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Jun Jiang
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I've created a demo app with Rails 6 + Webpacker + Bootstrap (with CoreUI), no Sprockets https://github.com/jasl/cybros_core
I created a extendable gem to solve dynamic form problem
https://github.com/rails-engine/form_core
I'm not done doc yet, but It has a full-featured dummy app for evolution that can create forms, fields (including nested fields to support like shopping list), attachment uploading is also support by integrate with ActiveStorage