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I 2nd https://jumpstartrails.com . I purchased the "Unlimited Site License", and it is well worth it.

I wish there was something like this ready in Noode.js world (happy to pay)

Probably more than that one.

Intereting. I've been thinking about doing something like this with Python (Flask/Django), albeit a bit more general.

I work on https://www.saaspegasus.com/ as a similar project for Django. Let me know if you have any questions!

For the unfamiliar, OP makes awesome Rails tutorial videos and is really knowledgeable on the subject.