Rails JSON Rest API: Getting Child Class from Parent via API Call - ruby-on-rails

Question

I have two API controllers in my Rails app for a RESTful setup:
StoresController (has many products)
ProductsController (has one store)
How can I write the API so that
http://localhost:3000/api/v1/stores/37/products
returns only the products for that store(in this case store #37)? I think I'm missing a route and controller method to make that happen.
Routes
namespace :api, defaults: {format: 'json'} do
namespace :v1 do
resources :stores
resources :licenses
end
end
API Controllers
APIController:
module Api
module V1
class ApiController < ApplicationController
respond_to :json
before_filter :restrict_access
private
def restrict_access
api_app = ApiApp.find_by_access_token(params[:access_token])
head :unauthorized unless api_app
end
end
end
end
StoresController:
module Api
module V1
class StoresController < ApiController
def index
respond_with Store.all
end
def show
respond_with Store.find_by_id(params[:id])
end
end
end
end
ProductsController:
module Api
module V1
class ProductsController < ApiController
def index
respond_with Product.all
end
def show
respond_with Product.find_by_id(params[:id])
end
end
end
end
Thanks for any insight.

Answer 1

You want nested resources in your routes:
resources :stores do
resources :products
end
So you have those routes:
GET /stores/:id
GET/POST /stores/:store_id/products
PUT/DELETE /stores/:store_id/products/:id
You'll may also want shallow routes, to avoid deeply nested resources:
resources :stores, shallow:true do
resources :products
end
So you have those routes:
GET /stores/:id
GET/POST /stores/:store_id/products
PUT/DELETE /products/:id
Once you have the routes, you may just first load the parent store, and use the products association:
#store = Store.find(params[:store_id])
#products = store.products

Answer 2

You can scope the products by the store id.
class ProductsController < ApiController
def index
store = Store.find(params[:store_id])
respond_with store.products
end
end
If you look at your route:
http://localhost:3000/api/v1/stores/37/products
You'll find that 37 is part of your route provided in your params, probably in :store_id. Check rake routes to be sure.