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🐾 Mongoose Cheat Sheet 🚀

Master the essentials of MongoDB object modeling with Mongoose! Level up your backend development skills.

🐾 Mongoose Cheat Sheet 🚀

Connecting to MongoDB

Establish a connection to your MongoDB database using Mongoose.

const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true });

🔌 Establish a connection to your MongoDB instance.

Defining a Schema

Create a schema that defines the structure of your MongoDB documents.

const mongoose = require('mongoose');
const userSchema = new mongoose.Schema({
  name: String,
  age: Number,
  email: String
});

📋 Define the fields and data types for your documents.

Creating a Model

Create a model based on the schema to interact with MongoDB.

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

🔨 Create a model for CRUD operations on 'users' collection.

Inserting Documents

Insert new documents into the collection.

const newUser = new User({ name: 'John', age: 30, email: 'john@example.com' });
newUser.save();

💾 Insert a new document into the 'users' collection.

Querying Documents

Retrieve documents from the collection using queries.

const users = await User.find({ age: { $gt: 25 } });

🔍 Query documents that match certain criteria.

Updating Documents

Update documents using various update methods.

await User.updateOne({ name: 'John' }, { age: 31 });

✏️ Update a document's field(s) in the 'users' collection.

Deleting Documents

Remove documents from the collection.

await User.deleteOne({ name: 'John' });

🗑️ Delete a document from the 'users' collection.

Population (Referencing)

Link documents in different collections using references.

const postSchema = new mongoose.Schema({
  title: String,
  author: { type: mongoose.Schema.Types.ObjectId, ref: 'User' }
});

🔗 Establish a relationship between 'posts' and 'users'.

Middleware

Use middleware functions for pre and post document actions.

userSchema.pre('save', function(next) {
  console.log('Saving a user...');
  next();
});

🛠️ Execute code before or after certain model actions.

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