correct way to handle path change between webpack and rails

Hey guys,
I am currently working with this project https://github.com/spark-solutions/spark-starter-kit
which is heavily inspired by your project. One issue I'm having is that I can't figure out how to correctly handle the issue between the rails path and the webpack path for assets.

For example in webpack dev server the path is loaded successfully like this:
http://localhost:3500/6b4fec0f21ce52aebc80204c2d5c4849.png

but when you try to load it up in production it no longer works because the rails path is:
http://localhost:3000/assets/6b4fec0f21ce52aebc80204c2d5c4849.png

but its still trying to load the path like this:
http://localhost:3000/6b4fec0f21ce52aebc80204c2d5c4849.png

which yields a 404.

Thank you!