Database with Mongoose

Mongoose is an Object Data Modeling (ODM) library for MongoDB and Node.js. It provides a straight-forward, schema-based solution to model your application data.

1. Installation & Connection

npm install mongoose

const mongoose = require('mongoose');

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

2. Defining a Schema

Everything in Mongoose starts with a Schema. Each schema maps to a MongoDB collection and defines the shape of the documents within that collection.

const userSchema = new mongoose.Schema({
  name: { type: String, required: true },
  email: { type: String, unique: true },
  age: Number,
  createdAt: { type: Date, default: Date.now }
});

const User = mongoose.model('User', userSchema);

3. CRUD Operations

Mongoose makes interacting with the database very simple using model methods.

// Create
const newUser = await User.create({ name: 'John Doe', email: 'john@example.com' });

// Read
const users = await User.find({ age: { $gte: 18 } });

// Update
await User.findByIdAndUpdate(id, { name: 'Updated Name' });

// Delete
await User.findByIdAndDelete(id);