title: Restful route design for adding item to container
body: <p>My cart can have many folders. Those can be nested, but are always displayed as a whole. I want to design an interface to add new item to the folder.</p>
  
  <p>My plan is to have a button for folder, after clicking it, the products#index is displayed. The user select one product, and in the products#show page, the user fills some options and click submit, then the item is added into the particular folder.</p>
  
  <p>What's a RESTful way to design the routes?</p>
  
  <p>My rough design is the following. Is it okay?</p>
  
  <pre><code>get folders/13/add_products/ 
  get folders/13/add_products/3 
  post folders/13/add_products/3
  </code></pre>