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CHAPTER 8 SENDING AND RECEIVING MAIL
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deliver_email_friend, Action Mailer will call the email_friend method in the EventMailer
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class and generate an email message as per that method. After the email message is created, it is passed to the deliver method, which performs the actual delivery. This is important. Every time you create a mail action, you call it directly from the mailer class (in our case, EventMailer), prefixed with deliver_. If you had a mailer class called Notifier and a mail action called invitation, you would call it using Notifier.deliver_invitation. Before we try this out, our email_friend method still needs a bit of work. We need to augment it so that it sets a meaningful title and uses the email parameter we re collecting from the form and passing into the method. Listing 8-5 shows the changes.
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Listing 8-5. Subject, Recipients, and From Added to email_friend, in app/models/event_mailer.rb
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def email_friend(recipient) @subject = '[Eventalicious] Check out this great event' @from = 'Eventalicious <events@example.com>' @recipients = recipient @sent_on = Time.now @body = {} @headers = {} end
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Notice how we ve added a required argument called recipient, which we use to set the @recipients variable. We ve also filled out the @subject and @from variables to make them more meaningful. Next, we want our email message to have some sort of formatting and include the URL of our application. Let s change the template file located in app/views/event_mailer/ email_friend.rhtml and make it look like Listing 8-6.
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Listing 8-6. event_mailer Template, in app/views/event_mailer/email_friend.rhtml
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One of your friends thinks you'll like the events we have listed. Come check the event on our web site at http://eventalicio.us Sent on: <%= Time.now %>
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Finally, we can give this a try in a browser. Fill out the email form using your own email address, so that you can see what the email message will look like. If all goes according to plan, you should receive a message that looks something like this:
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CHAPTER 8 SENDING AND RECEIVING MAIL
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Date: Tue, 1 May 2007 05:22:10 +0400 From: Event Application <events@todo.com> To: recipient@example.com Message-Id: <44e978a7cad5e_1f5f7ba03bf@localhost.tmail> Subject: Check out this great event Content-Type: text/plain; charset=utf-8 One of your friends thinks you'll like the events we have listed. Come check the event on our web site at http://eventalicio.us Sent on: Tue May 01 05:22:10 +0400 2007
This is a plain text message, the default content type. In the next section, we ll show you how to send email messages that use rich, HTML formatting.
Sending HTML Email
So far, our email message is pretty plain. To make it a bit more interesting and informative, we ll add a link to the specific event being recommended and include the sender s name in the message. We ll also make it more visually appealing for users with rich email clients (like Gmail) by adding some HTML formatting. We ll start by redefining the email_friend mailer action in app/models/event_mailer.rb. To indicate that we re sending an HTML-formatted message, we need to set the @content_type variable inside the email_friend method body. We also want to accept a few extra arguments to the method, specifically, the sender s name and the event in question. Listing 8-7 shows the required changes to email_friend.
Listing 8-7. Sender and Event Added to email_friend, in app/models/event_mailer.rb
class EventMailer < ActionMailer::Base def email_friend(recipient, sender_name, event) @subject = '[Eventalicious] Check out this great event' @from = 'Eventalicious <events@example.com>' @recipients = recipient @content_type = 'text/html' @body = { :sender_name => sender_name, :event => event } end end
CHAPTER 8 SENDING AND RECEIVING MAIL
In addition to the new arguments, we ve also modified the subject line, used the @content_type variable to set the content type to text/html (instead of text/plain), and added some options to the @body hash that we can use in our template. Any key/value pairs you set in the @body hash will be available in your mailer template via instance variables named after the given keys. In our case, we ll have access to the @sender_name variable and the @event variable, initialized with the sender_name and event arguments, respectively. Now that the mailer method can accept these additional arguments, the next thing to do is pass them in when we invoke the mailer from the controller, as shown in Listing 8-8.
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