Rails 4 Asset Pipeline not combining or minifying assets -

i started playing rails4 , can't asset pipeline work correctly. site loading fine in staging environment, except none of css or js being combined or minified in rails 3. there changed between versions?

here staging.rb environment file:

myapp::application.configure   config.cache_classes = true   config.eager_load = true   config.consider_all_requests_local       = false   config.action_controller.perform_caching = true   config.serve_static_assets = false   config.assets.js_compressor = :uglifier   config.assets.compile = false   config.assets.digest = true   config.assets.version = '1.0'   config.log_level = :info   config.cache_store = :dalli_store   config.i18n.fallbacks = true   config.active_support.deprecation = :notify   config.log_formatter = ::logger::formatter.new end 

this caused issue on side. somehow set environment variables on server 'development', never running staging file...

regarding @frandroid's answer, don't want set

config.assets.compile = true 

as lazily compile assets in production. should make sure compiled during pushing of files server, or before hand, ensure greatest performance.

here's final staging.rb file:

myapp::application.configure   config.cache_classes = true   config.eager_load = true   config.consider_all_requests_local       = false   config.action_controller.perform_caching = true   config.serve_static_assets = false   config.assets.js_compressor = :uglifier   config.assets.compile = false   config.assets.digest = true   config.assets.version = '1.0'   config.log_level = :info   config.cache_store = :dalli_store, env["memcachier_servers"].split(","),                     {:username => env["memcachier_username"],                      :password => env["memcachier_password"]}   config.i18n.fallbacks = true   config.active_support.deprecation = :notify   config.log_formatter = ::logger::formatter.new end