我目前正在解决一个问题，而我的代码允许通过* ngFor更新对象数据，但不允许通过updateOne（）函数进行增补。
基于其他文章，添加修饰符$ set应该可以解决该问题，我已经将其与代码合并，但无济于事。
这是我的代码。
api.js（后端）
router.route('carousel/update/:_id').put(function(req, res) {
db.collection('home').updateOne({"_id": ObjectId(req.params._id)},
{$set: req.body}, {upsert: true}, (err, results) => {
if (err) throw err;
res.send(results)
console.log(results)
console.log(req.params._id)
});
});
为了了解我的代码如何更好地工作，这是将我的api.js连接到我的component.ts的角度服务。
service.ts] >>
updateSlide(id: number, newheader: string, subheader: string){ return this.http.put<any[]>('./api/carousel/update/' + id, {'header': newheader, 'subheader': newsubheader}) }最后是我的component.ts文件。
component.ts
] >>carousels: any = []; updateSlide(id: number){ this.HomeService.updateSlide(id, this.header, this.subheader).subscribe(slides => { this.carousels = slides; console.log(slides) }) }使用上面的代码，当我尝试更新不带_id的对象时，我希望upsert选项可以创建一个新文档。由于我是MEAN的新手，请多多包涵！
EDIT
[console.log(req.body)给我一个{header: 'header', subheader 'subheader'}的结果，它类似于我数据库中的数据。
console.log(results)返回：
result: { n: 1, nModified: 1, opTime: { ts: [Timestamp], t: 1 }, electionId: 7fffffff0000000000000001, ok: 1, operationTime: Timestamp { _bsontype: 'Timestamp', low_: 1, high_: 1571727952 }, '$clusterTime': { clusterTime: [Timestamp], signature: [Object] } }, connection: Connection { _events: [Object: null prototype] { error: [Function], close: [Function], timeout: [Function], parseError: [Function], message: [Function] }, _eventsCount: 5, _maxListeners: undefined, id: 0, options: { host: 'ds259367.mlab.com', port: 59367, size: 5, minSize: 0, connectionTimeout: 30000, socketTimeout: 360000, keepAlive: true, keepAliveInitialDelay: 300000, noDelay: true, ssl: false, checkServerIdentity: true, ca: null, crl: null, cert: null, key: null, passphrase: null, rejectUnauthorized: false, promoteLongs: true, promoteValues: true, promoteBuffers: false, reconnect: true, reconnectInterval: 1000, reconnectTries: 30, domainsEnabled: false, legacyCompatMode: true, disconnectHandler: [Store], cursorFactory: [Function: Cursor], emitError: true, monitorCommands: false, promiseLibrary: [Function: Promise], clientInfo: [Object], servers: [Array], caseTranslate: true, useNewUrlParser: true, auth: [Object], authSource: 'tawebdb', dbName: 'tawebdb', socketTimeoutMS: 360000, connectTimeoutMS: 30000, retryWrites: true, useRecoveryToken: true, readPreference: [ReadPreference], credentials: [MongoCredentials], bson: BSON {} }, logger: Logger { className: 'Connection' }, bson: BSON {}, tag: undefined, maxBsonMessageSize: 67108864, port: 59367, host: 'ds259367.mlab.com', socketTimeout: 360000, keepAlive: true, keepAliveInitialDelay: 300000, connectionTimeout: 30000, responseOptions: { promoteLongs: true, promoteValues: true, promoteBuffers: false }, flushing: false, queue: [], writeStream: null, destroyed: false, hashedName: '09c68a091568e21c31a31a2ad4f8286db4fb6fb3', workItems: [], socket: Socket { connecting: false, _hadError: false, _handle: [TCP], _parent: null, _host: 'ds259367.mlab.com', _readableState: [ReadableState], readable: true, _events: [Object], _eventsCount: 5, _maxListeners: undefined, _writableState: [WritableState], writable: true, allowHalfOpen: false, _sockname: null, _pendingData: null, _pendingEncoding: '', server: null, _server: null, timeout: 360000, [Symbol(asyncId)]: 7, [Symbol(lastWriteQueueSize)]: 0, [Symbol(timeout)]: Timeout { _called: false, _idleTimeout: 360000, _idlePrev: [TimersList], _idleNext: [TimersList], _idleStart: 14489, _onTimeout: [Function: bound ], _timerArgs: undefined, _repeat: null, _destroyed: false, [Symbol(unrefed)]: true, [Symbol(asyncId)]: 1899, [Symbol(triggerId)]: 7 }, [Symbol(kBytesRead)]: 0, [Symbol(kBytesWritten)]: 0 }, buffer: null, sizeOfMessage: 0, bytesRead: 0, stubBuffer: null, ismaster: { hosts: [Array], setName: 'rs-ds259367', setVersion: 1, ismaster: true, secondary: false, primary: 'ds259367-a.mlab.com:59367', me: 'ds259367-a.mlab.com:59367', electionId: 7fffffff0000000000000001, lastWrite: [Object], maxBsonObjectSize: 16777216, maxMessageSizeBytes: 48000000, maxWriteBatchSize: 100000, localTime: 2019-10-22T07:05:40.313Z, logicalSessionTimeoutMinutes: 30, minWireVersion: 0, maxWireVersion: 6, readOnly: false, ok: 1, operationTime: [Timestamp], '$clusterTime': [Object] }, lastIsMasterMS: 227 }, message: BinMsg { parsed: true, raw: <Buffer f5 00 00 00 00 2c e8 09 04 00 00 00 dd 07 00 00 00 00 00 00 00 e0 00 00 00 10 6e 00 01 00 00 00 10 6e 4d 6f 64 69 66 69 65 64 00 01 00 00 00 03 6f 70 ... >, data: <Buffer 00 00 00 00 00 e0 00 00 00 10 6e 00 01 00 00 00 10 6e 4d 6f 64 69 66 69 65 64 00 01 00 00 00 03 6f 70 54 69 6d 65 00 1c 00 00 00 11 74 73 00 01 00 00 ... >, bson: BSON {}, opts: { promoteLongs: true, promoteValues: true, promoteBuffers: false }, length: 245, requestId: 166210560, responseTo: 4, opCode: 2013, fromCompressed: undefined, responseFlags: 0, checksumPresent: false, moreToCome: false, exhaustAllowed: false, promoteLongs: true, promoteValues: true, promoteBuffers: false, documents: [ [Object] ], index: 229, hashedName: '09c68a091568e21c31a31a2ad4f8286db4fb6fb3' }, modifiedCount: 1, upsertedId: null, upsertedCount: 0, matchedCount: 1 }我目前正在解决一个问题，而我的代码允许通过* ngFor更新对象数据，但不允许通过updateOne（）函数进行增补。根据其他帖子，添加...
您必须检查以下条件：
router.route('carousel/update/:_id').put(function(req, res) {
var id;
if(req.params._id === undefined)
{
id = '';. --------> have to careful there should not be any document with id='' in yourDB at any case
} else {
id = ObjectId(req.params._id)
}
db.collection('home').updateOne({"_id": id},
{$set: req.body}, {upsert: true}, (err, results) => {
if (err) throw err;
res.send(results)
console.log(results)
console.log(req.params._id)
});
});