使用 javascript 中的 findByID 从 MongoDB 获取 null ObjectID - 新手

Question

I am new to javascript and mongo and trying to find a course in my MongoDB database collection using id but getting null. Could you please help me with this?

Note: I am using MacBook. This is a very basic thing I am trying to do. I am able to fetch the object using.find() but findByID(id) doesn't seem to work for me. What am I missing? Let me know if any more detail is required.

Edit: A weird observation, refer the image . For the first one, I cannot find it or update it using id but I could find and update the second one. The first one was inserted in database using json file and second one was inserted using.save() in javascript.

PFB my code:

const mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/mongo-exercise', { useNewUrlParser: true, useUnifiedTopology: true })
    .then(() => console.log('Connected to mongo-exercise database.'))
    .catch(err => console.log('Could not connect to mongo-exercise database.', err));

// Create the schema
const schema = new mongoose.Schema({
    name: String,
    author: String,
    price: Number,
    tags: [String],
    isPublished: Boolean
});

// Call the schema
const Course = mongoose.model('course', schema);

async function updateCourse(id) {
    try {
        const course = await Course
            .findById(id);
        console.log('Course is ', course);
    }
    catch (err) {
        console.log('Solution failed: ', err.message);
        throw error
    }
}

updateCourse("5a68fdf95db93f6477053ddd");

[ ]

Answer 1

Happened to me.when importing using compass, just deselect the _Id property as its a string. When imported mongodb driver will put in a new object _id with and objectid that can be queried.