[Rails] Expose complex dynamic queries over REST

I'm trying to build a web application for data analysis. The client can send ad-hoc queries to my back-end data service. For example:

(foo >= 10 OR bar == 'baz') AND bat < 10

Is there a rails/activerecord standard for sending this type of query through REST? A DAO / method_missing won't work because there are an infinite number of permutations per model (e.g. an arbitrary number of attributes, clauses, etc). Is there something that could take a "Lucene-like" query string and construct an activerecord request? Or do I just have to manually parse it myself?

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