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Given the following scenario:
(defrecord Person [firstname lastname])
(def some-map (ref {}))
(dosync
(alter some-map conj {1 (Person. "john" "doe")})
(alter some-map conj {2 (Person. "jane" "jameson")}))
To change the firstname of “joe” to “nick”, I do the following:
(dosync
(alter some-map (fn [m]
(assoc m 1
(assoc (m 1) :firstname "nick")))))
What is the idiomatic way of doing this in Clojure?
No need to use update-in, for this case, assoc-in is exactly what you want.
(dosync (alter some-map assoc-in [1 :firstname] "nick"))