How to override single files from gem assets for assets:precompile?

Question

Situation

I use a gem that brings its own JavaScript and stylesheet assets. This gem uses a standard application.js and application.css manifest to require all its ass

Answer 1

In application.rb or production.rb, you can prepend or append more assets path.

config.assets.prepend_path 'vendor/assets/jquery'
config.assets.append_path 'vendor/assets/something'

References:

• sprockets/railtie source code
• Sprockets: Manipulating the Load Path

Answer 2

In the demo code you posted at on GitHub, your application.js has:

//= require any_gem

That does not bring in a directory, it brings in any_gem.js, which is the Gem's manifest file that brings in all of the Gem's JS files. If you do not want all of the files, then you need to change that to bring in only the files you want by listing them explicitly:

//= require ../../../vendor/assets/javascripts/any_gem/do_not_override.js

Then you can add back in all of your own JS files, including your overrides, with:

//= require_tree .

BTW, great job on creating the demo app! You're a role model for the kids.