Ruby >= 2.1 and JRuby are supported. Rubinius should work but isn't actively supported.
This library contains a rule engine written in Ruby. It's based on the Rete algorithm and uses a DSL to express rules in a readable way.
Word of caution: this is complex and fragile machinery, and there may be subtle bugs that are only revealed with nontrivial usage. Be conservative with upgrades, test your rules extensively, and please report any behaviour that is not consistent with your expectations.
The Rete implementation in this library largely follows the outline presented in [Doorenbos, 1995].
git checkout -b my-new-feature)
git commit -am 'Added some feature')
git push origin my-new-feature)