Sending HTML template emails with attachments.rb

class SomeMailer < ActionMailer::Base

  # assumes that there's a file named pretty_template.html.erb in app/views/some_mailer
  def html_email_with_attachment(email_address, msg)
    recipients [email_address]
    from "hello@world.com"
    subject "This is an html email with an attachment"

    # have to set content_type explicitly
    content_type "multipart/alternative"

    # then set the html part.  Note that there is no call to body(), but 
    # the second argument is a hash containing what you'd put into body() normally.
    part(:content_type => "text/html",
         :body => render_message("pretty_template", :message => msg)

    attachment(:content_type => "text/csv",
               :filename => "attachment.csv",
               body => CSVGenerator.generate_csv_string)

    # as a note, all attachment is doing is adding transfer_encoding and disposition
    # part(:content_type => "text/csv",
    #      :transfer_encoding => "base64",
    #      :disposition => "attachment",
    #      :filename => "attachment.csv",
    #      :body => CSVGenerator.generate_csv_string)
  end

end