Model
- Node.js course
- Advanced
- Lesson 27/83
- 5 min
Learn CRUD operations with Mongoose Model.
What is a Model?
A Model is a document class built from a blueprint. You do database operations (create, find, update, delete) through this class. The Model is Mongoose's most-used API.
Creating a model: const User = mongoose.model("User", blueprint). The first parameter is the collection name (pluralized), the second is the blueprint. After creating you make documents with new User({...}) and query with User.find().
Creating a model
To create a model you call mongoose.model(name, definition). name sets the collection name (Mongoose auto-pluralizes: "User" becomes "users"). definition is the blueprint object.
You define a model once; then you use it everywhere in the app. Defining the same name twice throws an error. The model lives in memory; you do not need to require it again. This is Mongoose's singleton pattern.
Practice Log the type of the model
Import mongoose. Create a model with mongoose.model("User", { name: String }). Log typeof User.
Starter code
// import the module
// create a model
// log its typeSample solution
const mongoose = require("mongoose");
const User = mongoose.model("User", { name: String });
console.log(typeof User);Expected output
function
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 Match each piece to its role
| Term | Meaning |
|---|---|
mongoose.model |
Creates a model |
Model |
Document class |
new Model() |
New document |
Model.find() |
Finds documents |
2 Complete the method name
const User = mongoose.____("User", { ad: String })const User = mongoose.model("User", { ad: String })Explanation: mongoose.model("User", ...) returns a Model class.
3 What does mongoose.model() return?
- Bir dize
- A number
- A Model class Correct answer
- Bir Promise
Explanation: mongoose.model() returns a Model class.