MongoDB数据填充时title字段显示undefined，求技术排查解决

我用Mongoose定义了ResortSchema，编写seedDB函数填充MongoDB数据，但在mongosh中查询到文档的title字段显示'undefined undefined'。我认为Schema定义正确，怀疑问题出在数组相关逻辑上，已卡多日，请求帮助。相关代码如下：

ResortSchema定义 #

const mongoose = require ('mongoose');
const Schema = mongoose.Schema;
const ResortSchema = new Schema ({
    title: String,
    price: Number,
    descriptor: String,
    places: String,
    location: String
});
var Resortdata = mongoose.model('holidayresorts', ResortSchema);
module.exports = Resortdata;

index.js 填充逻辑 #

const sample = array => array[Math.floor(Math.random() * array.lenght)];
const seedDB = async () => {
    await holidayresorts.deleteMany({});
    for (i = 0; i < 5; i++){
        const random5 = Math.floor(Math.random() * 5);
        const Resort = new holidayresorts ({
            location: `${cities[random5].city} , ${cities[random5].state}`,
            title: `${sample(descriptor)} ${sample(places)}`
        })
        await Resort.save();
    }
}
seedDB();

mongosh查询结果 #

{
  _id: ObjectId("630cecf45a6457bfe74c0b9d"),
  title: 'undefined undefined',
  location: 'Owerri , Imo',
  __v: 0
}

问题原因与修复方案 #

• 数组长度拼写错误：sample函数中array.lenght是拼写错误，正确应为array.length，错误拼写会导致随机索引计算失效，返回undefined。
• 数组变量未定义：代码中未看到descriptor和places数组的定义或引入，直接调用sample(descriptor)和sample(places)必然返回undefined。
• 循环变量未声明：for循环中的i未用let/const声明，会成为全局变量，可能引发意外问题。

修复后的填充逻辑示例：

// 先定义或引入descriptor和places数组
const descriptor = ["奢华", "静谧", "活力", "自然", "复古"];
const places = ["海滩度假村", "山林木屋", "城市酒店", "温泉庄园", "乡村民宿"];
// 确保引入模型和cities数组
const holidayresorts = require('./resortSchema'); // 替换为你的Schema文件路径
const cities = [/* 你的城市数据数组 */];

// 修正sample函数的拼写错误
const sample = array => array[Math.floor(Math.random() * array.length)];

const seedDB = async () => {
    await holidayresorts.deleteMany({});
    // 用let声明循环变量i
    for (let i = 0; i < 5; i++){
        const random5 = Math.floor(Math.random() * 5);
        const Resort = new holidayresorts ({
            location: `${cities[random5].city} , ${cities[random5].state}`,
            title: `${sample(descriptor)} ${sample(places)}`
        })
        await Resort.save();
    }
}
seedDB();

额外注意：需确保holidayresorts模型和cities数组已正确引入，否则location字段也可能出现异常。

内容的提问来源于stack exchange，提问作者jerryson chibueze