Rails 5.1 & webpacker require clearing cache before every deploy

[flybayer]

A deploy will fail to on assets:precompile without any errors in STDOUT or the build log.

remote:        Webpacker is installed 🎉 🍰
remote:        Using /tmp/build_c3975d9e573c1bf0b4e6b532daa48fde/config/webpack/paths.yml file for setting up webpack paths
remote:        Compiling webpacker assets 🎉
remote:  !
remote:  !     Precompiling assets failed.
remote:  !
remote:  !     Push rejected, failed to compile Ruby app.
remote: 
remote:  !     Push failed
remote: Verifying deploy....
remote: 
remote: !	Push rejected to [my app].

Workaround

Run heroku repo:purge_cache -a [app] before every deploy

See #561 for more history

/cc @hone

[Zeneixe]

We're having the same issue

[schneems]

Can you open up issues help.heroku.com search for "Rails 5.1 & webpacker require clearing cache before every deploy", so that I can look at your app?

Right now I've got no idea why this is happening. I've seen a few apps with with this reported, but no definitive causes or solutions yet. I opened rails/webpacker#395 an I'm exploring ways to get more debug output with the command.

[flybayer]

@schneems I'm actually using this with dokku instead of Heroku

[flybayer]

Update: node-sass was my problem even though there was no logging indicating this.

Adding

"postinstall": "npm rebuild node-sass"

to my package.json scripts as suggested in rails/webpacker#395 has fixed all my deployment problems.

I no longer need to clear the cache before every deploy.