What's the closest thing to WaveMaker in ruby/rails world?
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Is there something similar to WaveMaker but that uses the ruby language / is built on top of rails framework?

It has to: 
manage database design (meaning at least creation of custom datatypes in the backend to being able to edit schemas and relationships like in wavemaker),
 
authentication, roles, file uploads, form building (and validation) and optionally visual web page design

Another example could be a very comprehensive cms/cmf (think drupal) but built ontop of rails, so that you could easily extend it and benefit of MVC architecture. 

Wysiwyg webpage design would be a great plus, but it's not a must, I am not asking that much :)

I've tried Locomotive, Webiva(which I think it's the closest thing I found and would be interesting if it wasn't almost dead) - but they all miss the full stack editing capabilities and power of WaveMaker... So.. is there any other big tool that I missed in rails world? Or is this just utopia at the moment? :)

Thanks.