller => ‘blog’, :actio...

$Cookies • A hash stored by the browser • cookies[:preference] = { :value => ‘ice cream’, :expires => 10.days.from_now, ...$

Sessions

• A hash stored on the server, typically in a database
table or in the ﬁle system.
• Keyed by the cookie _sess...

$Conﬁguring Sessions • session :off, :only => %w{ fetch_rss fetch_atom } • session :session_key => ‘_my_app_session_id’,...$

The Flash
• The ﬂash is a way to set a text message to the user in
one request and then display it in the next (typicall...

Best Practice

• Don’t put SQL and too much code in your
controllers/views - it’s a code smell, and
maybe the most com...

What is ActionView?

• ActionView is the module in the ActionPack library
that deals with rendering a response to the cl...

Where Templates Live
• Templates that belong to a certain controller typically
live under app/view/controller_name, i.e....

Template Environment

• Templates have access to the controller objects ﬂash,
headers, logger, params, request, response...

Three Types of
Templates
• rxml - Files with Ruby code using the Builder library
to generate XML. Typically ...

Builder Template
Example: RSS
xml.instruct!
xml.rss quot;versionquot; => quot;2.0quot;, quot;xmlns:dcquot; => q...

rhtml Templates
• <%= ruby code here %> - Evaluates the Ruby code
and prints the last evaluated value to the page.
• <% ...

Partials
• Partials are templates that render a part of a page,
such as a header or footer, or a menu, or a listing of
...

Rendering Partials

• Render a partial from an action with render :partial
=> ‘name_of_partial’
• Render a partial in a...

Passing Variables to
Partials
• Controller instance variables are available in partials

• If you pass :object =>...

Partials and
Collections
<% for article in @articles %>
<%= render :partial => ‘article’, :object => arti...

Layouts

• Layouts are templates under app/views/layouts that
contain common page elements around pages such as
header...

Determining Which
Layout to Use
• If no layout is speciﬁed in the controller or render method then
Rails looks f...

Dynamic Layout
Selection

class BlogController < ActionController::Base
layout :determine_layout

private
...

Passing Data to
Layouts

• You can pass data to layouts via instance variables
• You can also wrap parts of yo...

Helpers

• Helpers are Ruby modules with methods that are
available in your templates.
• Helpers can avoid duplication a...

text_helper.rb
truncate(quot;Once upon a time in a world far far awayquot;, 14)
highlight('You searched for: rails', 'rail...

$url_helper.rb url_for({:controller => ‘blog’}, :only_path => false) link_to quot;Other Sitequot;, quot;http://www.rubyonr...$

Try a different
Templating System:
HAML
#content
.left.column
%h2 Welcome to our site!
%p= print_infor...

Rails Testing
Landscape
Rails Ruby Tool Interface

...

Test::Unit:TestCase
• Test::Unit is a Ruby testing library, very similar to JUnit.

• Rails ships with three types of test...

Unit Tests

• Every model MyModel in Rails has a corresponding
unit test case in the class TestMyModel in test/units/
...

Unit Test Example
require File.dirname(__FILE__) + '/../test_helper'

class UserTest < Test::Unit::TestCase
fixtures :cu...

test_helper.rb
ENV[quot;RAILS_ENVquot;] = quot;testquot;
require File.expand_path(File.dirname(__FILE__) + quot;/../config...

Test Data with
Fixtures

• Fixtures are ﬁles that load test data into the test database that
tests can r...

Fixture Example:
users.yml
quentin:
id: 1
login: quentin
email: quentin@example.com
salt: 7e3041ebc2...

Assertions
• assert(actual, comment) # Asserts truth
• assert_equal(expected, actual, comment)
• assert_in_delta(expected_...

Functional Testing of
Controllers

• Functional tests run against a single controller
instance, simulate requests a...

Functional Test
Example
require File.dirname(__FILE__) + '/../test_helper'
require 'comments_controller'

...

