节点js函数onWrite在谷歌云功能中无法正常工作 [英] node js function onWrite is not working properly in google cloud function

问题描述

我有这个节点 js 函数，一旦对节点列表进行添加/更新/删除，它就会尝试更新 Algolia 索引

I have this node js function that attempts to update Algolia index once a add/update/delete is done to node Listings

exports.indexlisting_algolia = 
    functions.database.ref('/Listings/{listingId}').onWrite((snapshot, context) => {
   const index = algolia.initIndex('Listings');
   // var firebaseObject = snapshot.data;
   var firebaseObject = snapshot.data.val();
   console.log("test ",firebaseObject)

   firebaseObject.objectID = context.params.listingId;


  return index.saveObject(firebaseObject).then(
  () => 
   snapshot.data.adminRef.parent.child('last_index_timestamp').set(
      Date.parse(event.timestamp)));
  });

这是我的错误 thraceback

this is my error thraceback

TypeError:无法读取未定义的属性val"在exports.indexlisting_algolia.functions.database.ref.onWrite (/user_code/index.js:807:40)在对象.(/user_code/node_modules/firebase-functions/lib/cloud-functions.js:112:27)在下一个(本机)在/user_code/node_modules/firebase-functions/lib/cloud-functions.js:28:71在 __awaiter (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:24:12)在 cloudFunction (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:82:36)在/var/tmp/worker/worker.js:733:24在 process._tickDomainCallback (internal/process/next_tick.js:135:7)

TypeError: Cannot read property 'val' of undefined at exports.indexlisting_algolia.functions.database.ref.onWrite (/user_code/index.js:807:40) at Object. (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:112:27) at next (native) at /user_code/node_modules/firebase-functions/lib/cloud-functions.js:28:71 at __awaiter (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:24:12) at cloudFunction (/user_code/node_modules/firebase-functions/lib/cloud-functions.js:82:36) at /var/tmp/worker/worker.js:733:24 at process._tickDomainCallback (internal/process/next_tick.js:135:7)

第 807 行是这个函数

line 807 is this function

var firebaseObject = snapshot.data.val();

我做错了什么，我该如何解决?

what am I doing wrongly and how can I fix this?

推荐答案

您使用的是由 firebase-functions 模块公开的旧版本 API.新版本要求您接受 Change 对象，具有 before 和 after 属性，作为 onWrite 和 onUpdate 触发器的第一个参数.这些属性将是 DataSnapshot 对象.您的代码当前需要一个 DataDeltaSnapshot，这是您在完整 1.0 版本之前的 beta 版本中获得的.现在已弃用.

You're using an old version of the API exposed by the firebase-functions module. The new one requires that you accept a Change object, with before and after attributes, as the first parameter of onWrite and onUpdate triggers. Those attributes will be DataSnapshot objets. Your code is currently expecting a DataDeltaSnapshot, which is what you got in the beta version before the full 1.0 release. This is now deprecated.

您可以在文档中了解 1.0 版中的 API 更改.

You can read about the API changes in version 1.0 in the documentation.

有关示例，另请参阅数据库触发器文档.

你的函数应该看起来更像这样:

Your function should look more like this:

exports.indexlisting_algolia = 
    functions.database.ref('/Listings/{listingId}')
    .onWrite((change, context) => {
        const before = change.before;  // snapshot before the update
        const after = change.after;    // snapshot after the update
        const before_data = before.val();
        const afater_data = after.val();
    })

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