Mongoose example with TypeScript

mongoose-node.ts

import { Schema, model, connect, Mongoose } from 'mongoose'

// Animal is an interface describing animal objects
import { Animal } from './animal.js';

const animalSchema = new Schema<WithId<Animal>>({
	_id: ObjectId,    // from WithId
	species: String,  // from Animal
	factoid: String,  // from Animal
	score: Number     // from Animal
})

// Always use the singular form. Mongoose will create a collection in the plural: "Animal" -> "animals"
const AnimalModel = model('Animal', animalSchema)

// This is where we connect to the database. Our models will use this collection. We only need the variable to close the connection.
// The connection string comes from a ".env" file. You can use the same connection string as MongoDB Compass, just add "/database-name" to the end.
const client: Mongoose = await connect(process.env.CONNECTION_STRING!)


// Get documents as an array
// This filter finds all animal documents that have score below 50
let animalsFound: Animal[] = await AnimalModel.find({ score: { $lt: 50 } });

// Add new document
const newAnimal: WithId<Animal> = {
	_id: new ObjectId(),
	species: 'Anaconda',
	factoid: 'Interesting fact...',
	score: 42
}
await AnimalModel.create(newAnimal)

// Delete document
// In this case, delete the first "Snake"
await AnimalModel.deleteOne({ species: 'Snake' })

// Update document
// In this case, find the turtle and change the species to tortoise
const updateFilter = { species: "Turtle" }
const update = { species: "Tortoise" }
await AnimalModel.updateOne(updateFilter, update)


// Don't forget to close the connection when done
client.connection.close()