clojurescript - Om ref cursor not re-rendering components when updated -

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(ns ^:figwheel-always refs-test.core (:require [om.core :as om :include-macros true]           [om.dom :as dom :include-macros true]           [sablono.core :as html :refer-macros [html]]))  (enable-console-print!)  (def app-state   (atom {:items [{:text "cat"}              {:text "dog"}              {:text "bird"}]      :selected-item {}}))  (defn selected-item []   (om/ref-cursor (:selected-item (om/root-cursor app-state))))  (defn   selected-item-title   [_ owner]   (reify     om/irender     (render [_]       (html         [:div         (let [selected (om/observe owner (selected-item))]           (if (empty? selected)             [:h1 "nothing selected"]             [:h1 (:text selected)]))]))))   (defn   selected-item-button   [item owner]   (reify      om/irender     (render [_]       (html        [:li         [:button {:on-click                   (fn []                     (om/update! (om/root-cursor app-state) :selected-item item)                      ;; doesn't update                     ;;(om/update! (om/root-cursor app-state) :selected-item (merge item {:foo 1}))   ;;                   )} (:text item)]]))))  (defn   root   [cursor owner]   (reify     om/irender     (render [_]       (html        [:div         (om/build selected-item-title {})         [:ul          (om/build-all selected-item-button (:items cursor))]]))))       (om/root root app-state       {:target (.getelementbyid js/document "app")})

(https://www.refheap.com/108491)

the (selected-item) function crerates ref-cursor tracks :selected-item key in app-state. when click selected-item-button title changes reflect new value has been put map. however, works once. pressing different button not cause title re-render again title stuck @ value of first button pressed.

although, adding merge additional keyword seems make work... (merging empty map doesn't work either, tried that!)

is understanding on ref cursors wrong?

so, issue simple.

(om/update! (om/root-cursor app-state) :selected-item item)

should have been

(om/update! (om/root-cursor app-state) :selected-item @item)

notice item, because it's cursor, dereferenced.


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