Heroku not picking up autoprefixer config settings

Question

I'm deploying to Heroku and having issues with Heroku not picking up settings in my config/autoprefixer.yml file. When I precompile the assets locally, it works. But when the assets are compiled during slug compilation, only the default autoprefixer settings are in effect.

Am I missing something here?

Answer 1

Here's the response I got from Heroku support which fixed the problem:

This could be a caching issue during slug compilation. Assets are only compiled if the source file has changed, otherwise sprockets will reuse the previously compiled files. To rule this out, can you purge the dyno cache by installing https://github.com/heroku/heroku-repo and running heroku repo:purge_cache -a appname, then redeploy your application with assets set to precompile.