In Rails 3.2, I provided dynamic customization of multiple tenants' CSS via a mechanism which recompiled the SASS files once a client had updated their color palette, rewrote the manifest file with the updates, then updated Rails.application.config.assets.digests with the new manifest file. With Rails 4, is something like that still possible...i.e. updating the store in Rails which holds the manifest? I was unable to track down where that is data is stored with changes to the asset pipeline. Can someone point me in the right direction? Thanks.