[Code School] Rails API Routing Note

假如web application需要提供API時，為了讓routing有效率及提升routing table的可讀性
原本的routes.rb如下

routes.rb

Rails.application.routes.draw do	
	resources :posts					# http://your-domain/posts
	
	constraints subdomain: 'api' do
		resources :contents			# http://api.your-domain/contents
  end
end  

為了讓controller的目錄更有組織性，可以加上namespace

routes.rb

Rails.application.routes.draw do	
	resources :posts					
	
	constraints subdomain: 'api' do
		namespace :api do 
			resources :contents				# http://api.your-domain/api/contents
    end
  end
end  

雖然controller目錄變乾淨，但URL卻多出個api/contents。
加入path

routes.rb

Rails.application.routes.draw do	
	resources :posts					
	
	constraints subdomain: 'api' do
		namespace :api, path: '/' do 
			resources :contents				# http://api.your-domain/contents
    end
  end
end  

最後用一行搞定

routes.rb

Rails.application.routes.draw do	
	resources :posts					
	
	namespace :api, path: '/', constraints: { subdomain: 'api' } do 
		resources :contents		 
  end
end