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divs1210/watch_db.cljs

Created December 14, 2018 11:26
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Lightweight logging of db state changes for reagent/re-frame
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watch_db.cljs
(defn watch-db []
(add-watch re-frame.db/app-db :watcher
(fn [_ _ old-state new-state]
(let [[removed added] (clojure.data/diff old-state new-state)]
(when (or removed added)
(println "=====\nRemoved:")
(cljs.pprint/pprint removed)
(println "Added:")
(cljs.pprint/pprint added))))))
(defn unwatch-db []
(remove-watch re-frame.db/app-db :watcher))
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