Ask HN: Favorite RAD/CRUD system?

I have to knock up a lot of admin systems. Over the years I've used PHP, RoR and Django. But in order to improve the user experience I'd like to use a SPA (in EmberJS, Angular or React+something) for the UI. All frameworks have a datagrid, custom input fields etc - but I've seen no unified system for quickly building datagrid + crud. Or for handling file uploads when editing a record. Or quick mapping for linked records in an autocomplete field (like Django did in 2006). Is there a great JS frontend CRUD framework you've used? And is there a great CRUD/RAD system in any language for the web? Bonus Q: What is your favourite RAD/CRUD system/framework EVER?