activerecord/test/models/car.rb


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class Car < ActiveRecord::Base
  has_many :bulbs
  has_many :tyres
  has_many :engines
  has_many :wheels, :as => :wheelable

  scope :incl_tyres, includes(:tyres)
  scope :incl_engines, includes(:engines)

  default_scope :order => 'name desc'

  scope :order_using_new_style,  order('name asc')
  scope :order_using_old_style,  :order => 'name asc'

end