Mongoose - trying to update an object in MongoDB, getting error: "object.save is not a function"

Question

I'm trying to update an object that I have in MongoDB using Mongoose, but I am getting the error TypeError: course.save is not a function. I can create and find the 'course' objects just fine.
I've followed instructions in the course exactly and tried to troubleshoot but to no avail!
Any idea what's going on here?

const mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/playground', {
        useNewUrlParser: true
    })
    .then(() => console.log('Connected to MongoDB...'))
    .catch(err => console.error('Could not connect to MongoDB...', err));


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

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

async function createCourse() {
    const course = new Course({
        name: 'Course 1',
        author: 'Mosh',
        tags: ['angular', 'frontend'],
        isPublished: true
    });

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

// createCourse();

async function updateCourse(id) {
    const course = Course.findById(id);
    if (!course) return;
    course.isPublished = true;
    course.author = 'Another Author';    
    const result = await course.save();
    console.log(result);
}

updateCourse('5c1a528838633f2f80379061');

Sparw · Accepted Answer · 2018-12-19 15:08:55Z

2

I Think it is because your find is asynchronous and you cannot using find method without a 'await' like this :

const course = await Course.findById(id);

Hope it helps.

answered Dec 19, 2018 at 15:08

Sparw

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1 Comment

leto Over a year ago

Actually just realised this and was going to delete my question. Thanks!

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