Assertions in
Functional Tests
• assert_response :success|:redirect|:missing|:error
• assert_redirected_to(:control...

assert_select
assert_select “p.warning” # <p class=”warning”>...</p>
assert_select “p#warning” # <p id=”warning”>...</...

Integration Tests
• Test against the Rails dispatcher and can span all
controllers
• Simulate user scenarios/stories.
• ...

Integration Test
Example
class TracerBulletTest < ActionController::IntegrationTest
def test_tracer_bull...

Integration Test
Example: With DSL
class TracerBulletTest < ActionController::IntegrationTest
def test_tracer_...

Running Tests

• rake - runs all tests
• rake test:units
• rake test:functionals
• rake test:integration
• ruby test/unit/...

Stubbing and Mocking

• Sometimes you may need to stub out interactions with external
systems (payment gateways etc.) an...

$Mocha and Stubba Examples client = Goyada::HttpClient.new({}) client.expects(:http_timeout).returns(0.01) cli...$

Submitting Forms and
Clicking Links
• A limitation in most controller and integration tests is
that they bypass for...

rcov
• rcov is a Ruby library that measures code coverage of
tests. It can be used to ﬁnd gaps in your test coverage.
• ...

Heckle
• Heckle will mutate your code by inverting boolean
expressions and run your tests and make sure they fail
• Heck...

AJAX and RJS Testing
• When you develop AJAX functionality you write
actions generate and return JavaScript with the RJS...

ARTS Plugin Usage
Example

# In a controller test...
def test_edit
xhr :get, :edit, :id => users(:aaron), :attri...

HTML Validation and
Link Checking

• I’ve written a plugin called http_test that you can use
to HTML validate all y...

Using the Rails Tests
as Documentation

• A great way to learn the Rails API is to read the tests
that ship with Rail...

Test Case Speciﬁc
Fixtures
• Sharing ﬁxtures across all tests doesn’t scale so well
and can become hard t...

BDD: From Veriﬁcation
to Speciﬁcation
• Behaviour Driven Development (BDD) is Test Driven
Development (TDD) with a ne...

RSpec Examples
require File.join(File.dirname(__FILE__), '/../spec_helper')

context quot;the Call modelquot; do
fixture...

Three Kinds of
Relationships
class A class B ...

has_one

has_one :credit_card, :dependent => :destroy
has_one :credit_card, :dependent => :nullify
has_one :last_comment, ...

belongs_to
class LineItem < ActiveRecord::Base
belongs_to :paid_order,
:class_name => ‘Order’,
...

has_many
has_many :comments, :order => quot;posted_onquot;
has_many :comments, :include => :author
has_many :people, :clas...

$Methods added by has_many Firm#clients (similar to Clients.ﬁnd :all, :conditions => quot;ﬁrm_id = #{id}quot;) ...$

has_many example

blog = User.ﬁnd(1).weblog
blog.posts.count # => 0
blog.posts << Post.new(:title => “Hi, this is my ﬁrst ...

has_and_belongs_to_many
# Requires a join table
create_table :categories_posts, :id => false do
t.column :category_id, :...

Join Models
class Article < ActiveRecord::Base
has_many :readings
has_many :users, :through => :readings
end
class Use...

Join Model with
Conditions
class Article < ActiveRecord::Base
has_many :happy_users, :through => :readings,
...

Extending
Associations
class User < ActiveRecord::Base
has_many :articles, :through => :readings do
d...

Polymorphic
Associations
create_table :images, :force => true do |t|
t.column :comment, :string
t.column :...

Single Table Inheritance: Table
Deﬁnition
create_table :people, :force => true do |t|
t.column :type, :string
...

Single Table Inheritance: Class
Hierarchy
class Person < ActiveRecord::Base
end

class Customer < Person
end

cl...

