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The following issues are currently present in Heroku if you are not following the steps outlined in the main README


We are currently trying to talk with Heroku to iron these out.

  1. Will not work on heroku on an application with a RAILS_ENV configured as anything other than production
  2. Will not work on heroku using ENV variables with the configuration as described below, you must hardcode all variables


When you see rake assets:precompile during deployment. Heroku is actually running something like

env RAILS_ENV=production DATABASE_URL=scheme://user:pass@ bundle exec rake assets:precompile 2>&1

This means the RAILS_ENV you have set via heroku:config is not used.

Workaround: you could have just one S3 bucket dedicated to assets and configure AssetSync to not delete existing files:

AssetSync.configure do |config|
  config.fog_directory = 'app-assets'
  config.existing_remote_files = "keep"

2. ENV varables not available

Currently when heroku runs rake assets:precompile during deployment. It does not load your Rails application's environment config. This means using any ENV variables you could normally depend on are not available. For now you can just run heroku run rake assets:precompile after deploy.

Workaround: you could just hardcode your AWS credentials in the initializer or yml

AssetSync.configure do |config|
  config.aws_access_key_id = 'xxx'
  config.aws_secret_access_key = 'xxx'
  config.fog_directory = 'mybucket'