rails 4 not using digests in asset filenames, but only in production

问题

The bounty expires in 2 days. Answers to this question are eligible for a +100 reputation bounty. stevec wants to draw more attention to this question:

I have a similar problem (albeit slightly less complicated) here: stackoverflow.com/questions/65990841/… Basically assets aren't being given their full url (with digest) in production, so they simply aren't working. The urls are generated in the controller, and image_url() doesn't seem to return the same result from the controller as it does from the view. TL;DR, I'm generating a url to an image from the controller, and it must contain the digest, but in production, it doesn't. And I can't work out why.

I have a Rails 4 app that was recently heavily upgraded (in terms of gem versions and some other things). Deploys have been working fine, but once we cleared out our tmp directories we noticed that assets stopped working in production. What's happening is for some reason in production mode, the helpers aren't using digests in any of the asset filenames (e.g. /javascripts/application.js instead of /javascripts/application-some-digest.js). This causes those assets to 404, since they do exist with their proper digest names in the public directory and Google App Engine is set up to independently serve static files for the public directory (which has always worked fine). What is really strange, though, is that in staging mode, the app is doing everything properly, so there is something about our production environment that is making the helpers not use digests.

Even weirder, though, is if I go RAILS_ENV=production rails console and do helper.asset_path 'application.js' I get the proper filename with the digest. What on earth could be going on?

And yes, we are doing RAILS_ENV=production rake:assets:precompile before deploying.

Here are the relevant parts from config/environments/production.rb:

  config.eager_load = true
  config.assets.cache_store = :dalli_store
  # Don't force SSL because we need non-ssl cookies.
  config.force_ssl = false
  config.stripe_livemode = true
  config.assets.digest = true
  config.assets.compile = false

Here are the relevant parts from config/environments/shared.rb:

  # Disable Rails's static asset server (Apache or nginx will already do this)
  config.serve_static_files = false

  # Compress JavaScripts and CSS
  config.assets.compress = true

  # Don't fallback to assets pipeline if a precompiled asset is missed
  config.assets.compile = false

  # Generate digests for assets URLs
  config.assets.digest = true

  # Precompile additional assets (application.js, application.css, and all
  # non-JS/CSS are already added)
  config.assets.precompile += ['zxcvbn.js', 'hammer.min.js', 'jquery.ba-throttle-debounce.min.js', 'mediaCheck.js', 'application-no-mq.css', 'lte-ie7.js', 'mailcheck.js', 'browserconfig.xml', 'main.css', 'oamm.js', 'oamm.min.js']

Here are the relevant parts from config/application.rb:

    config.assets.precompile += %w( *.js ^[^_]*.css *.css.erb )

    # Enable the asset pipeline
    config.assets.enabled = true

    config.log_level = :info

    config.assets.precompile += ['rails_admin/rails_admin.css', 'rails_admin/rails_admin.js']

    # Version of your assets, change this if you want to expire all your assets
    config.assets.version = '1.0'

And finally, here are the relevant parts from config/environments/staging.rb which is somehow working fine:

  # Speed up asset compilation on Heroku.
  config.assets.cache_store = :dalli_store
  config.eager_load = true

  config.stripe_livemode = false

来源：https://stackoverflow.com/questions/60212729/rails-4-not-using-digests-in-asset-filenames-but-only-in-production