Clojure: How to Hook into Defrecord Constructor -

the title of question may on specify implementation, idea simple, want create , record, or similar, map type declared deftype, etc... want create object string id , int age, want convert id uuid , age int if not already. how do idiomatically?

so far have this:

(let [item (my.model/map->item {     :id (uuid/fromstring "62c36092-82a1-3a00-93d1-46196ee77204")      :age (int 6)})])  

but dont want both of operations every time create item, want logic in 1 place. make auxiliary function this, there built in support in deftype or defrecord?

it's easiest use function takes input map , constructs item that.

(defn make-item   [{:keys [id age] :as input}]   {:pre [(string? id)          (number? age)]}   (-> input       (update-in [:id] #(uuid/fromstring %))       (update-in [:age] int)       my.model/map->item)) 

this scale nicely need more keys or stricter constraints, , adapts other record types.