The thing about OpenResty is that you can do most of it on your own without a framework at all. If you don't need all the (it's not really that much) stuff Lapis comes with, you could just require the modules you do need with Luarocks or OPM in a route and handle things that way. It's just Lua. If you don't want to use Lapis's ORM though, you could just not do it though. AND Lapis in vanilla Lua isn't especially OO, it looks a lot like Express/Sinatra.
