Notify admin users when new users register

Author: rossta

app/controllers/users/registrations_controller.rb

@@ -16,7 +16,7 @@ def create
     create_user_params = params.require(:user).permit(:email, :password, :password_confirmation)
     @user = User.new(create_user_params)
     if @user.save
-      EmailConfirmationNotifier.deliver_to(@user)
+      NewUserNotificationJob.perform_later(@user)
       redirect_to thanks_users_registration_path, notice: "Welcome to Joy of Rails! Please check your email for confirmation instructions"
     else
       render Users::Registrations::NewView.new(user: @user), status: :unprocessable_entity

app/jobs/new_user_notification_job.rb

@@ -0,0 +1,9 @@
+class NewUserNotificationJob < ApplicationJob
+  queue_as :default
+
+  def perform(user)
+    # Do something later
+    NewUserNotifier.deliver_to(AdminUser.all, user: user)
+    EmailConfirmationNotifier.deliver_to(user)
+  end
+end

app/mailers/emails/admin_user_mailer.rb

@@ -0,0 +1,8 @@
+class Emails::AdminUserMailer < ApplicationMailer
+  def new_user(admin_user:, user:)
+    @admin_user = admin_user
+    @user = user
+
+    mail to: @admin_user.email, subject: "New Joy of Rails User"
+  end
+end

app/notifiers/new_user_notifier.rb

@@ -0,0 +1,12 @@
+class NewUserNotifier < NotificationEvent
+  def self.deliver_to(admin_user, user:, **)
+    new(params: {user_id: user.id}).deliver(admin_user, **)
+  end
+
+  def deliver_notification(notification)
+    admin_user = notification.recipient
+    user = User.find(params[:user_id])
+
+    Emails::AdminUserMailer.new_user(admin_user: admin_user, user: user).deliver_later
+  end
+end

app/views/emails/admin_user_mailer/new_user.html.erb

@@ -0,0 +1,5 @@
+<h2>New User</h2>
+
+<%= mail_to @user.confirmable_email %> just registered for Joy of Rails!
+
+Woo hoo!

app/views/emails/admin_user_mailer/new_user.text.erb

@@ -0,0 +1,5 @@
+New User
+
+<%= @user.confirmable_email %> just registered for Joy of Rails!
+
+Woo hoo!

spec/mailers/emails/admin_user_mailer_spec.rb

@@ -0,0 +1,20 @@
+require "rails_helper"
+
+RSpec.describe Emails::AdminUserMailer, type: :mailer do
+  describe "new_user" do
+    let(:admin_user) { instance_double(AdminUser, email: "[email protected]") }
+    let(:user) { instance_double(User, confirmable_email: "[email protected]") }
+    let(:mail) { Emails::AdminUserMailer.new_user(admin_user:, user:) }
+
+    it "renders the headers" do
+      expect(mail.subject).to eq("New Joy of Rails User")
+      expect(mail.to).to eq(["[email protected]"])
+      expect(mail.from).to eq(["[email protected]"])
+    end
+
+    it "renders the body" do
+      expect(mail.body.encoded).to match("[email protected]")
+      expect(mail.body.encoded).to match("just registered for Joy of Rails!")
+    end
+  end
+end

spec/mailers/previews/emails/admin_user_mailer_preview.rb

@@ -0,0 +1,6 @@
+# Preview all emails at http://localhost:3000/rails/mailers/admin_user
+class Emails::AdminUserMailerPreview < ActionMailer::Preview
+  def new_user
+    Emails::AdminUserMailer.new_user(admin_user: FactoryBot.build(:admin_user), user: FactoryBot.build(:user))
+  end
+end

spec/requests/users/registrations_spec.rb

@@ -43,6 +43,20 @@
       expect(mail.subject).to eq "Confirm your email address"
     end
 
+    it "notifies admin" do
+      email = FactoryBot.generate(:email)
+      admin = FactoryBot.create(:admin_user)
+
+      post users_registration_path,
+        params: {user: {email: email, password: "password", password_confirmation: "password"}}
+
+      perform_enqueued_jobs_and_subsequently_enqueued_jobs
+
+      mail = find_mail_to(admin.email)
+
+      expect(mail.subject).to eq "New Joy of Rails User"
+    end
+
     it "disallows a user to subscribe with existing email" do
       user = FactoryBot.create(:user)
 

spec/support/mail_helpers.rb

@@ -17,8 +17,9 @@ def email_link(email, string)
   end
 
   def perform_enqueued_jobs_and_subsequently_enqueued_jobs
-    perform_enqueued_jobs # Process event job
-    perform_enqueued_jobs # Process mailer job
+    3.times do
+      perform_enqueued_jobs
+    end
   end
 
   private