node.js - Mongoose findById 查询不返回结果。对象始终为空。

Question

findById 不返回结果。每次我登录时 const course 对象都是 null。

const mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/mongo-exercises', { useNewUrlParser: true });

const courseSchema = new mongoose.Schema({
    name: String,
    author: String,
    tags: [ String ],
    date: Date,
    price: Number,
    isPublished: Boolean
});

const Course = mongoose.model('Course', courseSchema);

async function updateCourse(id){
        const course = await Course.findById(id);
        if(!course) return;

        course.isPublished = true;
        course.author = 'Another Author';

        const result = await course.save();
        console.log(result);
}

updateCourse('5a68fde3f09ad7646ddec17e');

Answer 1

问题已解决。我注意到，当我在 .findById() 更新之前导入集合时；对象的 id 被保存为字符串而不是 ObjectID