Model_Name.discriminators

npm init

npm install mongoose

// Require mongoose module 
const mongoose = require('mongoose'); 
  
// Set Up the Database connection 
mongoose.connect( 
    'mongodb://localhost:27017/geeksforgeeks', { 
    useNewUrlParser: true, 
    useUnifiedTopology: true
}) 
  
const userSchema = new mongoose.Schema( 
    { name: String, age: Number } 
) 
  
// Defining userSchema model 
const User = mongoose.model('User', userSchema); 
  
// Setting the discriminator 
const ClickedLinkEvent = User.discriminator('ClickedLink', 
  new mongoose.Schema({ url: String })); 
  
// Getting the discriminator 
const output = User.discriminators 
console.log("Discriminators is", output)

node app.js

Discriminators is { ClickedLink: Model { ClickedLink } }

// Require mongoose module 
const mongoose = require('mongoose'); 
  
// Set Up the Database connection 
mongoose.connect( 
'mongodb://localhost:27017/geeksforgeeks', { 
    useNewUrlParser: true, 
    useUnifiedTopology: true
}) 
  
const studentSchema = new mongoose.Schema({  
    name: String,  
    father_name: String,  
    mother_name: String  
}) 
  
// Defining studentSchema model 
const Student = mongoose.model('Student', studentSchema); 
  
// Setting the Discriminators 
const ParentEvent = Student.discriminator( 
    'Parent', 
      new mongoose.Schema({ parentName: String }) 
); 
    
// Getting the Discriminators 
const output = Student.discriminators 
console.log("Discriminators is:", output)

node app.js

Discriminators is: { Parent: Model { Parent } }