Rails Cloudfront assets not served

I set-up Cloudfront with Heroku for Rails and in the beginning it worked fine. I noticed in the last days that the assets are not served from cloudfront.net any longer.

Production.rb

Rails.application.configure do
  config.cache_classes = true
  config.eager_load = true
  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true
  config.action_controller.asset_host = 'http://d2t6o5tnu5etuf.cloudfront.net'
  config.serve_static_files = true
  config.assets.js_compressor = :uglifier
  config.assets.css_compressor = :sass
  config.assets.compile = true
  config.assets.digest = true
  config.assets.version = '1.0'
  config.log_level = :info
  config.i18n.fallbacks = true
  config.active_support.deprecation = :notify
  config.log_formatter = ::Logger::Formatter.new
  config.active_record.dump_schema_after_migration = false
end

I can reach all my assets under the cloudfront adress and in chrome i can see that application-5deb6995ce9b984d469b27c58cc92a095d19cd13e0acd622ffe426c41826e055.js gets served from cloudfront server. However all static images on the page e.g. /assets/shop/banners/2.jpg do not.

It seems to have to do with the precompiling, since it does not look for the fingerprint version of the file, or?

In my gem-file I have the following included:

group :production, :staging do
      gem 'rails_12factor'
      gem 'pg'
 end

Solution

As tegon poined out, image_tag is or image_url is needed to serve the assets from cloudfront. I had the usual "img src" reference in my code, which will not be recognized.

Changed img src to image_tag or image_url and it was working. Thanks!