Migrate from Sprockets to Propshaft

[mpalenciano]

Hi there,

We have upgraded to Rails 8, and migrated from Sprockets to Propshaft for the assets, but now when we deploy to Heroku the task "assets:precompile" is run always, despite having config.assets.compile = false.

Looking to the code in your ruby buildpack the assets will not be compile if a (sprockets) 'manifest' file exits in 'public/assets/' dir.
Since we don't use Sprockets now we don't have a 'manifest' file anymore in our repo, that's the reson the assets compile run.

heroku-buildpack-ruby/lib/language_pack/rails4.rb

Line 64 in de38337

if Dir.glob("public/assets/{.sprockets-manifest-*.json,manifest-*.json}", File::FNM_DOTMATCH).any?

if Dir.glob("public/assets/{.sprockets-manifest-*.json,manifest-*.json}", File::FNM_DOTMATCH).any?
  puts "Detected manifest file, assuming assets were compiled locally"
  return true
end

Is there an alternative way to not run the assets using this buildpack? or will you adapt the code for when not using Sprockets? meanwhile the solution we found is writing a dummy/empty public/assets/manifest-heroku.json. But when running "assets:clobber" it gets deleted and we have to create it again.

Please, excuse me if I am wrong

Thank you and regards.