gistfile1.clj

;; Multimethod for transforming data based on the name of the source mongodb collection 
(defmulti transform identity)

(defmethod transform "events" [data]
   ;; do something with data
 )

(defmethod transform "users" [data]
   ;; do something with data
 )

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(defprotocol Collection-Transformer
   (transform [mongo-db document]))

(def user-transformer
 (reify Collection-Transformer
  (transform [m d] "do stuff")))