mongo.js

const mongoose = require('mongoose');

mongoose.set('useFindAndModify', false);
mongoose.connect('mongodb://localhost:27017/mongo-demo', { 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: 'Angular Course',
		author: 'Mosh',
		tags: ['angular', 'frontend'],
		isPublished: true
	});

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

async function getCourses() {
	const pageNumber = 2;
	const pageSize = 10;

	const courses = await Course
		.find({ author: 'Mosh', isPublished: true })
		.skip((pageNumber - 1) * pageSize)
		.limit(pageSize)
		.sort({ name: 1 })
		.select({ name: 1, tags: 1 });
	console.log(courses);
}

async function updateCourse(id) {
	const course = await Course.findByIdAndUpdate(id, {
		$set: {
			author: 'Jason',
			isPublished: false
		}
	}, { new: true });
	console.log(course);
}

// updateCourse('5c3873f1b3ebc6256812ce81');

async function removeCourse(id) {
	// const result = await Course.deleteMany({ _id: id })
	const course = await Course.findByIdAndRemove(id);
	console.log(course);
}

removeCourse('5c3873f1b3ebc6256812ce81');