Require authentication

app/controllers/application_controller.rb

@@ -1,2 +1,3 @@
 class ApplicationController < ActionController::Base
+  before_action :authenticate_user!
 end

app/models/user.rb

@@ -1,6 +1,4 @@
 class User < ApplicationRecord
-  # Include default devise modules. Others available are:
-  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
   devise :database_authenticatable, :registerable,
          :recoverable, :rememberable, :validatable
 

config/routes.rb

@@ -1,7 +1,7 @@
 Rails.application.routes.draw do
-  devise_for :users
+  devise_for :users, path: '', path_names: {registration: 'register'}
+
   resources :users
-  # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
 
   root "users#index"
 end