disable logging of assets

config/initializers/quiet_assets.rb

@@ -0,0 +1,11 @@
+Rails.application.assets.logger = Logger.new('/dev/null')
+Rails::Rack::Logger.class_eval do
+  def call_with_quiet_assets(env)
+    previous_level = Rails.logger.level
+    Rails.logger.level = Logger::ERROR if env['PATH_INFO'].index("/assets/") == 0
+    call_without_quiet_assets(env).tap do
+      Rails.logger.level = previous_level
+    end
+  end
+  alias_method_chain :call, :quiet_assets
+end