Scoping resource routes in Rails 4 - ruby-on-rails

Question

I have a resources :shops
which results in a /shops, /shops/:id, etc
I know I can scope collection or members with
resources :shops do
scope ":city" do
# collection and members
end
end
or do it before with
scope ":city" do
resources :shops
end
But I can't figure out how to make the route be on all members (including the standard REST ones) and collection, like so
/shops/:city/
/shops/:city/:id

Answer 1

As per your use case and question, you are trying to have logically wrong routes. You have shops within the city, NOT city within the shop.
Firstly you should normalize your database. You should create another table cities and replace your city attributes with city_id in shops table.
You need has_many and belongs_to association between cities and shops.
# Models
class City < ActiveRecord::Base
has_many :shops
... # other stuff
end
class Shop < ActiveRecord::Base
belongs_to :city
... # other stuff
end
Routes
resources :cities do
resources :shops
end
It will generate routes like:
POST /cities/:city_id/shops(.:format) shops#create
new_city_shop GET /cities/:city_id/shops/new(.:format) shops#new
edit_city_shop GET /cities/:city_id/shops/:id/edit(.:format) shops#edit
city_shop GET /cities/:city_id/shops/:id(.:format) shops#show
PATCH /cities/:city_id/shops/:id(.:format) shops#update
PUT /cities/:city_id/shops/:id(.:format) shops#update
DELETE /cities/:city_id/shops/:id(.:format) shops#destroy
Logically, these routes will show that in which city the particular shop exists.

Answer 2

Namespace
You may wish to consider including a namespace
Since you're trying to pull up the cities for shops (IE I imagine you want to show shops in Sao Paulo), you'd be able to do this:
#config/routes.rb
namespace :shops do
resources :cities, path: "", as: :city, only: [:index] do #-> domain.com/shops/:id/
resources :shops, path: "", only: [:show] #-> domain.com/shops/:city_id/:id
end
end
This will allow you to create a separate controller:
#app/controllers/shops/cities_controller.rb
Class Shops::CitiesController < ApplicationController
def index
#city = City.find params[:id]
end
end
#app/controllers/shops/shops_controller.rb
Class Shops::ShopsController < ApplicationController
def show
#city = City.find params[:city_id]
#shop = #city.shops.find params[:id]
end
end
This will ensure you're able to create the routing structure you need. The namespace does two important things -
Ensures you have the correct routing structure
Separates your controllers