4 files changed, 16 insertions, 2 deletions
diff --git a/actionpack/lib/sprockets/assets.rake b/actionpack/lib/sprockets/assets.rake
index 50278cffcd..0349b2865e 100644
--- a/actionpack/lib/sprockets/assets.rake
+++ b/actionpack/lib/sprockets/assets.rake
@@ -16,7 +16,7 @@ namespace :assets do
   end
 
   desc "Remove compiled assets"
-  task :clean => :environment do
+  task :clean => [:environment, 'tmp:cache:clear'] do
     assets = Rails.application.config.assets
     public_asset_path = Rails.public_path + assets.prefix
     rm_rf public_asset_path, :secure => true
diff --git a/actionpack/lib/sprockets/railtie.rb b/actionpack/lib/sprockets/railtie.rb
index c8438e6043..e1db3c52a3 100644
--- a/actionpack/lib/sprockets/railtie.rb
+++ b/actionpack/lib/sprockets/railtie.rb
@@ -20,6 +20,7 @@ module Sprockets
       app.assets = Sprockets::Environment.new(app.root.to_s) do |env|
         env.static_root = File.join(app.root.join('public'), config.assets.prefix)
         env.logger = ::Rails.logger
+        env.version = ::Rails.env + '-' + config.assets.version
 
         if config.assets.cache_store != false
           env.cache = ActiveSupport::Cache.lookup_store(config.assets.cache_store) || ::Rails.cache
diff --git a/actionpack/test/template/sprockets_helper_test.rb b/actionpack/test/template/sprockets_helper_test.rb
index f4b5344d63..dfa635335e 100644
--- a/actionpack/test/template/sprockets_helper_test.rb
+++ b/actionpack/test/template/sprockets_helper_test.rb
@@ -205,4 +205,17 @@ class SprocketsHelperTest < ActionView::TestCase
     stubs(:asset_environment).returns(assets)
     assert_match %r{/assets/style-[0-9a-f]+.css}, asset_path("style", "css")
   end
+
+  test "alternate hash based on environment" do
+    assets = Sprockets::Environment.new
+    assets.version = 'development'
+    assets.append_path(FIXTURES.join("sprockets/alternate/stylesheets"))
+    stubs(:asset_environment).returns(assets)
+    dev_path = asset_path("style", "css")
+
+    assets.version = 'production'
+    prod_path = asset_path("style", "css")
+
+    assert_not_equal prod_path, dev_path
+  end
 end
diff --git a/railties/test/application/assets_test.rb b/railties/test/application/assets_test.rb
index 802b737483..38dd3f5a3f 100644
--- a/railties/test/application/assets_test.rb
+++ b/railties/test/application/assets_test.rb
@@ -80,7 +80,7 @@ module ApplicationTests
         Dir.chdir(app_path){ `bundle exec rake assets:clean` }
       end
 
-      files = Dir["#{app_path}/public/assets/**/*"]
+      files = Dir["#{app_path}/public/assets/**/*", "#{app_path}/tmp/cache/*"]
       assert_equal 0, files.length, "Expected no assets, but found #{files.join(', ')}"
     end