mongoose save vs insert vs create

What are different ways to insert a document(record) into MongoDB using Mongoose?

My current attempt:

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var notificationsSchema = mongoose.Schema({
	"datetime" : {
        type: Date,
        default: Date.now
    },
    "ownerId":{
        type:String
    },
    "customerId" : {
        type:String
    },
    "title" : {
        type:String
    },
    "message" : {
        type:String
    }
});
 
var notifications = module.exports = mongoose.model('notifications', notificationsSchema);

module.exports.saveNotification = function(notificationObj, callback){
    //notifications.insert(notificationObj); won't work
    //notifications.save(notificationObj); won't work
    notifications.create(notificationObj); //work but created duplicated document
}

Any idea why insert and save doesn't work in my case? I tried create, it inserted 2 document instead of 1. That's strange.

The .save() is an instance method of the model, while the .create() is called directly from the Model as a method call, being static in nature, and takes the object as a first parameter.

var mongoose = require('mongoose');

var notificationSchema = mongoose.Schema({
    "datetime" : {
        type: Date,
        default: Date.now
    },
    "ownerId":{
        type:String
    },
    "customerId" : {
        type:String
    },
    "title" : {
        type:String
    },
    "message" : {
        type:String
    }
});

var Notification = mongoose.model('Notification', notificationsSchema);


function saveNotification1(data) {
    var notification = new Notification(data);
    notification.save(function (err) {
        if (err) return handleError(err);
        // saved!
    })
}

function saveNotification2(data) {
    Notification.create(data, function (err, small) {
    if (err) return handleError(err);
    // saved!
    })
}

Export whatever functions you would want outside.

More at the Mongoose Docs, or consider reading the reference of the Model prototype in Mongoose.

You can either use save() or create().

save() can only be used on a new document of the model while create() can be used on the model. Below, I have given a simple example.

Tour Model

const mongoose = require("mongoose");

const tourSchema = new mongoose.Schema({
  name: {
    type: String,
    required: [true, "A tour must have a name"],
    unique: true,
  },
  rating: {
    type: Number,
    default:3.0,
  },
  price: {
    type: Number,
    required: [true, "A tour must have a price"],
  },
});

const Tour = mongoose.model("Tour", tourSchema);

module.exports = Tour;

Tour Controller

const Tour = require('../models/tourModel');

exports.createTour = async (req, res) => {
  // method 1
  const newTour = await Tour.create(req.body);

  // method 2
  const newTour = new Tour(req.body);
  await newTour.save();
}

Make sure to use either Method 1 or Method 2.