How to use my view helpers in my ActionMailer views?

For all mailers in Rails 3 (setting "application" helper):

# config/application.rb:
...
config.to_prepare do
  ActionMailer::Base.helper "application"
end

In the mailer class that you are using to manage your emails:

class ReportMailer < ActionMailer::Base
  add_template_helper(AnnotationsHelper)

  ...
end

In Rails 3, just use the helper method at the top of your ActionMailer class:

helper :mail   # loads app/helpers/mail_helper.rb & includes MailHelper

I just passed in a block, since I only need it in the one Mailer:

helper do
  def host_url_for(url_path)
    root_url.chop + url_path
  end
end

(be sure to set config.action_mailer.default_url_options.)

(and if you use url_for, be sure to pass in :only_path => false)

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