Upgrade to Rails 3.0 Asset Pipeline - 3.1 defaults

application.rb

# 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'
 
# Change the path that assets are served from
# config.assets.prefix = "/assets"

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

development.rb

# Do not compress assets
config.assets.compress = false
 
# Expands the lines which load the assets
config.assets.debug = true

Gemfile

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails',   "~> 3.1.0"
  gem 'coffee-rails', "~> 3.1.0"
  gem 'uglifier'
end

production.rb

# Compress JavaScripts and CSS
config.assets.compress = true
 
# Choose the compressors to use
# config.assets.js_compressor  = :uglifier
# config.assets.css_compressor = :yui
 
# 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 Rails.root.join("public/assets")
# config.assets.manifest = YOUR_PATH
 
# Precompile additional assets (application.js, application.css, and all non-JS/CSS are already added)
# config.assets.precompile += %w( search.js )