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class User < ActiveRecord::Base
 
  # I like the conciseness of the new syntax here
  validates :email, length: { maximum: 255 }, presence: true

  # but like the hashrocket syntax here
  before_save :hash_password, :if => :password_hash_required?

end

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>> case "String".class
>> when String
>> puts "I'm a string"
>> else
?> puts "I can't tell what I am"
>> end
I can't tell what I am

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[dev]>> a = User.new
=> #<User id: nil avatar_file_name: nil, avatar_content_type: nil, avatar_file_size: nil, avatar_updated_at: nil, created_at: nil, updated_at: nil>

[dev]>> a.avatar.url
=> "/images/original/missing.png"

[dev]>> a.avatar.path
=> nil

[dev]>> a.avatar.expiring_url

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Last login: Thu May 13 15:49:56 on ttys001
~$ ruby -v
ruby 1.8.7 (2009-06-08 patchlevel 173) [universal-darwin10.0]
~$ rvm list

rvm Rubies

   ree-1.8.6-20090610 [ x86_64 ]
   ruby-1.8.6-p383 [ x86_64 ]
   ruby-1.8.7-p248 [ x86_64 ]

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class Post < ActiveRecord::Base
 
  has_many :authors
  has_many :post_comments

  attr_accessor :post_authors_cache, :post_comments_cache

  def post_authors
    @post_authors_cache ||= begin
      process_post

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class Post < ActiveRecord::Base
 
  has_many :authors
  has_many :post_comments

  attr_accessor :post_authors_cache, :post_comments_cache

  def post_authors
    process_post if post_authors_cache.nil?
    post_authors_cache

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class Post < ActiveRecord::Base
 
  has_many :authors

  attr_accessor :post_authors_cache

  def post_authors_cache
    @post_authors_cache ||= process_post_authors
  end

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# -------------------------------------------
# Simple PostgreSQL Configuration File v. 8.4
# -------------------------------------------

# This file provides a simple configuration with the most common options
# which most users need to modify for running PostgreSQL in production, 
# including extensive notes on how to set each of these.  If your configuration
# needs are more specific, then use the standard postgresql.conf, or add 
# additional configuration options to the bottom of this file.
#

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This example shows how to setup an environment running Rails 3 beta 3 under 1.9.2-head with a 'rails3' gem set.

∴ rvm update --head
# ((Open a new shell)) or do 'rvm reload'

# If you do not already have the ruby interpreter installed, install it:
∴ rvm install 1.9.2-head

# Switch to 1.9.2-head and gemset rails3, create if it doesn't exist. 
∴ rvm --create use 1.9.2-head@rails3