title: Adding active_storage to a Rails6 app with Mongoid?
body: <p>I wanted to replace Carrierwave with ActiveStorage in a Rails 6 app that uses Mongoid as storage (and carrierwave-mongoid) but looks like this storage needs an existing Active Record setup. The <code>rails active_storage:install</code> tasks fails. I tried a mongo AR gem adapter with no luck. Is it possible to workaround it? AFAICS it needs to create 2 new tables with some attachments metadata.</p>