Clojurescript/Reagent 处理错误

Question

我们开始将 Clojuescript/Reagent 用于我们产品的下一个开发阶段。基本上我们需要一种方法，在原子上做一个单一的操作，我们想出了一个方法，比如： (def app-state (r/atom {}))

(defn select [index]
    (swap! app-state
       #(-> %
            (assoc-in [:storyboard :pages 0 :layers 0 :children 0 :is_selected] true)
            (assoc-in (GET ....)) ;; ajax call
            (assoc-in [:selected :selected_tab] "tab_properties")
            (assoc-in [:selected :page_object_cursor] [0])
         )))

基本上交换得到一个函数，其中所有需要的操作都被链接起来。太棒了。但是，我正在寻找处理错误的方法。我想有一个单独的错误原子：

(def errors (r/atom []))

并且当发生错误时，捕获它并将其添加到错误中，而不交换应用程序状态（应用程序保持在最后的稳定状态）。所以我们使用 throw from the chain 和一个 try cactch

(defn change-title [title]
  (try
    (swap! app-state
       #(-> %
            (assoc :text title)
            ((fn [state] 
               (throw "there is an error")))
            ))
    (catch js/Object e
      (swap! errors conj e))))

所以我希望错误被捕获，并且@errors 拥有它。但现实是：

*未捕获有错误

weather_app$core$change_title @core.cljs?rel=1450266738018:59（匿名函数）@core.cljs?rel=1450266738018:108executeDispatch @react-with -addons.inc.js:3311SimpleEventPlugin.executeDispatch @react-with-addons.inc.js:17428forEachEventDispatch @react-addons.inc.js:3299executeDispatchesInOrder @react-addons.inc.js:3320executeDispatchesAndRelease @react -with-addons.inc.js:2693forEachAccumulated @react-with-addons.inc.js:19430EventPluginHub.processEventQueue @react-with-addons.inc.js:2900runEventQueueInBatch @react-addons.inc.js:11217ReactEventEmitterMixin.handleTopLevel @react-with-addons.inc.js:11243handleTopLevelImpl @react-with-addons.inc.js:11329Mixin.perform @react-with-addons.inc.js:18402ReactDefaultBatchingStrategy.batchedUpdates @react -with-addons.inc.js:9669batchedUpdates @react-with-addons.inc.js:16633ReactEventListener.dispatchEvent @react-with-addons.inc.js:11423*

Answer 1

(catch :default e
  (swap! errors conj e))))

因为抛出的字符串不是对象，而是字符串！

Clojurescript/Reagent 处理错误

Clojurescript/Reagent handling errors

error-handling

clojurescript

om

reagent