[Beginning Rails 3] Listing 9-11. Adding the comment_added method to app/models/notifier.rb

notifier.rb

class Notifier < ActionMailer::Base
  default :from => "from@example.com"

  def email_friend(article, sender_name, receiver_email)
    @article = article
    @sender_name = sender_name

    attachments["rails.png"] = File.read(Rails.root.join("public/images/rails.png"))
    mail :to => receiver_email, :subject => "Interesting Article"
  end
  
  def comment_added(comment)
    @article = comment.article
    mail :to => @article.user.email, :subject => "New comment for '#{@article.title}'"
  end
end