Single Table Inheritance: Usage

wilma = Manager.create(:name => 'Wilma Flint', :email =>quot;wilma@here.comquot;,
:dept =...

Acts As List
class Parent < ActiveRecord::Base
has_many :children, :order => :position
end

class Child < ActiveRecord::...

Acts As List: Usage
parent = Parent.new
%w{ One Two Three Four}.each do |name|
parent.children.create(:name => name)
en...

Acts As Tree

create_table :categories, :force => true do |t|
t.column :name, :string
t.column :parent_id, :integer
en...

Acts As Tree: Usage
root = Category.create(:name =>quot;Booksquot;)
fiction = root.children.create(:name =>quot;Fictionquo...

Eager Loading: From
N+1 to 1 Query
# Joins posts, authors, comments
# in a single select
@posts = Post.find(:all,
:co...

Counter Cache
create_table :posts do
...
t.column comments_count, :integer
end

class Post < ActiveRecord::Base
has_...

Association Callbacks
class Project
# Possible callbacks: :after_add, :before_add, :after_remove, :before_remove
has_a...

Validation

• Validations are rules in your model objects to help
protect the integrity of your data
• Validation is inv...

Validation Callback
Methods
class Person < ActiveRecord::Base
def validate
puts “validate invoked”
e...

Validation Errors
class Person < ActiveRecord::Base
def validate
if Person.find_by_name(name)
errors.add(:na...

Validation Macros
validates_acceptance_of
validate_associated
validates_confirmation_of
validates_each
validates_excl...

Validation Macros:
Usage
class User < ActiveRecord::Base
validates_presence_of :name, :email, :password
...

Callback Sequence
create update destroy

before_validation ...

Three Common Ways to
Deﬁne Callbacks
# 1. Defining a method
def before_save
# encrypt password here
end

# 2. Ref...

before_save Example
class User < ActiveRecord::Base
before_save :encrypt_password

private
def encrypt_password
...

after_save Example
class Comment < ActiveRecord::Base
belongs_to :user

def after_save
user.ferret_update
end

de...

Observers
class AuditObserver < ActiveRecord::Observer
observe Order, Payment, Refund

def after_save(model)
model...

after_ﬁnd and
after_initialize: must
be methods
def after_find
end

def after_initialize
end

...

$How Forms Work Form helpers => HTML => params => ActiveRecord validate + save <% form_tag({:action => 'update', :id =...$

$form_for - Wrapping Model Objects <%= error_messages_for :user %> <% form_for :user, @admin_user, :url => {:action =...$

Forms with Multiple
Objects: ﬁelds_for
<% form_for :company do |f| -%>
<%= f.text_field :name %>
<%= f.text_area :desc...

Processing Multiple
Object Form
Submission
def create
@company = Company.new(params[:company])
@product = Produ...

form_helper.rb
fields_for :permission, @person.permission do |fields| ...

text_field(quot;postquot;, quot;titlequot;, quo...

$Select Boxes <% form_for :user do |form| %> <%= form.select(:name, %w{ Andy Bert Chas Dave Eric Fred }) %> <%= ...$

$form_options_helper.rb select(quot;postquot;, quot;categoryquot;, Post::CATEGORIES, {:include_blank => true}) select(qu...$

Ruby on Rails 101 - Presentation Slides for a Five Day Introductory Course

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Ruby on Rails 101 - Presentation Slides for a Five Day Introductory Course

Nov. 02, 2007

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An updated version is available at http://marklunds.com/articles/one/374

Chapters:

* Rails Introduction
* Ruby
* Migrations
* ActiveRecord Basics
* ActionController Basics
* ActionView Basics
* Testing
* ActiveRecord Associations
* ActiveRecord Validations
* ActiveRecord Callbacks
* ActionView Forms
* Filters
* Caching
* AJAX
* Routing
* REST
* ActionMailer
* Plugins
* ActiveSupport
* Rails 2.0
* Deployment
* Resources
* Parting Words of Advice