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By now, you know that Rails provides helpful generators to get started writing your own code. You saw generators in action when you created models and controllers in previous chapters. The mailer generator works just like the other generators. Enter the following command to generate the Notifier class with one method named email_friend: $ rails generate mailer Notifier email_friend create invoke create create invoke create app/mailers/notifier.rb erb app/views/notifier app/views/notifier/email_friend.text.erb test_unit test/functional/notifier_test.rb
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The generator creates a mailer class named Notifier, containing the email_friend method you specified on the command line. Notice that the generated Action Mailer class is created in the app/mailers directory; Notifier and any Action Mailer class are subclasses of the ActionMailer::Base class. The generator also creates a template file in the views directory (app/views/notifier/email_friend.text.erb) that corresponds to the email_friend method (action) you use to set up the mailer message. Just like controllers, Action Mailer classes contain methods that, when triggered, execute some code and render a related view of the same name, unless otherwise specified. Listing 9-2 shows the Notifier class located in app/mailers/notifier.rb. The email_friend method has some code that will be the starting point for most of the methods you write using Action Mailer. Listing 9-2. Notifier Class, in app/mailers/notifier.rb class Notifier < ActionMailer::Base default :from => "from@example.com" # Subject can be set in your I18n file at config/locales/en.yml # with the following lookup: # # en.actionmailer.notifier.email_friend.subject # def email_friend @greeting = "Hi" mail :to => "to@example.org" end end
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Action Mailer classes have a class-wide configuration hash that you can modify using the default method. Notice the first line in the Notifier class definition: it sets the sender address (using :from) for all e-mails sent from this class to from@example.com. In the email_friend method body, the first line defines an instance variable named @greeting; just like in controllers, those variables are available in your views. Also in the email_friend method body, the mail method is called with a parameter of :to => "to@example.org", specifying the e-mail address that will receive this message. The mail method accepts an options hash that specifies the various headers of the message. Table 9-3 lists the available methods you use to configure an individual message. Table 9-3. Mailer Instance Variables
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The subject of the e-mail message to be sent. A string or array of e-mail addresses to which the message will be sent. A string specifying the sender of the email message. A string specifying the reply-to e-mail address. The date header. The default is the current date. A string or array of e-mail addresses to carbon-copy with the message. A string or array of e-mail addresses to blind-carbon-copy with the message.
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:subject => "Action Mailer is powerful" :to => "friend@example.com"
from
:from => "sender@example.com"
reply_to
:reply => "sender@example.com"
date
:date => Time.now
:cc => "admin@example.com"
:bcc => ["support@example.com", "sales@example.com"]
The mailer generator creates a template named after the action in the Notifier class in the /app/views/notifier folder: email_friend.text.erb. This is the template that generates the body of the e-mail sent when using the email_friend method. This template works similarly to the templates used for regular views in Action Pack. It s an ERb file, which can contain text and markup mixed with some Ruby code. It also has the same one-to-one relationship between action and view exhibited by Action Pack each action in your mailer class expects one template in the app/views directory.
Handling Basic E-Mail
Let s start enhancing the blog application by adding notify a friend functionality to the article page. The first iteration is a very basic example that sends a text e-mail message containing a brief message. The first piece of the puzzle is to make a change to the routes file, to include a route for the action that will be called after the user submits the form. You add a member route to articles using the member
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