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You can opt out of loading the library code for views/mailers/etc. Not sure if there's a way to skip the routing layer though. I'm sure you're aware of that already but just in case, you can skip loading the entire framework.

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Use a Sinatra app and include ActiveRecord. There are a few gotchas like making sure to clear connections at the end of requests.

https://stackoverflow.com/questions/41400202/replacing-activ...

I’d love to see more examples of picking pieces of rails and combining with other libraries.

The only concern I have is that because AR isn't designed as a separate gem, there's no guarantees about breaking changes. But I suppose that's unlikely.

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