如何处理猫鼬文档版本错误

Question

我在更新同一文档时收到此错误。我不断从套接字获取数据并更新文档。但是最近的数据尚未更新，并且在套接字上发出更新同一文档上的新数据。那么我该如何处理此错误或等待该文档的回调呢？

{ Error
at model.wrappedPointCut [as save] (/var/www/html/parcel-app/node_modules/mongoose/lib/services/model/applyHooks.js:131:29)
at /var/www/html/parcel-app/server/server.js:372:22
at /var/www/html/parcel-app/node_modules/mongoose/lib/query.js:3115:18
at tryCatcher (/var/www/html/parcel-app/node_modules/bluebird/js/main/util.js:26:23)
at Promise._settlePromiseFromHandler (/var/www/html/parcel-app/node_modules/bluebird/js/main/promise.js:510:31)
at Promise._settlePromiseAt (/var/www/html/parcel-app/node_modules/bluebird/js/main/promise.js:584:18)
at Promise._settlePromises (/var/www/html/parcel-app/node_modules/bluebird/js/main/promise.js:700:14)
at Async._drainQueue (/var/www/html/parcel-app/node_modules/bluebird/js/main/async.js:123:16)
at Async._drainQueues (/var/www/html/parcel-app/node_modules/bluebird/js/main/async.js:133:10)
at Immediate.Async.drainQueues (/var/www/html/parcel-app/node_modules/bluebird/js/main/async.js:15:14)
at runCallback (timers.js:800:20)
at tryOnImmediate (timers.js:762:5)
at processImmediate [as _immediateCallback] (timers.js:733:5)
message: 'No matching document found for id "5ae99a15e5e73b39cacafe48"',
name: 'VersionError' }

这是片段

socket.on('sendUserLocation', function(data) {
//when app send new location of user this method will invoked
if (data !== undefined) {
var lat = data.lat;
var lng = data.lng;
var userType = data.user_type;
var roomName = data.room_name;
var heading = data.heading != undefined ? data.heading : 0;
if (userType == 'db') {
var returnBoj = {
lat: lat,
lng: lng,
user_type:'db',
room_name: roomName,
heading: heading, //heading is degree of db boy which will -180-0-180
};
//finding user by room id which is user document id mongoose
DeliveryboyModel.findById(roomName).exec(function (err, DBData) {
if (DBData) {
locationArray = [ parseFloat(lat) , parseFloat(lng) ];
DBData.locationDetails.location = locationArray;
DBData.save(function (err) {
//getting error here
if (err) {
console.log(err);
}
});
}
});
// emmiting addnewmarker so customer app will get new location and will update pin to new location
socket.emit('addnewmarker', returnBoj);
socket.broadcast.to(roomName).emit('addnewmarker', returnBoj);
}
}
});

Answer 1

错误消息暗示它找不到文档，因此如果它是本机查询，请尝试用ObjectId包装它，即ObjectId("507f1f77bcf86cd799439011")。

要回答有关如何等待文档或处理错误的问题，取决于您的数据库驱动程序。例如，如果您使用的是 promised-mongo：

db.collection.update(...).then((doc) => {
// This will run once updated
}).catch((err) => { //handle the error});

阅读更多：https://github.com/gordonmleigh/promised-mongo

或者如果你使用的是 mongodb npm 模块：

db.collection.update({_id: ObjectId('yourId'), {updateKey: 
'updateVal}, (err,val) => {
if(err) //handle it and return
// update finished
return callback(doc);
});

更多详情请见 https://www.npmjs.com/package/mongodb

如果问题仍然存在，请尝试使用标志{upsert: true}设置查询，如此处所述

请记住，传入的套接字消息可能并不总是以发送的相同顺序到达，请正确处理状态或使用队列。