I am deploying a Rails 4.0 application which includes HTML partial templates as assets for our front-end javascript framework. Although these templates are part of the asset pip
I'm pretty new to this stuff, but to get the asset_path to work, don't you need a .erb on the end of that file?
Check out the bottom of this article for more info:
https://devcenter.heroku.com/articles/rails-4-asset-pipeline
If it works in development, that may not help. There is a helpful section on debugging at the bottom of the article though.
Update
Here's another article that could help:
https://medium.com/self-directed-learning/9ba1f595102a
Flipping on this configuration in Heroku made some of my asset pipeline problems go away:
heroku labs:enable user-env-compile -a yourapp
Hope this helps!
Alex