RethinkDB support through NoBrainer

[mbrock]

Hello. In order to make ActiveAdmin work with RethinkDB and the NoBrainer ORM, I'd like to add NoBrainer support to Ransack. Since @Zhomart added support for Mongoid (#407), there seems to be an extension point for new ORM adapters. Of course, I'll add specs for this, and our organization will (if all goes as planned) use this functionality in production—at least the subset touched by ActiveAdmin. I will fork the project and start working actively in the hopes of getting it working as soon as possible.

[jonatack]

Sure, go for it! @Zhomart did help organizing the Ransack codebase to facilitate adding new adapters. The main caveat with adding RethinkDB, as with Mongoid, is that the current maintainers will likely maintain the Active Record parts of the codebase only, so keeping Mongoid and RethinkDB working will depend on the people who use them actively maintaining them :).

[mbrock]

... on second thought, we will make an attempt to get rails_admin working with NoBrainer instead, since this seems to be a simpler project. Maybe if we outgrow rails_admin, we'll get back to this, but feel free to delete this issue.

[jonatack]

No problem. I have no opinion on RailsAdmin vs ActiveAdmin, having never used them. Good luck!