RESTful Polymorphic review creation methods for associated models

polyreview.rb

class ProductsController < ApplicationController
  # [...] Product Crud

  def create_review
    @product = Product.find params[:id]
    review = @product.reviews.new
    review.user_id = current_user.id
    review.subject = params[:subject].nil? ? "Untitled" : params[:subject];
    review.body = params[:body]

    respond_to do |format|
      if review.save
        update_popularity @product
        format.html { redirect_to @product, notice: "added review" }
      else
        format.html { redirect_to @product, error: "Unable to review product, errors #{review.errors.full_messages }" }
      end
    end
  end

  private

  def update_popularity
    # => do the stuff
  end

end

class ServicesController < ApplicationController
  # [...] Service Crud

  def create_review
    @service = Service.find params[:id]
    review = @service.reviews.new
    review.user_id = current_user.id
    review.subject = params[:subject].nil? ? "Untitled" : params[:subject];
    review.body = params[:body]

    respond_to do |format|
      if review.save
        format.html { redirect_to @service, notice: "added review" }
      else
        format.html { redirect_to @service, error: "Unable to rate service, errors #{review.errors.full_messages }" }
      end
    end
  end

end


# routes.rb

MyApp::Application.routes.draw do
  resources :products do
    member do
      post :review, to: :create_review # POST /products/:id/review
    end
  end

  resources :services do
    member do
      post :review, to: :create_review # POST /serices/:id/review
    end
  end
end