Mongoose Schemas Aliases

Mongoose is a MongoDB object modeling and handling for a node.js environment. Mongoose Schemas Aliases help in converting a short property name in the database into a longer, more verbal, property name to enhance code readability. 

Creating node application And Installing Mongoose:

Step 1: Create a node application using the following command:

mkdir folder_name
cd folder_name
npm init -y

Step 2: After creating the ReactJS application, Install the required module using the following command:

npm install mongoose

Project Structure: It will look like the following.

Example 1: In this example, we will create a “name” alias for the “n” property in mongoose schema. 

Filename: main.js

Javascript

const mongoose = require('mongoose')

// Database connection
mongoose.connect('mongodb://localhost:27017/query-helpers', {
    dbName: 'event_db',
    useNewUrlParser: true,
    useUnifiedTopology: true
}, err => err ? console.log(err) :
    console.log('Connected to database'));

const personSchema = new mongoose.Schema({
    n: {
        type: String,

        // Now accessing `name` will get you the
        // value of `n`, and setting `name`
        // will set the value of `n`
        alias: 'name'
    }
});

const Person = mongoose.model('Person', personSchema);
const person = new Person({ name: 'Val' });
console.log(person);

Step to Run Application: Run the application using the following command from the root directory of the project:

node main.js

Output: 

Example 2: In this example, we will create “first” and “last” aliases for the properties “f” and “l”, respectively, in the mongoose schema. 

Filename: main.js

Javascript

const mongoose = require('mongoose')

// Database connection
mongoose.connect('mongodb://localhost:27017/query-helpers', {
    dbName: 'event_db',
    useNewUrlParser: true,
    useUnifiedTopology: true
}, err => err ? console.log(err) :
    console.log('Connected to database'));

const personSchema = new mongoose.Schema({
    f: {
        type: String,
        alias: 'first'
    },
    l: {
        type: String,
        alias: 'last'
    }
});

const Person = mongoose.model('Person', personSchema);
const person = new Person({ first: 'Hello', last: 'World' });
console.log(person);

Step to Run Application: Run the application using the following command from the root directory of the project:

node main.js

Output:

Reference: https://mongoosejs.com/docs/guide.html#aliases