This gem is currently in-development and pre-release.
Anaguma implements a search parser and compiler for converting user-provided searches into queries against a variety of backends, such as ActiveRecord, Sequel, MongoDB, Solr and ElasticSearch.
The user-facing search syntax is similar to the Google search syntax, including boolean logic and infix comparison operators.
FIXME: Add examples showing how to use this thing. :)
Anaguma was designed so that an application can expose a standard search syntax, one that is guaranteed to never return a syntax error to the end-user, in the same way that even a Google search that makes no sense will try and return at least something of value.
This approach also allows for greater flexibility, as you can migrate backends when necessary, or even easily combine inverted indexes or search services with traditional databases. Additionally, because you have complete control over the way backend queries are compiled, you can filter and limit results in a fine-grained fashion.