http://www.reinteractive.net/posts/116-12-tips-for-the-rails-asset-pipeline
- Every file that is not a Javascript file or CSS file that is in the app/assets folder will be copied by Rails into the public/assets folder when you compile your assets.
- config.assets.compile
- If it is set to "true" (which it is by default in development) then Rails will try to find a Javascript or CSS file by first looking in the public/assets directory and if it can't find it, will hunt through your app/assets folder looking for the file. If it finds it in app/assets it will go ahead and compile on the fly and then serve this asset up.