S3 integration with Spree Commerce on Heroku - ruby-on-rails

Question

I know this is a topic that has been covered before but I am currently unable to get this working. I have a vanilla local installation of the spree commerce engine (version 2.3.3) which I have deployed to Heroku with a view to getting working before embarking on any customisation.
I have followed the advice of Daniel Pritchett in a similar thread and used the configuration he suggests at https://gist.github.com/dpritchett/c86f6b617d784f943096, and so have a spree_images_paperclip.rb file looking as such:-
Spree.config do |config|
attachment_config = {
s3_credentials: {
access_key_id: ENV["AWS_ACCESS_KEY_ID"],
secret_access_key: ENV["AWS_SECRET_ACCESS_KEY"],
bucket: ENV["AWS_DEV_BUCKET"],
},
s3_host_name: 's3-eu-west-1.amazonaws.com',
storage: :s3,
s3_headers: { "Cache-Control" => "max-age=31557600" },
s3_protocol: "https",
bucket: ENV["AWS_DEV_BUCKET"],
styles: {
mini: "48x48>",
small: "100x100>",
product: "240x240>",
large: "600x600>"
},
path: ":rails_root/public/spree/products/:id/:style/:basename.:extension",
default_url: "/spree/products/:id/:style/:basename.:extension",
default_style: "product",
}
attachment_config.each do |key, value|
Spree::Image.attachment_definitions[:attachment][key.to_sym] = value
end
end unless Rails.env.test?
All config variables are set in a separate YAML file. This all seems to work fine locally, but when I deploy to Heroku, it crashes when I attempt to upload an image through the Spree admin console, unfortunately the generated Heroku logs are very unhelpful, just providing a 500 internal server error.
Does anyone have a good explanation as to why this is not working or alternatively where a good, up-to-date guide exists? Spree are still yet to update their guide since removing S3 support through admin.
Thanks in advance!
Paul

Answer 1

As of version 2.4, Spree has removed support for paperclip and S3 configuration, so you have to configure the relevant gems and tools separately. In the code you provide in your question, you are still trying to assign configuration data to Spree's config, instead of to Paperclip's.
In config/application.rb:
config.paperclip_defaults = {
:storage => :s3,
:s3_credentials => {
:bucket => ENV['S3_BUCKET'],
:access_key_id => ENV['S3_ACCESS_KEY'],
:secret_access_key => ENV['S3_SECRET']
}
}
Also you have to be sure to include the aws-sdk gem in your Gemfile to enable Paperclip's S3 support - Spree no longer includes it for you.
(If you are using Heroku, they have a guide specifically for configuring Paperclip)