Rails ignoring precompiled assets in S3, "could not find file 'bootstrap'" - ruby-on-rails

Question

I'm precompiling assets locally and pushing them to S3. In production I get this error:
heroku[router]: at=info method=GET path=/ host=www.someapp.org fwd="76.87.106.226" dyno=web.1 connect=2ms service=614ms status=500 bytes=0
app[web.1]: ActionView::Template::Error (couldn't find file 'bootstrap'
app[web.1]: app/views/application/_stylesheets.html.erb:1:in `...'
app[web.1]: app/views/layouts/application.html.erb:5:in `...'
app[web.1]:
app[web.1]: (in /app/app/assets/stylesheets/application.css:11)):
app[web.1]: 1: <%= stylesheet_link_tag "application", media: "all" %>
When I run in production mode locally I do not get that error.
Here is my application.rb:
require File.expand_path("../boot", __FILE__)
# Pick the frameworks you want:
require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "active_resource/railtie"
require "sprockets/railtie"
# require "rails/test_unit/railtie"
if defined?(Bundler)
# If you precompile assets before deploying to production, use this line
Bundler.require(*Rails.groups(:assets => %w(development test)))
# If you want your assets lazily compiled in production, use this line
# Bundler.require(:default, :assets, Rails.env)
end
module SomeApp
class Application < Rails::Application
require "ksp"
require "markdowner"
require "patches/carrier_wave"
VERSION = "1.0.0"
# Settings in config/environments/* take precedence over those specified here.
# Application configuration should go into files in config/initializers
# -- all .rb files in that directory are automatically loaded.
# Custom directories with classes and modules you want to be autoloadable.
# config.autoload_paths += %W(#{config.root}/extras)
# Only load the plugins named here, in the order given (default is alphabetical).
# :all can be used as a placeholder for all plugins not explicitly named.
# config.plugins = [ :exception_notification, :ssl_requirement, :all ]
# Activate observers that should always be running.
# config.active_record.observers = :cacher, :garbage_collector, :forum_observer
# Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
# Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
# config.time_zone = "Central Time (US & Canada)"
# The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
# config.i18n.load_path += Dir[Rails.root.join("my", "locales", "*.{rb,yml}").to_s]
# config.i18n.default_locale = :de
# Configure the default encoding used in templates for Ruby 1.9.
config.encoding = "utf-8"
# Configure sensitive parameters which will be filtered from the log file.
config.filter_parameters += [:password]
# Enable escaping HTML in JSON.
config.active_support.escape_html_entities_in_json = true
# Use SQL instead of Active Record"s schema dumper when creating the database.
# This is necessary if your schema can"t be completely dumped by the schema dumper,
# like if you have constraints or database-specific column types
# config.active_record.schema_format = :sql
# Enforce whitelist mode for mass assignment.
# This will create an empty whitelist of attributes available for mass-assignment for all models
# in your app. As such, your models will need to explicitly whitelist or blacklist accessible
# parameters by using an attr_accessible or attr_protected declaration.
config.active_record.whitelist_attributes = true
# Enable the asset pipeline
config.assets.enabled = true
# Version of your assets, change this if you want to expire all your assets
config.assets.version = "1.0"
config.generators do |generator|
generator.test_framework :rspec, view_specs: false
end
config.assets.prefix = "/assets/#{Rails.env}"
config.filepicker_rails.api_key = ENV["FILEPICKER_API_KEY"]
# Allow for CORS requests
config.middleware.use Rack::Cors do
allow do
origins "*"
resource "*", headers: :any, methods: [:get, :post, :options]
end
end
end
end
Here is my production.rb:
SomeApp::Application.configure do
# Settings specified here will take precedence over those in config/application.rb
# Code is not reloaded between requests
config.cache_classes = true
# Full error reports are disabled and caching is turned on
config.consider_all_requests_local = false
config.action_controller.perform_caching = true
# Disable Rails's static asset server (Apache or nginx will already do this)
config.serve_static_assets = false
# Compress JavaScripts and CSS
config.assets.compress = true
# Don't fallback to assets pipeline if a precompiled asset is missed
config.assets.compile = false
# Generate digests for assets URLs
config.assets.digest = true
# Defaults to nil and saved in location specified by config.assets.prefix
# config.assets.manifest = YOUR_PATH
# Specifies the header that your server uses for sending files
# config.action_dispatch.x_sendfile_header = "X-Sendfile" # for apache
config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for nginx
# Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
# config.force_ssl = true
# See everything in the log (default is :info)
# config.log_level = :debug
# Prepend all log lines with the following tags
# config.log_tags = [ :subdomain, :uuid ]
# Use a different logger for distributed setups
# config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new)
# Use a different cache store in production
config.cache_store = :dalli_store
# Enable serving of images, stylesheets, and JavaScripts from an asset server
config.action_controller.asset_host = "d20eprk8nbwd96.cloudfront.net"
# Precompile additional assets (application.js, application.css, and all non-JS/CSS are already added)
# config.assets.precompile += %w( search.js )
# Disable delivery errors, bad email addresses will be ignored
# config.action_mailer.raise_delivery_errors = false
config.action_mailer.default_url_options = { host: "www.someapp.org" }
# Enable threaded mode
# config.threadsafe!
# Enable locale fallbacks for I18n (makes lookups for any locale fall back to
# the I18n.default_locale when a translation can not be found)
config.i18n.fallbacks = true
# Send deprecation notices to registered listeners
config.active_support.deprecation = :notify
# Log the query plan for queries taking more than this (works
# with SQLite, MySQL, and PostgreSQL)
# config.active_record.auto_explain_threshold_in_seconds = 0.5
end
Here is my asset_sync.rb:
if defined?(AssetSync) && !(ENV["HOME"] == "/app")
AssetSync.configure do |config|
config.fog_provider = "AWS"
config.fog_directory = ENV["AMAZON_BUCKET"]
config.aws_access_key_id = ENV["AMAZON_S3_KEY"]
config.aws_secret_access_key = ENV["AMAZON_S3_SECRET"]
# Increase upload performance by configuring your region
config.fog_region = "us-west-2"
#
# Don't delete files from the store
config.existing_remote_files = ENV["ASSET_SYNC_EXISTING_REMOTE_FILES"]
#
# Automatically replace files with their equivalent gzip compressed version
config.gzip_compression = ENV["ASSET_SYNC_GZIP_COMPRESSION"]
#
# Use the Rails generated 'manifest.yml' file to produce the list of files to
# upload instead of searching the assets directory.
config.manifest = ENV["ASSET_SYNC_MANIFEST"]
#
# Fail silently. Useful for environments such as Heroku
# config.fail_silently = true
end
end
Here is my application.css:
/*
*= require bootstrap
*= require bootstrap-responsive
*= require font-awesome
*= require chosen
*= require bootstrap/tour
*= require bootstrap/lightbox
*= require_self
*/
In production mode locally the method gives me the correct cloudfront URL.
What's going wrong here?

Answer 1

Turns out despite precompiling locally, Heroku was still trying to precompile on Heroku.
It would fail, and then try to compile the assets live. This would then fail in the way described.
I solved this by creating an empty file /public/assets/manifest.yml, even though my config says assets are in /public/assets/production/