How can you remove all documents from a collection with Mongoose?

I know how to...

• Remove a single document.
• Remove the collection itself.
• Remove all documents from the collection with Mongo.

But I don't know how to remove all documents from the collection with Mongoose. I want to do this when the user clicks a button. I assume that I need to send an AJAX request to some endpoint and have the endpoint do the removal, but I don't know how to handle the removal at the endpoint.

In my example, I have a Datetime collection, and I want to remove all of the documents when the user clicks a button.

api/datetime/index.js

'use strict';

var express = require('express');
var controller = require('./datetime.controller');

var router = express.Router();

router.get('/', controller.index);
router.get('/:id', controller.show);
router.post('/', controller.create);
router.put('/:id', controller.update);
router.patch('/:id', controller.update);
router.delete('/:id', controller.destroy);

module.exports = router;

api/datetime/datetime.controller.js

'use strict';

var _ = require('lodash');
var Datetime = require('./datetime.model');

// Get list of datetimes
exports.index = function(req, res) {
  Datetime.find(function (err, datetimes) {
    if(err) { return handleError(res, err); }
    return res.json(200, datetimes);
  });
};

// Get a single datetime
exports.show = function(req, res) {
  Datetime.findById(req.params.id, function (err, datetime) {
    if(err) { return handleError(res, err); }
    if(!datetime) { return res.send(404); }
    return res.json(datetime);
  });
};

// Creates a new datetime in the DB.
exports.create = function(req, res) {
  Datetime.create(req.body, function(err, datetime) {
    if(err) { return handleError(res, err); }
    return res.json(201, datetime);
  });
};

// Updates an existing datetime in the DB.
exports.update = function(req, res) {
  if(req.body._id) { delete req.body._id; }
  Datetime.findById(req.params.id, function (err, datetime) {
    if (err) { return handleError(res, err); }
    if(!datetime) { return res.send(404); }
    var updated = _.merge(datetime, req.body);
    updated.save(function (err) {
      if (err) { return handleError(res, err); }
      return res.json(200, datetime);
    });
  });
};

// Deletes a datetime from the DB.
exports.destroy = function(req, res) {
  Datetime.findById(req.params.id, function (err, datetime) {
    if(err) { return handleError(res, err); }
    if(!datetime) { return res.send(404); }
    datetime.remove(function(err) {
      if(err) { return handleError(res, err); }
      return res.send(204);
    });
  });
};

function handleError(res, err) {
  return res.send(500, err);
}

DateTime.remove({}, callback) The empty object will match all of them.

.remove() is deprecated. instead we can use deleteMany

DateTime.deleteMany({}, callback).

In MongoDB, the db.collection.remove() method removes documents from a collection. You can remove all documents from a collection, remove all documents that match a condition, or limit the operation to remove just a single document.

Source: Mongodb.

If you are using mongo sheel, just do:

db.Datetime.remove({})

In your case, you need:

You didn't show me the delete button, so this button is just an example:

<a class="button__delete"></a>

Change the controller to:

exports.destroy = function(req, res, next) {
	Datetime.remove({}, function(err) {
			if (err) {
				console.log(err)
			} else {
				res.end('success');
			}
		}
	);
};

Insert this ajax delete method in your client js file:

		$(document).ready(function(){
			$('.button__delete').click(function() {
				var dataId = $(this).attr('data-id');

				if (confirm("are u sure?")) {
					$.ajax({
						type: 'DELETE',
						url: '/',
						success: function(response) {
							if (response == 'error') {
								console.log('Err!');
							}
							else {
								alert('Success');
								location.reload();
							}
						}
					});
				} else {
					alert('Canceled!');
				}
			});
		});

MongoDB shell version v4.2.6
Node v14.2.0

Assuming you have a Tour Model: tourModel.js

const mongoose = require('mongoose');

const tourSchema = new mongoose.Schema({
  name: {
    type: String,
    required: [true, 'A tour must have a name'],
    unique: true,
    trim: true,
  },
  createdAt: {
    type: Date,
    default: Date.now(),
  },
});
const Tour = mongoose.model('Tour', tourSchema);

module.exports = Tour;

Now you want to delete all tours at once from your MongoDB, I also providing connection code to connect with the remote cluster. I used deleteMany(), if you do not pass any args to deleteMany(), then it will delete all the documents in Tour collection.

const mongoose = require('mongoose');
const Tour = require('./../../models/tourModel');
const conStr = 'mongodb+srv://lord:<PASSWORD>@cluster0-eeev8.mongodb.net/tour-guide?retryWrites=true&w=majority';
const DB = conStr.replace('<PASSWORD>','ADUSsaZEKESKZX');
mongoose.connect(DB, {
    useNewUrlParser: true,
    useCreateIndex: true,
    useFindAndModify: false,
    useUnifiedTopology: true,
  })
  .then((con) => {
    console.log(`DB connection successful ${con.path}`);
  });

const deleteAllData = async () => {
  try {
    await Tour.deleteMany();
    console.log('All Data successfully deleted');
  } catch (err) {
    console.log(err);
  }
};

Your_Mongoose_Model.deleteMany({}) can do the job

References:
https://mongoosejs.com/docs/api.html#query_Query-deleteMany https://www.geeksforgeeks.org/mongoose-deletemany-function/