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Comment by tinco | Hacker News Reader

It seems you are right, my apologies, I clearly hadn't read deep enough. Still, Sequel is just an SQL abstraction. DataMapper is exactly what Lotus::Model is, a full model abstraction over databases, regardless of the querying language.

Some years ago I even implemented an XQuery querying backend for DataMapper, it was not much work at all, at a time where AR still had SQL code all through the base and Sequel was just in low profile development.

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> It seems you are right, my apologies, I clearly hadn't read deep enough. Still, Sequel is just an SQL abstraction. DataMapper is exactly what Lotus::Model is, a full model abstraction over databases, regardless of the querying language.

AFAICT from reading the Sequel code (and especially the code for the existing adapters), there's no real hard dependency on SQL (since the adapter both generates and applies the query string), though there is a dependency on being able to map back and forth to SQL-like operations.

It shouldn't be impossible to write a driver for a non-SQL backend for Sequel, though it seems like it would be progressively harder the farther from the assumptions common to SQL its operation was.

Correct, it's not impossible, there was a proof of concept mongo driver: https://github.com/jeremyevans/sequel-mongo . I doubt it still works with current Sequel, though, as I only coded it for a lightning talk in 2010.

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