ruby on rails - File digest/fingerprint is not always included in asset files -

i precompile assets , use following function render html:

= stylesheet_link_tag "frontend/application", media: "all", "data-turbolinks-track" => true = javascript_include_tag "frontend/application", "data-turbolinks-track" => true 

sometimes methods generat correct html:

<link data-turbolinks-track="true" href="/assets/frontend/application-64cf06dd4d2386f145e00844fed60d28.css" media="all" rel="stylesheet" /> <script data-turbolinks-track="true" src="/assets/frontend/application-447281961c979f73e944369c4b832fd8.js"></script> 

but on production rails (50%!) generates assets html this

<link data-turbolinks-track="true" href="/stylesheets/frontend/application.css" media="all" rel="stylesheet" /> <script data-turbolinks-track="true" src="/javascripts/frontend/application.js"></script> 

i use heroku on production. idea wrong or how can fix this?

below production settings.

  # disable rails's static asset server (apache or nginx this).   config.serve_static_assets = true    # debug mode disables concatenation , preprocessing of assets.   # option may cause significant delays in view rendering large   # number of complex assets.   config.assets.debug = true    # compress javascripts , css.   config.assets.js_compressor = :uglifier   config.assets.css_compressor = :sass    # not fallback assets pipeline if precompiled asset missed.   config.assets.compile = false    # generate digests assets urls.   config.assets.digest = true    # version of assets, change if want expire assets.   config.assets.version = '2'    # specifies header server uses sending files.   # config.action_dispatch.x_sendfile_header = "x-sendfile" # apache   # config.action_dispatch.x_sendfile_header = 'x-accel-redirect' # nginx 

here preview of problem: view-source:http://v5.megabon.com/en

the way work on heroku set compile false

config.assets.compile = false  

and delete every precompiled file in public folder. forces heroku recompile assets on every git push.