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CHAPTER 8 SENDING AND RECEIVING MAIL
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Listing 8-1. Sample Action Mailer Configuration Using SMTP in config/environment.rb ,
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ActionMailer::Base.delivery_method :smtp ActionMailer::Base.smtp_settings = { :address => 'mail.example.com', :authentication => :login, :user_name => 'sender@example.com', :password => 'secret' }
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Include your completed configuration code at the bottom of config/environment.rb, make sure you restart your server if it s running, and your application will be ready to send mail.
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Configuring Application Settings
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In addition to the mail server settings, Action Mailer has a set of configuration parameters that can be tweaked to make the library behave in specific ways according to the application or the environment. We re going to stick with the defaults here, so we don t need to set up any special application settings. For reference, Table 8-2 lists the most common configuration options. Just like the server settings, these can be specified in config/environment.rb or in the environment-specific configuration files (config/ environments/*.rb). Table 8-2. Common Action Mailer Application Settings Option
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template_root raise_delivery_errors
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Indicates the base folder from which template references will be made. The default is app/views. Allows you to indicate whether you want errors to be raised when an error occurs while trying to deliver email. This should be set to true in production (in config/environments/production.rb) and false in development (in config/environments/development.rb). Indicates whether messages should really be delivered to the mail server. Keeps an array of all delivered email when the delivery method is set to :test. This is useful when you re in testing mode. Specifies the default character set to be used when sending messages. The default is UTF-8. Specifies the default content type that will be used for outbound mail. The default is text/plain.
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perform_deliveries deliveries default_charset default_content_type
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CHAPTER 8 SENDING AND RECEIVING MAIL
Note When you create a new Rails application, the configuration files automatically use sensible
defaults for each of the development, test, and production environments. Take a quick look in config/ environments to see how Action Mailer behaves in development, production, and test mode to make sure you understand your application s behavior.
Sending Email
Now that we have Action Mailer configured, it s time to see it in action. We ll explore all the possibilities in the Action Mailer world, starting with basic text-only email, and then adding extra email options such as attachments. To demonstrate Action Mailer, we ll enhance our events application by allowing our users to send email to their friends so that they can share information about a specific event. This is a common feature in today s web applications, affectionately referred to as send to friend. By now, you know that Rails provides helpful generators to get started writing your own code. You ve seen generators in action when we created models and controllers in previous chapters. The Mailer generator works just like the other generators. Enter the following command to generate the EventMailer and a method named email_friend.
$ ./script/generate mailer EventMailer email_friend
exists create exists create create create create create
app/models/ app/views/event_mailer test/unit/ test/fixtures/event_mailer app/models/event_mailer.rb test/unit/event_mailer_test.rb app/views/event_mailer/email_friend.rhtml test/fixtures/event_mailer/email_friend
The generator created a mailer class named EventMailer, containing the email_friend method we specified on the command line. Notice that Action Mailer classes are created in the app/models directory; however, EventMailer is a subclass of the ActionMailer::Base class, making it completely different from the Active Record models located in the same folder. The generator also created a template file in the views directory (app/views/ event_mailer that corresponds to the email_friend method (action) we ll use to set up the mailer message. Listing 8-2 shows the EventMailer class located in app/models. You can see that the email_friend method has some code that will be the starting point for most of the methods you ll be writing using Action Mailer.
CHAPTER 8 SENDING AND RECEIVING MAIL
Listing 8-2. EventMailer Class, in app/models/event_mailer.rb
class EventMailer < ActionMailer::Base def email_friend(sent_at = Time.now) @subject = 'EventMailer#email_friend' @body = {} @recipients = '' @from = '' @sent_on = sent_at @headers = {} end end
In the method body, you can see a set of instance variables that will be used to specify the various headers of the message. Table 8-3 lists the available instance variables you use to configure an individual message. Table 8-3. Mailer Instance Variables Variable
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