Hiding Dashboards from the Sidebar

Resources can be removed form the sidebar by removing their index action from the routes. For example:

# config/routes.rb
Rails.application.routes.draw do
  namespace :admin do
    resources :line_items, except: :index
    resources :orders
    resources :products
    root to: "customers#index"

In this case, only Orders and Products will appear in the sidebar, while Line Items can still appear as an association.