javascript - 聚合不是函数 - Mongoose Nodejs

Question

有人可以帮我解决这个问题吗，这是我从 Mongoose 聚合的代码:

export class GetVehiclesbyKotaCommandHandler {
constructor(namaKota) {
    return new Promise((resolve, reject) => {
        VehiclesDB.find().populate({
            path: 'mitraId',
            model: 'RentalDB',
            select: 'namaKota'
        }).aggregate([
            {
                $match : {
                    namaKota:namaKota
                }
            }
            ]).lean().then((dataVehicles)=>{
            if(dataVehicles !== null){
                resolve(dataVehicles);
            } else {
                reject (new NotFoundException('Couldn\'t find any Vehicles with namaKota' + namaKota));
            }
        }).catch((errDataVehicles)=>{
            reject(new CanNotGetVehiclesException(errDataVehicles.message));
        });
    });
}}

我在控制台上收到这样的错误:

TypeError: _VehiclesDB2.default.find(...).populate(...).aggregate is not a function

完成，我感谢哈娜:)我更改了 mitraId 类型 ObjectId 米特拉ID:{ 类型:Schema.Types.ObjectId， 必填:真实 },

Answer 1

尽量避免此处的查找、填充、精益功能，并按如下方式操作

export class GetVehiclesbyKotaCommandHandler {
constructor(namaKota) {
    return new Promise((resolve, reject) => {
        VehiclesDB.aggregate([
            {
              $lookup: {
                from: 'RentalDB',
                localField: 'mitraId',
                foreignField: '_id',
                as: 'mitra'
              }
            }, {
              $unwind: "$mitra"
            }, {
              $match: {
                "mitra.namaKota": namaKota
              }
            }
          ]).then((dataVehicles)=>{
            if(dataVehicles !== null){
                resolve(dataVehicles);
            } else {
                reject (new NotFoundException('Couldn\'t find any Vehicles with namaKota' + namaKota));
            }
        }).catch((errDataVehicles)=>{
            reject(new CanNotGetVehiclesException(errDataVehicles.message));
        });
    });
}}