monger.conversion documentation

as-field-selector

(as-field-selector input)
Converts values to DBObject that can be used to specify a list of document fields (including negation support)

from-db-object

(from-db-object input keywordize)
Converts given DBObject instance to a piece of Clojure data

to-db-object

(to-db-object input)
Converts given piece of Clojure data to BasicDBObject MongoDB Java driver uses

to-object-id

(to-object-id input)
Instantiates ObjectId from input unless the input itself is an ObjectId instance. In that case, returns input as is.