activerecord/test/models/car.rb


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class Car < ActiveRecord::Base
  has_many :bulbs
  has_many :funky_bulbs, class_name: 'FunkyBulb', dependent: :destroy
  has_many :foo_bulbs, -> { where(:name => 'foo') }, :class_name => "Bulb"

  has_one :bulb

  has_many :tyres
  has_many :engines, :dependent => :destroy
  has_many :wheels, :as => :wheelable, :dependent => :destroy

  scope :incl_tyres, -> { includes(:tyres) }
  scope :incl_engines, -> { includes(:engines) }

  scope :order_using_new_style,  -> { order('name asc') }

end

class CoolCar < Car
  default_scope { order('name desc') }
end

class FastCar < Car
  default_scope { order('name desc') }
end