Fixed link_to

app/mailers/application_mailer.rb

 class ApplicationMailer < ActionMailer::Base
-  default from: 'from@example.com'
+  default from: 'noreply@example.com'
   layout 'mailer'
 end

app/views/users/show.html.erb

@@ -15,10 +15,8 @@
    </br>
 
     <div class="actions">
-     <%= form_for(@user, url: my_path(params[:id])) do |f| %>
-      <%= f.submit "Update", class: "btn btn-primary" %>
-      <%= f.submit "My Jobs", class: "btn btn-primary" %>
-     <% end %>
+      <%= link_to "Update", my_info_path, class: "btn btn-primary" %>
+      <%= link_to "My Jobs", "#", class: "btn btn-primary" %>
     </div>
   </div>
  </div>

config/environments/development.rb

@@ -36,7 +36,6 @@ Rails.application.configure do
 
   config.action_mailer.perform_caching = false
 
-  config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
   # Print deprecation notices to the Rails logger.
   config.active_support.deprecation = :log
 
@@ -60,4 +59,11 @@ Rails.application.configure do
   # Use an evented file watcher to asynchronously detect changes in source code,
   # routes, locales, etc. This feature depends on the listen gem.
   config.file_watcher = ActiveSupport::EventedFileUpdateChecker
+
+  config.action_mailer.delivery_method = :smtp
+  # Use this on the cloud IDE.
+  config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
+  config.action_mailer.smtp_settings = { address: '127.0.0.1', port: 1025 }
+  # Use this if developing on localhost.
+  # config.action_mailer.default_url_options = { host: host, protocol: 'http' }
 end

db/migrate/20191126074641_devise_create_users.rb

-# frozen_string_literal: true
-
 class DeviseCreateUsers < ActiveRecord::Migration[6.0]
   def change
     create_table :users do |t|
@@ -29,7 +27,7 @@ class DeviseCreateUsers < ActiveRecord::Migration[6.0]
       t.string :remember_digest
       t.datetime :activated_at
       t.string :activation_digest
-      # t.datetime :confirmation_sent_at
+      t.datetime :confirmation_sent_at
       # t.string   :unconfirmed_email # Only if using reconfirmable
 
 
@@ -44,7 +42,7 @@ class DeviseCreateUsers < ActiveRecord::Migration[6.0]
     add_index :users, :email, unique: true
     add_index :users, :username, unique: true
     add_index :users, :reset_digest, unique: true
-    # add_index :users, :confirmation_token,   unique: true
+    add_index :users, :confirmation_token,   unique: true
     # add_index :users, :unlock_token,         unique: true
   end
 end