Is there a non sql active_record db adapter out there?

Hi,

i’m just starting to develop an active_record db adapter for an
in-memory oo database (purple). This will obviously require quite some
work in the Base class of active_record and so I’m wondering if anyone
has done this already?

After some searching I found the ackbar adapter for kirbybase db. And
while I sure will be lifing code from there, I’d really imagine the fit
to be closer (that is anything but the find_by_sql really).

So if anyone can give some helpful starting points, I’d be grateful.
Also general tips and tricks are welcome.

Thanks

Torsten