我如何获取和填充订单的ID引用？我获取产品和用户的ID。然后，当我使用GET方法时，我将获得产品和用户的所有详细信息。
例如，我的数据将显示所有信息

产品A.标题B.价格c.产品图像
用户a.用户名b.StudentID

我试图使用Popate，但我认为我这样做是错误的。

export const getOrders = async (req,res) =>{
      try {
      const order = await Order.findOne({productId: '634e91d256326381d5716993'})
                                .populate()
                                .exec()
      res.status(400).json(order)
    } catch (error) {
            res.status(404).json({message: error.message})  
    }
       }

OrderSchema

const OrderSchema = mongoose.Schema({
        productId: {type:  mongoose.Schema.Types.ObjectId, ref: 'Product', required: true},
        buyerId: {type: mongoose.Schema.Types.ObjectId, required: true, ref: 'User'},
        sellerId: {type: mongoose.Schema.Types.ObjectId, required: true, ref: 'User'}

    })

    export default mongoose.model('Order', OrderSchema)

Product架构

const ProductSchema = mongoose.Schema({

        user_id: {type: mongoose.Schema.Types.ObjectId, required: true, ref: 'User'},
        title: {type: String},
        description: {type: String},
        categories: {type: Array},
        price: {type: Number},
        productImage: {type: String}
    },
    { timestamps: { createdAt: true } }
     )

    export default mongoose.model('Product', ProductSchema)

用户架构

const UserSchema = mongoose.Schema({
        username: {type: String, unique: true, required: true},
        password: {type: String,  required: true},
        email: {type: String,  unique: true, required: true},
        studentid: {type: String, unique: true, required: true},
        isAdmin:{type: Boolean, default: false},
        },
       { timestamps: { createdAt: true } }
        )

    export default mongoose.model('User', UserSchema)