Prefix Verb   URI Pattern                  Controller#Action
        root GET    /                            products#index
       login GET    /login(.:format)             sessions#new
             POST   /login(.:format)             sessions#create
      logout DELETE /logout(.:format)            sessions#destroy
sessions_new GET    /sessions/new(.:format)      sessions#new
      signup GET    /signup(.:format)            users#new
      create POST   /create(.:format)            barcodes#create
    products GET    /products(.:format)          products#index
             POST   /products(.:format)          products#create
 new_product GET    /products/new(.:format)      products#new
edit_product GET    /products/:id/edit(.:format) products#edit
     product GET    /products/:id(.:format)      products#show
             PATCH  /products/:id(.:format)      products#update
             PUT    /products/:id(.:format)      products#update
             DELETE /products/:id(.:format)      products#destroy
       users GET    /users(.:format)             users#index
             POST   /users(.:format)             users#create
    new_user GET    /users/new(.:format)         users#new
   edit_user GET    /users/:id/edit(.:format)    users#edit
        user GET    /users/:id(.:format)         users#show
             PATCH  /users/:id(.:format)         users#update
             PUT    /users/:id(.:format)         users#update
             DELETE /users/:id(.:format)         users#destroy