无法通过填充mongoose来显示数据

Please Help me, i want to show Vehicles(VehiclesDB) data using populate by select CityName(namaKota) from Schema Partner(RentalDB) in mongoodb, with NodeJs.. here my code

请帮助我，我想显示车辆（VehiclesDB）数据使用填充来自mongoodb中Schema Partner（RentalDB）的选择CityName（namaKota），使用NodeJs ..这里是我的代码

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

}

}

my Vehicles Collection Structure

我的车辆收集结构

My Partner(Mitra) Collection Structure

我的合作伙伴（Mitra）收藏结构

But My Response is Succes and Don't Show Anything

但我的回应是成功的，不要表现出任何东西

{
"success": true,
"status": 200,
"message": "Successfully get kendaraan by mitraId!",
"error_code": null,
"data": []

}

}

1 个解决方案

#1

I am going to take a wild guess from looking at your images (better if you edit your question with your schemas) that there is a mismatch with type of mitraId field in your Vehicles collection and _id in your Partners collection.

我将通过查看您的图片（如果您使用您的模式编辑问题更好）进行疯狂猜测，即您的Vehicles集合中的mitraId字段类型与您的Partners集合中的_id不匹配。

The former is a String whereas the latter is an ObjectID. They need to be the same type in order to populate.

前者是String，后者是ObjectID。它们需要是相同的类型才能填充。