activerecord/test/models/car.rb


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class Car < ActiveRecord::Base

  has_many :bulbs
  has_many :foo_bulbs, :class_name => "Bulb", :conditions => { :name => 'foo' }
  has_many :frickinawesome_bulbs, :class_name => "Bulb", :conditions => { :frickinawesome => true }

  has_one :bulb
  has_one :frickinawesome_bulb, :class_name => "Bulb", :conditions => { :frickinawesome => true }

  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') }
  scope :order_using_old_style,  -> { { :order => 'name asc' } }

end

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

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