Rails - Feb 2011 - STI and Controller Design

Hi,

I have a question about single table inheritance and controllers. Lets
start to talk about my domain. There are two parent models in my
system, they and their children are;
                 class Vehicle < ActiveRecord::Base
 
attr_accessible :name, :model, :engine, :fuel_type .....
                          validates ....................
                          has_many :tires
                 end

                class  Car < Vehicle
                          attr_accessible :car_type, :speed .....
                          validates ....................
                 end
                 class  Truck < Vehicle
 
attr_accessible :load_volume, :number_of_tires .....
                          validates ....................
                 end

                 class Tire < ActiveRecord::Base
                          attr_accessible :diameter, :material ......
                          validates ....................
                         belongs_to : vehicle
                 end

                class  WinterTire < Tire
                          attr_accessible :winter_tire_type....
                          validates ....................
                 end
                 class  SummerTire < Tire
                          attr_accessible :summer_tire_type....
                          validates ....................
                 end

To create restful controllers for these classes I choose generating
parent controllers so;
                class Vehicles < ApplicationController
                         methods
                end
                class Tires < ApplicationController
                         methods
                end

But I end up with a confusion how to use same controllers for creating
different type of child objects. Is my choice feasible or creating
seperate controllers is more suitable? But doesn''t that mean a
conflict with DRY style?
Thank you...
Rushen

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