Agile Web Development with Rails, Edition 4

13.1 Iteration H1: Email Notifications

Create a mailer

rails generate mailer OrderNotifier received shipped

      create  app/mailers/order_notifier.rb

      invoke  erb

      create    app/views/order_notifier

      create    app/views/order_notifier/received.text.erb

      create    app/views/order_notifier/shipped.text.erb

      invoke  test_unit

      create    test/functional/order_notifier_test.rb

Edit development configuration

edit config/environments/development.rb

Depot::Application.configure do

  # Settings specified here will take precedence over those in config/application.rb

  # In the development environment your application's code is reloaded on

  # every request. This slows down response time but is perfect for development

  # since you don't have to restart the web server when you make code changes.

  config.cache_classes = false

  # Log error messages when you accidentally call methods on nil.

  config.whiny_nils = true

  # Show full error reports and disable caching

  config.consider_all_requests_local       = true

  config.action_controller.perform_caching = false

  # Don't care if the mailer can't send

  config.action_mailer.raise_delivery_errors = false

  # Don't actually send emails

  config.action_mailer.delivery_method = :test

  # Alternate configuration example, using gmail:

  #   config.action_mailer.delivery_method = :smtp

  #   config.action_mailer.smtp_settings = {

  #     address:        "smtp.gmail.com",

  #     port:           587,

  #     domain:         "domain.of.sender.net",

  #     authentication: "plain",

  #     user_name:      "dave",

  #     password:       "secret",

  #     enable_starttls_auto: true

  #   }

  # Print deprecation notices to the Rails logger

  config.active_support.deprecation = :log

  # Only use best-standards-support built into browsers

  config.action_dispatch.best_standards_support = :builtin

  # Raise exception on mass assignment protection for ActiveRecord models

  config.active_record.mass_assignment_sanitizer = :strict

  # Do not compress assets

  config.assets.compress = false

  # Expands the lines which load the assets

  config.assets.debug = true

end

Tailor the from address

edit app/mailers/order_notifier.rb

class OrderNotifier < ActionMailer::Base

  default from: 'Sam Ruby <depot@example.com>'

  # Subject can be set in your I18n file at config/locales/en.yml

  # with the following lookup:

  #   en.order_notifier.received.subject

  def received

    @greeting = "Hi"

    mail to: "to@example.org"

end

  # Subject can be set in your I18n file at config/locales/en.yml

  # with the following lookup:

  #   en.order_notifier.shipped.subject

  def shipped

    @greeting = "Hi"

    mail to: "to@example.org"

end

end

Tailor the confirm receipt email

edit app/views/order_notifier/received.text.erb

Dear <%= @order.name %>

Thank you for your recent order from The Pragmatic Store.

You ordered the following items:

<%= render @order.line_items %>

We'll send you a separate e-mail when your order ships.

Text partial for the line items

edit app/views/line_items/_line_item.text.erb

<%= sprintf("%2d x %s",

            line_item.quantity,

            truncate(line_item.product.title, length: 50)) %>

Get the order, sent the confirmation

edit app/mailers/order_notifier.rb

class OrderNotifier < ActionMailer::Base

  default from: 'Sam Ruby <depot@example.com>'

  # Subject can be set in your I18n file at config/locales/en.yml

  # with the following lookup:

  #   en.order_notifier.received.subject

  def received(order)

    @order = order

    mail to: order.email, subject: 'Pragmatic Store Order Confirmation'

end

  # Subject can be set in your I18n file at config/locales/en.yml

  # with the following lookup:

  #   en.order_notifier.shipped.subject

  def shipped(order)

    @order = order

    mail to: order.email, subject: 'Pragmatic Store Order Shipped'

end

end

Invoke mailer from the controller

edit app/controllers/orders_controller.rb

  def create

    @order = Order.new(params[:order])

    @order.add_line_items_from_cart(current_cart)

    respond_to do |format|

      if @order.save

        Cart.destroy(session[:cart_id])

        session[:cart_id] = nil

        OrderNotifier.received(@order).deliver

        format.html { redirect_to store_url, notice:

          'Thank you for your order.' }

        format.json { render json: @order, status: :created,

          location: @order }

      else

        @cart = current_cart

        format.html { render action: "new" }

        format.json { render json: @order.errors,

          status: :unprocessable_entity }

end

end

end

Tailor the confirm shipped email (this time in HTML)

edit app/views/order_notifier/shipped.html.erb

<h3>Pragmatic Order Shipped</h3>

<p>

  This is just to let you know that we've shipped your recent order:

</p>

<table>

  <tr><th colspan="2">Qty</th><th>Description</th></tr>

<%= render @order.line_items %>

</table>

Review HTML partial for the line items

edit app/views/line_items/_line_item.html.erb

<% if line_item == @current_item %>

<tr id="current_item">

<% else %>

<tr>

<% end %>

  <td><%= line_item.quantity %>&times;</td>

  <td><%= line_item.product.title %></td>

  <td class="item_price"><%= number_to_currency(line_item.total_price) %></td>

</tr>

Update the test case

edit test/functional/order_notifier_test.rb

require 'test_helper'

class OrderNotifierTest < ActionMailer::TestCase

  test "received" do

    mail = OrderNotifier.received(orders(:one))

    assert_equal "Pragmatic Store Order Confirmation", mail.subject

    assert_equal ["dave@example.org"], mail.to

    assert_equal ["depot@example.com"], mail.from

    assert_match /1 x Programming Ruby 1.9/, mail.body.encoded

end

  test "shipped" do

    mail = OrderNotifier.shipped(orders(:one))

    assert_equal "Pragmatic Store Order Shipped", mail.subject

    assert_equal ["dave@example.org"], mail.to

    assert_equal ["depot@example.com"], mail.from

    assert_match /<td>1&times;<\/td>\s*<td>Programming Ruby 1.9<\/td>/,

      mail.body.encoded

end

end

rake db:test:load

ruby -I test test/functional/order_notifier_test.rb

Loaded suite test/functional/order_notifier_test

Started

..

Finished in 1.003389 seconds.

2 tests, 8 assertions, 0 failures, 0 errors, 0 skips

Test run options: --seed 61421