best_model.rb

class Model < ParentModel
  include Foo::Bar
  extend Bar::Baz
  acts_as_authentic
  dsl_specific_flags 

  module InternalModule
    ...
  end

  default_scope :order => 'id ASC'

  belongs_to :foo
  has_one :baz
  has_many :bars
  has_many :maz, :through => :daz
  has_and_belongs_to_many :jaz
  serialize :bars, Hash
  ...

  before_validation :foo
  after_validation :bar
  before_save :baz
  before_create :taz
  after_create :daz
  after_save :maz
  after_commit :laz
  ...

  validates_presence_of :id
  validates_uniqueness_of :id
  validates_inclusion_of :rating, :in => [1..10]
  validates_numericality_of :taz
  ...

  accepts_nested_attributes_for :foobar

  scope :by_name, :order => 'name ASC'
  scope :lambda_scope, :lambda => { |lambda| { ... } }
  ...

  attr_reader :foobaz
  attr_accessor :foobar

  delegate :barbaz, :to => :foo
  ...

  def self.class_method
  end

  def instance_method
  end

  protected

  def self.class_method
  end

  def instance_method
  end

  private

  def self.class_method
  end

  def instance_method
  end
end