优化速度的时候发现低版的 sprockets 未压缩js与css, 升级后即可.

所以同时升级所有的gem至最新版.

Gemfile

@@ -5,7 +5,8 @@ else
 end
 
 gem 'rails', '4.1.1'
-gem 'sass-rails', '~> 4.0.2'
+#gem 'sprockets', '2.12.1'
+gem 'sass-rails', '~> 4.0.3'
 gem 'coffee-rails', '~> 4.0.1'
 gem 'uglifier', '>= 1.3.0'
 gem 'jquery-rails'

Gemfile.lock

@@ -29,7 +29,7 @@ GEM
       tzinfo (~> 1.1)
     angularjs-rails (1.2.16)
     arel (5.0.1.20140414130214)
-    bson (2.2.3)
+    bson (2.2.4)
     builder (3.2.2)
     capybara (2.2.1)
       mime-types (>= 1.16)
@@ -48,9 +48,6 @@ GEM
       mongoid-grid_fs (>= 1.3, < 3.0)
     celluloid (0.15.2)
       timers (~> 1.1.0)
-    celluloid-io (0.15.0)
-      celluloid (>= 0.15.0)
-      nio4r (>= 0.5.0)
     chunky_png (1.3.1)
     coderay (1.1.0)
     coffee-rails (4.0.1)
@@ -61,7 +58,7 @@ GEM
       execjs
     coffee-script-source (1.7.0)
     connection_pool (2.0.0)
-    database_cleaner (1.2.0)
+    database_cleaner (1.3.0)
     diff-lcs (1.2.5)
     erubis (2.7.0)
     execjs (2.0.2)
@@ -74,7 +71,7 @@ GEM
     figaro (0.7.0)
       bundler (~> 1.0)
       rails (>= 3, < 5)
-    formatador (0.2.4)
+    formatador (0.2.5)
     foundation-icons-sass-rails (3.0.0)
       railties (>= 3.1.1)
       sass-rails (>= 3.1.1)
@@ -103,10 +100,9 @@ GEM
       railties (>= 3.0, < 5.0)
       thor (>= 0.14, < 2.0)
     json (1.8.1)
-    kgio (2.8.0)
+    kgio (2.9.2)
-    listen (2.7.4)
+    listen (2.7.5)
       celluloid (>= 0.15.2)
-      celluloid-io (>= 0.15.0)
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)
     lumberjack (1.0.5)
@@ -117,8 +113,8 @@ GEM
     mime-types (1.25.1)
     mini_magick (3.7.0)
       subexec (~> 0.2.1)
-    mini_portile (0.5.3)
+    mini_portile (0.6.0)
-    minitest (5.3.3)
+    minitest (5.3.4)
     mongoid (4.0.0.beta1)
       activemodel (>= 4.0.0)
       moped (~> 2.0.beta6)
@@ -138,11 +134,10 @@ GEM
       bson (~> 2.2)
       connection_pool (~> 2.0)
       optionable (~> 0.2.0)
-    multi_json (1.10.0)
+    multi_json (1.10.1)
     newrelic_rpm (3.8.1.221)
-    nio4r (1.0.0)
+    nokogiri (1.6.2.1)
-    nokogiri (1.6.1)
+      mini_portile (= 0.6.0)
-      mini_portile (~> 0.5.0)
     optionable (0.2.0)
     origin (2.1.1)
     polyglot (0.3.4)
@@ -174,12 +169,12 @@ GEM
       activesupport (= 4.1.1)
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
-    raindrops (0.11.0)
+    raindrops (0.13.0)
-    rake (10.3.1)
+    rake (10.3.2)
     rb-fsevent (0.9.4)
     rb-inotify (0.9.4)
       ffi (>= 0.5.0)
-    redcarpet (3.1.1)
+    redcarpet (3.1.2)
     redis (3.0.7)
     redis-namespace (1.4.1)
       redis (~> 3.0.4)
@@ -213,7 +208,7 @@ GEM
       sass (~> 3.2.0)
       sprockets (~> 2.8, <= 2.11.0)
       sprockets-rails (~> 2.0)
-    sidekiq (3.0.2)
+    sidekiq (3.1.0)
       celluloid (>= 0.15.2)
       connection_pool (>= 2.0.0)
       json
@@ -231,8 +226,8 @@ GEM
       railties (>= 3.0, < 4.2)
       slim (~> 2.0)
     slop (3.5.0)
-    spring (1.1.2)
+    spring (1.1.3)
-    sprockets (2.8.0)
+    sprockets (2.11.0)
       hike (~> 1.2)
       multi_json (~> 1.0)
       rack (~> 1.0)
@@ -255,7 +250,7 @@ GEM
     uglifier (2.5.0)
       execjs (>= 0.3.0)
       json (>= 1.8.0)
-    unicorn (4.6.3)
+    unicorn (4.8.3)
       kgio (~> 2.6)
       rack
       raindrops (~> 0.7)
@@ -298,7 +293,7 @@ DEPENDENCIES
   rqrcode-with-patches
   rspec-rails (>= 2.8.1)
   rspec-sidekiq
-  sass-rails (~> 4.0.2)
+  sass-rails (~> 4.0.3)
   sidekiq
   simple_form
   slim-rails