help from https://groups.google.com/forum/?fromgroups=#!topic/datomic/MepE61_Pfuo%5B1-25-false%5D

q.clj

;;rules examples
[[(findname ?person ?search) [(fulltext $ :person/firstname ?search) [[?person ?name]]]] 
 [(findname ?person ?search) [(fulltext $ :person/lastname ?search) [[?person ?name]]]]]

;;attempt at making some rule for searching for geohashs...
[[(findgeohash ?place ?search) 
  [(fulltext $ :coordinate/gehoash ?search) 
   [[?place ?name]]]]]

(defn pythagorean [a b c] (= (+ (* a a) (* b b)) (* c c)))

(defn within-radius [radius ?coord]
  (let [ ]
    (< radius (distance
  )

(q '[:find ?places 
    :in $ $lat $long $radius
    :where 
    [(fulltext :coordinate/gehoash (geohash-partial lat long)]
    [?places :place/geometry ?coords]
    [?coords :geometry/coordinate ?coord]
    [(within-radius $lat $long $radius ?coord)]]
 db lat long radius)

;;may be able to use d/filter function in this senario...
;;https://github.com/Datomic/day-of-datomic/blob/master/tutorial/filter.clj

i really need to test this with clojure. (just wrote this up)