Add registration redirection and mail confirmation sending

app/controllers/registrations_controller.rb

@@ -0,0 +1,7 @@
+class RegistrationsController < Devise::RegistrationsController
+  protected
+
+  def after_inactive_sign_up_path_for(resource)
+    new_user_session_path
+  end
+end

config/application.rb.dist

@@ -35,6 +35,8 @@ module FixinMe
     #
     # URL to use in sent e-mails.
     config.action_mailer.default_url_options = {host: 'localhost'}
+    # https://guides.rubyonrails.org/configuring.html#config-action-mailer-delivery-method
+    config.action_mailer.delivery_method = :sendmail
 
     # List of hosts this app is available at.
     # https://guides.rubyonrails.org/configuring.html#actiondispatch-hostauthorization

config/routes.rb

@@ -1,5 +1,6 @@
 Rails.application.routes.draw do
-  devise_for :users, path: '', path_names: {registration: 'register'}
+  devise_for :users, path: '', path_names: {registration: 'register'},
+    controllers: {registrations: :registrations}
 
   resources :users