mapv clojure

(let [change-dish-count (fn [dishes_vec i] (mapv #(if (= i (:menu-item-id %)) (assoc % :count count_d) %) dishes_vec))]
 (mapv #(if (= (:id %) (:active-receipt db))
                                        (update % :dishes change-dish-count (:id dish_map))
                                        %)
                                     vector-of-maps))