Ruby on Rails

Hello,

I'm attempting to generate emails with inline attachments. I'm using
Action Mailer 4.1.6 and the attachment.inline method, but for some
reason all of my attachments are coming through as regular downloadable
attachments, not as inline attachments. Here's the relevant code:

In emails_mailer.rb:

def send_email(email)
attachments.inline['receipt.jpg'] = {:data =>
File.read("public/items/receipt.jpg").force_encoding("BINARY"),
:mime_type => "image/jpg"}
mail(to: email.recipient, subject: "Email sent on #{Date.today}",
body: email.body)
end

In send_email.html.erb:

<%= image_tag attachments['receipt.jpg'].url %>

I've tried the solutions found here:

http://stackoverflow.com/questions/8356924/rails-attachments-inline-are-not-shown-correctly-in-gmail
http://stackoverflow.com/questions/16564366/rails-inline-mail-attachments-not-working-properly?lq=1
http://www.rubydoc.info/docs/rails/4.1.7/ActionMailer/Base

Still, the email always comes through as a downloadable image. I'm
using Rails 4.1.6.

Any advice or pointers in the right direction?

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