ruby on rails - Vendor assets not showing in heroku staging environment -

my assets (i.e. css , js) in vendor folders not showing in heroku staging environment, however, images in app/assets/images works , works in development environment though. not want move assets in vendors folder app folder because want keep vendor templates separate.

below setup , list of things have tried:

app/assets/stylesheets/application.css.scss

 *= require_tree .   *= require_self  *= require style.default  

app/assets/stylesheets/application.js

//= require jquery //= require jquery_ujs //= require turbolinks //= require jquery-1.11.1.min //= require jquery-migrate-1.2.1.min //= require jquery-ui-1.10.3.min //= require modernizr.min //= require bootstrap.min //= require jquery.sparkline.min //= require toggles.min //= require retina.min //= require jquery.cookies //= require custom //= require dashboard //= require_tree . 

config/initializers/assets.rb

rails.application.config.assets.precompile += %w( *.css *.js ) 

ran following command in terminal

rails_env=production rake assets:precompile rails_env=staging rake assets:precompile rake assets:precompile heroku run rake assets:precompile 

results pushing heroku using "git push staging master". manifest file detected shown below.

remote:        bundle complete! 35 gemfile dependencies, 85 gems installed. remote:        gems in groups development , test not installed. remote:        bundled gems installed ./vendor/bundle. remote:        bundle completed (1.14s) remote:        cleaning bundler cache. remote:        detected manifest file, assuming assets compiled locally 

environments/staging.rb

config.serve_static_files = true 

environments/production.rb

config.serve_static_files = true 

heroku config

rack_env:                     staging rails_env:                    staging 

gemfile

group :production   gem 'unicorn'   gem 'rails_12factor'   gem 'pg'     gem 'heroku-deflater'   end 

rails version

rails 4.2.0 

ruby version

ruby 2.1.3p242 (2014-09-19 revision 47630) [x86_64-darwin13.0] 

note: "config.assets.compile = true" works, idea precompile assets, not rely on compile

many taking effort @ work.

update

group :production :staging   gem 'unicorn'   gem 'rails_12factor'   gem 'pg'     gem 'heroku-deflater'   end 

adding :staging in gemfile didnt work.

config/application.rb

config.serve_static_assets = true   

adding config.serve_static_assets in application.rb file didnt work..

so further ran following command in staging heroku:

rails.application.config.assets

{:_blocks=>[#<proc:0x007fbbb0bf1558@/app/vendor/bundle/ruby/2.1.0/gems/autoprefixer-rails-5.1.8/lib/autoprefixer-rails/railtie.rb:14>, #<proc:0x007fbbb39ac0d8@/app/vendor/bundle/ruby/2.1.0/gems/sass-rails-5.0.3/lib/sass/rails/railtie.rb:56>], :paths=>["/app/app/assets/images", "/app/app/assets/javascripts", "/app/app/assets/stylesheets", "/app/vendor/assets/fonts", "/app/vendor/assets/javascripts", "/app/vendor/assets/stylesheets", "/app/vendor/bundle/ruby/2.1.0/gems/bootstrap_form-2.2.0/app/assets/stylesheets", "/app/vendor/bundle/ruby/2.1.0/gems/turbolinks-2.5.3/lib/assets/javascripts", "/app/vendor/bundle/ruby/2.1.0/gems/jquery-rails-4.0.3/vendor/assets/javascripts", "/app/vendor/bundle/ruby/2.1.0/gems/coffee-rails-4.1.0/lib/assets/javascripts"], :prefix=>"/assets", :manifest=>nil, :precompile=>[#<proc:0x007fbbb1c00228@/app/vendor/bundle/ruby/2.1.0/gems/sprockets-rails-2.2.4/lib/sprockets/railtie.rb:60 (lambda)>, /(?:\/|\\|\a)application\.(css|js)$/, "*.css", "*.js"], :version=>"1.0", :debug=>false, :compile=>false, :digest=>true, :js_compressor=>:uglifier, :css_compressor=>:sass} 

rails.application.config.assets.precompile

[#<proc:0x007fbbb1c00228@/app/vendor/bundle/ruby/2.1.0/gems/sprockets-rails-2.2.4/lib/sprockets/railtie.rb:60 (lambda)>, /(?:\/|\\|\a)application\.(css|js)$/, "*.css", "*.js"] 

also ran "heroku run rails c" executed following:

irb(main):002:0> puts helper.asset_path("style.default.css") /assets/style.default-84d0516848a763e0b8b8b7005f7ae816.css 

used following debugging method heroku staging:

$ heroku run bash $ ls public/assets 

output below

angular.min-4d194b7f4f12ed8eafec2d7a0c835904.js angular.min-4d194b7f4f12ed8eafec2d7a0c835904.js.gz animate.delay-0faaa57b808dee7f42f39ede364a56fb.css animate.delay-0faaa57b808dee7f42f39ede364a56fb.css.gz animate.min-fa7d9f43baff3065a44d391f5fb24dec.css animate.min-fa7d9f43baff3065a44d391f5fb24dec.css.gz application-30c5d5ea113f5d302dc72bac7a453e2c.js application-30c5d5ea113f5d302dc72bac7a453e2c.js.gz application-76133410c1e24aced49dbeb2178152ad.css application-76133410c1e24aced49dbeb2178152ad.css.gz basketcats-4984b24e5c745a825577436dcb5b1f7d.jpg blogger-icon-5330825185af26ebf796626aab07992f.png bootstrap-07c26bce6cfb4d4d3e91c2a7f3316ddd.js bootstrap-07c26bce6cfb4d4d3e91c2a7f3316ddd.js.gz bootstrap-datetimepicker.min-23b3c4525c36203db02c2000791bc8ee.js bootstrap-datetimepicker.min-23b3c4525c36203db02c2000791bc8ee.js.gz bootstrap-editable-c6281cc109e5208b5848e765b4d14da8.css bootstrap-editable-c6281cc109e5208b5848e765b4d14da8.css.gz 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i not sure if saw this page, had similar issue , helped me out.

i check make sure have config.serve_static_assets = true in config/application.rb

if skip down the debugging section