Example Rails model with all the bells and whistles

flying_spaghetti_monster.rb

# == Schema Information
#
# Table name: flying_spaghetti_monsters
#
#  id          :integer(4)      not null, primary key
#  awesomeness :string
#  meatballs   :boolean
#  last_seen   :datetime

# model-specific requires
require 'foo'

class FlyingSpaghettiMonster < ActiveRecord::Base
  
  # includes & plugin declarations
  include AwesomeSauce
  acts_as_omnicient
  
  # class variables & constants
  PANT_SIZES = %w(Small Medium Large Humongaginormous)
  @@per_page = 10

  # accessors & readers
  attr_accessible :awesomeness
  
  # before/after/around filters
  before_create :set_initial_awesomeness
  
  # relationships
  has_one    :all_seeing_eye
  has_many   :noodly_appendages
  belongs_to :dimension
  accepts_nested_attributes_for :noodly_appendages
  
  # validations
  validates_presence_of :meatballs
  
  # named scopes
  scope :recently_spotted, -> { :conditions => ['last_seen >=', 1.month.ago] }
  
  # class methods
  def self.email_worshippers
    emails = worshippers.all.collect(&:email)
    WorshipperMailer.newsletter_to(emails).deliver
  end
  
  # virtual attribute definitions
  def genus
    "flagamorphicus #{awesomeness}ica"
  end
  
  def supa_awesome?
    awesome == 'supa'
  end
  
  # instance methods
  def appendage_count
    appendages.count
  end
  
  def add_appendage
    appendage.create!(:flying_spaghetti_monster_id => id, :size => 'monsterous')
  end
  
  # defined getters & setters
  def per_page
    @@per_page
  end

  def per_page=(num)
    @@per_page = (num + 1)
  end
  
  # protected methods
  protected
  
  def worshipper_names
    worshippers.all.collect(&:name)
  end

  # private methods
  private
  
  def set_initial_awesomeness
    awesomeness = 'semi-awesome'
  end 
  
end

__END__
Unstructured heredoc text or template
Seriously, don't use this unless you 
are doing some fancy single-file app 
or something

Group class variables and constants together and move up closer to the top.