in application_helper.rb I have
 def image_url(source)
   abs_path = image_path(source)
   unless abs_path =~ /^http/
     abs_path = “#{request.protocol}#{request.host_with_port}#{abs_path}”
   end
   abs_path
 end
and in my email model (order_mailer.rb) I have
class OrderMailer < ActionMailer::Base
 layout 'emails'
 . . .
end

but when I use I get
undefined method `image_url’ for #

This doesn’t work either:

class OrderMailer < ActionMailer::Base
 include ApplicationHelper
 layout 'emails'
 . . .
end