geta6 · December 18, 2015 06:57 · Dec 18, 2015
diff --git a/actionGenerator.js b/actionGenerator.js
@@ -0,0 +1,36 @@
+import get from 'lodash/object/get';
+import isError from 'lodash/lang/isError';
+import keyMirror from 'fbjs/lib/keyMirror';
+
+export function actionGenerator(displayName, actions) {
+  if (process.env.NODE_ENV === 'development') {
+    Object.keys(actions).forEach(actionName => {
+      if (actions[actionName]) {
+        console.assert(/regeneratorRuntime\.async/.test(actions[actionName].toString()), `${displayName}.${actionName} should be async function`);
+      }
+    });
+  }
+  return Object.assign((context, payload) => {
+    return new Promise(async (resolve, reject) => {
+      const actionType = get(payload, ['type']);
+      try {
+        const action = actions[actionType];
+        if (!action) {
+          reject(new Error(`No action responded to ${displayName}.`));
+        } else {
+          console.info(`execute ${displayName}.${actionType}`);
+          resolve(await action({context, payload}));
+        }
+      } catch (error) {
+        if (isError(error)) {
+          // Normal Error
+          reject(Object.assign(error, {message: `${error.message} (${displayName}.${actionType})`}));
+        } else {
+          // Network Error
+          const message = `${error.status} ${error.statusText}`;
+          reject(new Error(message));
+        }
+      }
+    });
+  }, {displayName, actionTypes: keyMirror(actions)});
+}
diff --git a/exampleItemAction.js b/exampleItemAction.js
@@ -0,0 +1,12 @@
+import get from 'lodash/object/get';
+import axios from 'axios';
+import ItemStore from '../stores/ItemStore';
+
+export default actionGenerator('ItemAction', {
+  async fetchItem({ context, payload }) {
+    const id = get(payload, ['entity', 'item', 'id']);
+    const res = await axios.get(`/api/items/${id}.json`);
+    const item = get(res, ['data', 'data']);
+    context.dispatch(ItemStore.dispatchTypes.SET_ITEM, { item });
+  },
+});