Heroku does NOT compile files under assets pipelines in Rails 4

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Heroku’s asset plugins no longer work since Rails 4 does not support plugins. You need to use Heroku’s asset gems instead. Place this in your Gemfile:

group :production do
  gem 'rails_log_stdout',           github: 'heroku/rails_log_stdout'
  gem 'rails3_serve_static_assets', github: 'heroku/rails3_serve_static_assets'
end

Follow Heroku’s guide on getting started with Rails 4.

Update (07/22/2013): Heroku now supplies a different gem to precompile assets.

group :production do
  gem 'rails_12factor'
end

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