ActionMailer - How to add an attachment from s3 - ruby-on-rails

Question

Im trying to add attachments to the contact form on this site Im making but I cant get action mailer to attach the uploaded file. I have paperclip uploading the file to S3 but I cant get it to grab the file and attach it to the message.
My app stack is: Heroku, Rails 3, and paperclip uploading to S3, heres what I have so far:
def contact_notification(sender)
#sender = sender
if attachments.count > 0
# Parse the S3 URL into its constituent parts
uri = URI.parse #sender.photo.url(:original).authenticated_url
# Use Ruby's built-in Net::HTTP to read the attachment into memory
response = Net::HTTP.start(uri.host, uri.port) { |http| http.get uri.path }
# Attach it to your outgoing ActionMailer email
attachments[#sender.attachment_file_name] = response.body
end
mail(:to => xxx)
end
What am I doing wrong? Im still a rails noob so Im piecing this together.

Answer 1

A quick note:
Amazon now requires
gem 'aws-sdk', :require => "aws-sdk"
instead of the s3 gem listed above.

Answer 2

If you don't have an s3 account already go get one here:
http://aws.amazon.com/s3/
You need to add this to your contact model:
app/models/contact.rb
has_attached_file :picture,
:styles => {:large => "275x450>"},
:storage => :s3,
:s3_credentials => "#{RAILS_ROOT}/config/s3.yml",
:path => "appname/:attachment/:style/:id.:extension"
Make sure you appname is your rails app name on heroku. And make sure you rename picture to whatever you have named your picture.
Then you need a config file in config/s3.yml.
development:
bucket: bucked_name
access_key_id: key
secret_access_key: secret
production:
bucket: bucked_name
access_key_id: key
secret_access_key: secret
Make sure you get the key and secret correct.
In your gem file make sure you have these gems install :
gem "aws-s3", :require => "aws/s3"
gem "paperclip"
Then in your form you need a file field and declare the form a multipart:
<% form_for(#contact, :html => {:multipart => true}) do |f| %>
<p><%= f.file_field :picture %></p>
<% end %>
And that should do it.
If you don't have an s3 account already go get one here:
http://aws.amazon.com/s3/
You need to add this to your contact model:
app/models/contact.rb
has_attached_file :picture,
:styles => {:large => "275x450>"},
:storage => :s3,
:s3_credentials => "#{RAILS_ROOT}/config/s3.yml",
:path => "appname/:attachment/:style/:id.:extension"
Make sure you appname is your rails app name on heroku. And make sure you rename picture to whatever you have named your picture.
Then you need a config file in config/s3.yml.
development:
bucket: bucked_name
access_key_id: key
secret_access_key: secret
production:
bucket: bucked_name
access_key_id: key
secret_access_key: secret
Make sure you get the key and secret correct.
In your gem file make sure you have these gems install :
gem "aws-s3", :require => "aws/s3"
gem "paperclip"
Then in your form you need a file field and declare the form a multipart:
<% form_for(#contact, :html => {:multipart => true}) do |f| %>
<p><%= f.file_field :picture %></p>
<% end %>
Then mail your contact with the picture. You said that you were using rails 3?
So in your contact model:
class Contact << ActiveRecord::Base
before_save :mail_user
def mailer_user
ContactMailer.contact_notification(#user).deliver
end
end
Then in your mailer (assuming you are on Rails 3):
class ContactMailer < ActionMailer::Base
default :from => "sam#codeglot.com"
def contact_notification(#user)
#subscription = "test"
#url = "test"
mail(:to => "test#test.com",
:subject => "Test")
end
end
So in your mailer view you need to include and image tag like so:
<%= image_tag(#contact.picture(:small)) %>
Then you just need to send you email after a contact is created and include the attachment.