x1c 0d1x这是我的firestore（模拟器）看起来像
我正在尝试使用firebase模拟器来练习学习云函数，然而，我遇到这种情况的次数可能比我预期的要多，我希望这是我的问题。
我试着写一个函数，当用户发出https请求创建订单时，后台触发函数会将总量（数量 * 价格）返回给用户，后面的部分目前还是在制品;我目前只是试图了解和学习更多关于云功能。
这是https请求代码，我必须将项目，价格和数量添加到我的firestore。它工作得很好，并按照预期。

exports.addCurrentOrder = functions.https.onRequest(async (req, res) => {
 const useruid = req.query.uid;
 const itemName = req.query.itemName;
 const itemPrice = req.query.itemPrice;
 const itemQuantity = req.query.itemQuantity;
 console.log('This is in useruid: ', useruid);
 const data = { [useruid] : {
   'Item Name': itemName,
   'Item Price': itemPrice,
   'Item Quantity': itemQuantity,
 }};
 const writeResult = await admin.firestore().collection('Current Orders').add(data);
 res.json({result: data});
});

这是给我各种错误的部分：

exports.getTotal = functions.firestore.document('Current Orders/{documentId}').onCreate((snap, context) => {
  const data = snap.data();
  for(const i in data){
    console.log('This is in i: ', i);
  }
  return snap.ref.set({'testing': 'testing'}, {merge: true});
});

每当我有这个，控制台总是会给予我：

functions: Error: 2 UNKNOWN: 
at Object.callErrorFromStatus (/Users/user/firecast/functions/node_modules/@grpc/grpc-js/build/src/call.js:30:26)
at Object.onReceiveStatus (/Users/user/firecast/functions/node_modules/@grpc/grpc-js/build/src/client.js:175:52)
at Object.onReceiveStatus (/Users/user/firecast/functions/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:341:141)
at Object.onReceiveStatus (/Users/user/firecast/functions/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:304:181)
at Http2CallStream.outputStatus (/Users/user/firecast/functions/node_modules/@grpc/grpc-js/build/src/call-stream.js:116:74)
at Http2CallStream.maybeOutputStatus (/Users/user/firecast/functions/node_modules/@grpc/grpc-js/build/src/call-stream.js:155:22)
at Http2CallStream.endCall (/Users/user/firecast/functions/node_modules/@grpc/grpc-js/build/src/call-stream.js:141:18)
at Http2CallStream.handleTrailers (/Users/user/firecast/functions/node_modules/@grpc/grpc-js/build/src/call-stream.js:273:14)
at ClientHttp2Stream.<anonymous> (/Users/user/firecast/functions/node_modules/@grpc/grpc-js/build/src/call-stream.js:322:26)
at ClientHttp2Stream.emit (events.js:210:5)
Caused by: Error
at WriteBatch.commit (/Users/user/firecast/functions/node_modules/@google-cloud/firestore/build/src/write-batch.js:415:23)
at DocumentReference.create (/Users/user/firecast/functions/node_modules/@google-cloud/firestore/build/src/reference.js:283:14)
at CollectionReference.add (/Users/user/firecast/functions/node_modules/@google-cloud/firestore/build/src/reference.js:2011:28)
**at /Users/user/firecast/functions/index.js:43:76** 
at /usr/local/lib/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:593:20
at /usr/local/lib/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:568:19
at Generator.next (<anonymous>)
at /usr/local/lib/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:8:71
at new Promise (<anonymous>)
at __awaiter (/usr/local/lib/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:4:12)
⚠  Your function was killed because it raised an unhandled error.

即使我注解掉我认为给我错误的函数，我仍然会遇到这个问题（当我运行官方云函数指南上找到的示例函数时也是如此！）
我知道我在后台触发器上肯定做错了什么（希望有人能好心教我如何写这样的函数/让我开始）
我做错了什么？还是这是某种模拟器的错误？